Client.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace GameServer {
    class Client {
        public string ID {
            get;
            private set;
        }

        public IPEndPoint EndPoint {
            get;
            private set;
        }

        Socket sck;

        public Client(Socket accepted)
        {
            sck = accepted;
            ID = Guid.NewGuid().ToString();
            EndPoint = (IPEndPoint)sck.RemoteEndPoint;
            sck.BeginReceive(new byte[] { 0 }, 0, 0, 0, callback, null);
        }

        void callback( IAsyncResult ar ) {
            try {
                sck.EndReceive( ar );

                byte[] buf = new byte[8192];
                int rec = sck.Receive( buf, buf.Length, 0 );

                if( rec < buf.Length ) {
                    Array.Resize<byte>( ref buf, rec );
                }

                if( Received != null ) {
                    Received( this, buf );
                }

                sck.BeginReceive( new byte[] { 0 }, 0, 0, 0, callback, null );
            } catch( Exception ex ) {
                MessageBox.Show( "client - " + ex.Message );
                Close();

                if( Disconnected != null ) {
                    Disconnected( this );
                }
            }
        }

        public void Close() {
            sck.Close();
        }

        public delegate void ClientReceivedHandler( Client sender, byte[] data );
        public delegate void ClientDisconnectedHandler( Client sender );

        public event ClientReceivedHandler Received;
        public event ClientDisconnectedHandler Disconnected;
    }
}

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;


namespace GameServer {
    public partial class Form1 : Form {

        // ### MAIN
        public bool serverRunning = false;
        public int serverListenPort = 6666;

        static Listener l;

        public Form1() {
            InitializeComponent();

            l = new Listener( serverListenPort );
            l.SocketAccepted += new Listener.SocketAcceptedHandler( l_SocketAccepted );
        }
        
        // Events
        void l_SocketAccepted( Socket e ) {
            Client client = new Client( e );
            client.Received += new Client.ClientReceivedHandler( client_Received );
            client.Disconnected += new Client.ClientDisconnectedHandler( client_Disconnected );

            Invoke( ( MethodInvoker )delegate {
                dataGridViewConnections.Rows.Add( client.ID, client.EndPoint.ToString() );
                consoleWrite( DateTime.Now + " - " + client.EndPoint + " connected to server.\n\n", Color.Lime );
            } );
        }

        void client_Received(Client sender, byte[] data)
        {
            if (Encoding.Default.GetString(data) != "")
            {
                Invoke((MethodInvoker)delegate
                {
                    consoleWrite(DateTime.Now + "-" + sender.EndPoint + " :\n" + Encoding.Default.GetString(data) + "\n\n", Color.White); ;
                });
            }
        }

        void client_Disconnected( Client sender ) {
            Invoke( ( MethodInvoker )delegate {
                for( int i = 0; i < dataGridViewConnections.Rows.Count; i++ ) {
                    if( dataGridViewConnections.Rows[i].Cells[0].Value.ToString() == sender.ID.ToString() ) {
                        dataGridViewConnections.Rows.RemoveAt( i );
                        consoleWrite( DateTime.Now + " - " + sender.EndPoint + " disconnected from server.\n\n", Color.OrangeRed );
                        break;
                    }
                }
            } );
        }

        private void Form1_Load( object sender, EventArgs e ) {
            textBoxIP.Text = getExternalIP();
        }

        private void checkBox1_Click(object sender, EventArgs e) {
            checkBox1.Enabled = false;
            if( !serverRunning ) {
                consoleWrite( DateTime.Now + " " + markerSystem + "start\n", Color.White );
                ServerStart();
                checkBox1.Text = "Stop";
            } else {
                consoleWrite( DateTime.Now + " " + markerSystem + "stop\n", Color.White );
                ServerStop();
                checkBox1.Text = "Start";
            }
            checkBox1.Enabled = true;
        }

        // Functions
        private string getExternalIP() {
            System.Net.WebClient client = new System.Net.WebClient();
            string ip = client.DownloadString("http://checkip.dyndns.com/");
            int start = ip.IndexOf("Address: ") + 9;
            int end = ip.LastIndexOf("</body>");
            ip = ip.Substring( start, end - start );
            return ip;
        }

        private void ServerStart() {
            if( !serverRunning ) {
                consoleWrite( "* Starting server . . .\n", Color.Orange );
                // Start Server
                l.Start();
                serverRunning = true;
                consoleWrite( "* Server started !\n", Color.Lime );
                consoleWrite("Listening on port " + serverListenPort + ".\n\n", Color.White );
            } else {
                consoleWrite( "* ERROR: Server already started !\n\n", Color.Red );
            }
        }

        private void ServerStop()
        {
            if (serverRunning)
            {
                consoleWrite("* Stopping server . . .\n", Color.Orange);
                // Stop Server
                l.Stop();

                serverRunning = false;
                consoleWrite("* Server stopped !\n\n", Color.Lime);
                dataGridViewConnections.Rows.Clear(); // Clear connections

            }
            else
            {
                consoleWrite("* ERROR: Server already stopped !\n\n", Color.Red);
            }
        }

        // ### CONSOLE
        private string markerSystem = "@System -> ";
        private string marker = "-> ";

        // Events
        private void consoleText_TextChanged(object sender, EventArgs e) {
            consoleText.SelectionStart = consoleText.Text.Length;
            consoleText.ScrollToCaret();
        }

        private void consoleInput_KeyPress(object sender, KeyPressEventArgs e) {
            if( e.KeyChar == (char)Keys.Enter && consoleInput.Text.Trim() != "" ) {
                string[] input = consoleInput.Text.Trim().ToLower().Split(' ');
                consoleInput.Text = "";
                string cmd = input[0];
                consoleWrite( DateTime.Now + " " + marker + String.Join(" ", input) + "\n", Color.White );
                // CMD - HELP
                if( cmd == "help" || cmd == "?" ) {
                    if( input.Length == 1 ) {
                        consoleWrite( "---------------------------------------------\n", Color.Cyan );
                        consoleWrite( " help | ? - Displays this list of commands\n", Color.Cyan );
                        consoleWrite( " start    - Starts the server\n", Color.Cyan );
                        consoleWrite( " stop     - Stops the server\n", Color.Cyan );
                        consoleWrite( "---------------------------------------------\n\n", Color.Cyan );
                    } else {
                        consoleWrite( "Invalid parameter \"" + input[1] + "\"\n\n", Color.Gray );
                    }
                // CMD - START
                } else if( cmd == "start" ) {
                    if( input.Length == 1 ) {
                        ServerStart();
                        checkBox1.Checked = true;
                        checkBox1.Text = "Stop";
                    } else {
                        consoleWrite( "Invalid parameter \"" + input[1] + "\"\n\n", Color.Gray );
                    }
                // CMD - STOP
                } else if( cmd == "stop" ) {
                    if( input.Length == 1 ) {
                        ServerStop();
                        checkBox1.Checked = false;
                        checkBox1.Text = "Start";
                    } else {
                        consoleWrite( "Invalid parameter \"" + input[1] + "\"\n\n", Color.Gray );
                    }
                // CMD - TEST
                } else if( cmd == "test" ) {
                    int blabla;
                    if( input.Length == 3 ) {
                        if( Int32.TryParse( input[1], out blabla ) ) {
                            if( Int32.TryParse( input[2], out blabla ) ) {
                                for( int i = Int32.Parse( input[1] ); i <= Int32.Parse( input[2] ); i++ ) {
                                    consoleWrite( i + "\n", Color.Cyan );
                                }
                            } else {
                                // 2 invalid
                            }
                        } else {
                            // par 1 invalid
                        }
                    } else {
                        consoleWrite( "\"" + cmd + "\" needs two parameters\n\n", Color.Gray );
                    }
                // CMD - <INVALID>
                } else {
                    consoleWrite( "Invalid command \"" + cmd + "\"\n\n", Color.Gray );
                }
                e.Handled = true;
            }
        }

        // Functions
        private void consoleWrite( string text, Color color ) {
            consoleText.SelectionStart = consoleText.Text.Length;
            consoleText.SelectionLength = 0;
            consoleText.SelectionColor = color;
            consoleText.AppendText( text );
        }
    }
}

Form1.designer.cs

namespace GameServer {
    partial class Form1 {
        /// <summary>
        /// Erforderliche Designervariable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Verwendete Ressourcen bereinigen.
        /// </summary>
        /// <param name="disposing">True, wenn verwaltete Ressourcen gelöscht werden sollen; andernfalls False.</param>
        protected override void Dispose(bool disposing) {
            if (disposing && (components != null)) {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Vom Windows Form-Designer generierter Code

        /// <summary>
        /// Erforderliche Methode für die Designerunterstützung.
        /// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert werden.
        /// </summary>
        private void InitializeComponent() {
            this.tabPages = new System.Windows.Forms.TabControl();
            this.tabPageConsole = new System.Windows.Forms.TabPage();
            this.consoleInput = new System.Windows.Forms.TextBox();
            this.consoleText = new System.Windows.Forms.RichTextBox();
            this.tabPageConnections = new System.Windows.Forms.TabPage();
            this.button6 = new System.Windows.Forms.Button();
            this.button5 = new System.Windows.Forms.Button();
            this.button4 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.button1 = new System.Windows.Forms.Button();
            this.dataGridViewConnections = new System.Windows.Forms.DataGridView();
            this.checkBox1 = new System.Windows.Forms.CheckBox();
            this.label1 = new System.Windows.Forms.Label();
            this.textBoxIP = new System.Windows.Forms.TextBox();
            this.Column1 = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.Column2 = new System.Windows.Forms.DataGridViewTextBoxColumn();
            this.tabPages.SuspendLayout();
            this.tabPageConsole.SuspendLayout();
            this.tabPageConnections.SuspendLayout();
            ( ( System.ComponentModel.ISupportInitialize )( this.dataGridViewConnections ) ).BeginInit();
            this.SuspendLayout();
            // 
            // tabPages
            // 
            this.tabPages.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( ( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom )
                        | System.Windows.Forms.AnchorStyles.Left )
                        | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.tabPages.Controls.Add( this.tabPageConsole );
            this.tabPages.Controls.Add( this.tabPageConnections );
            this.tabPages.Location = new System.Drawing.Point( 12, 42 );
            this.tabPages.Name = "tabPages";
            this.tabPages.SelectedIndex = 0;
            this.tabPages.Size = new System.Drawing.Size( 760, 508 );
            this.tabPages.TabIndex = 3;
            // 
            // tabPageConsole
            // 
            this.tabPageConsole.BackColor = System.Drawing.Color.Black;
            this.tabPageConsole.Controls.Add( this.consoleInput );
            this.tabPageConsole.Controls.Add( this.consoleText );
            this.tabPageConsole.Location = new System.Drawing.Point( 4, 22 );
            this.tabPageConsole.Name = "tabPageConsole";
            this.tabPageConsole.Padding = new System.Windows.Forms.Padding( 3 );
            this.tabPageConsole.Size = new System.Drawing.Size( 752, 482 );
            this.tabPageConsole.TabIndex = 0;
            this.tabPageConsole.Text = "Console";
            // 
            // consoleInput
            // 
            this.consoleInput.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( ( System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left )
                        | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.consoleInput.BackColor = System.Drawing.Color.Black;
            this.consoleInput.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.consoleInput.Font = new System.Drawing.Font( "Courier New", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ( ( byte )( 0 ) ) );
            this.consoleInput.ForeColor = System.Drawing.Color.White;
            this.consoleInput.Location = new System.Drawing.Point( 6, 456 );
            this.consoleInput.Name = "consoleInput";
            this.consoleInput.Size = new System.Drawing.Size( 740, 20 );
            this.consoleInput.TabIndex = 5;
            this.consoleInput.KeyPress += new System.Windows.Forms.KeyPressEventHandler( this.consoleInput_KeyPress );
            // 
            // consoleText
            // 
            this.consoleText.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( ( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom )
                        | System.Windows.Forms.AnchorStyles.Left )
                        | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.consoleText.AutoWordSelection = true;
            this.consoleText.BackColor = System.Drawing.Color.Black;
            this.consoleText.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.consoleText.Font = new System.Drawing.Font( "Courier New", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ( ( byte )( 0 ) ) );
            this.consoleText.ForeColor = System.Drawing.Color.White;
            this.consoleText.Location = new System.Drawing.Point( 6, 6 );
            this.consoleText.Name = "consoleText";
            this.consoleText.ReadOnly = true;
            this.consoleText.Size = new System.Drawing.Size( 740, 444 );
            this.consoleText.TabIndex = 4;
            this.consoleText.Text = "";
            this.consoleText.WordWrap = false;
            this.consoleText.TextChanged += new System.EventHandler( this.consoleText_TextChanged );
            // 
            // tabPageConnections
            // 
            this.tabPageConnections.Controls.Add( this.button6 );
            this.tabPageConnections.Controls.Add( this.button5 );
            this.tabPageConnections.Controls.Add( this.button4 );
            this.tabPageConnections.Controls.Add( this.button3 );
            this.tabPageConnections.Controls.Add( this.button2 );
            this.tabPageConnections.Controls.Add( this.button1 );
            this.tabPageConnections.Controls.Add( this.dataGridViewConnections );
            this.tabPageConnections.Location = new System.Drawing.Point( 4, 22 );
            this.tabPageConnections.Name = "tabPageConnections";
            this.tabPageConnections.Padding = new System.Windows.Forms.Padding( 3 );
            this.tabPageConnections.Size = new System.Drawing.Size( 752, 482 );
            this.tabPageConnections.TabIndex = 1;
            this.tabPageConnections.Text = "Connections";
            this.tabPageConnections.UseVisualStyleBackColor = true;
            // 
            // button6
            // 
            this.button6.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.button6.Location = new System.Drawing.Point( 596, 151 );
            this.button6.Name = "button6";
            this.button6.Size = new System.Drawing.Size( 150, 23 );
            this.button6.TabIndex = 10;
            this.button6.Text = "button1";
            this.button6.UseVisualStyleBackColor = true;
            // 
            // button5
            // 
            this.button5.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.button5.Location = new System.Drawing.Point( 596, 122 );
            this.button5.Name = "button5";
            this.button5.Size = new System.Drawing.Size( 150, 23 );
            this.button5.TabIndex = 9;
            this.button5.Text = "button1";
            this.button5.UseVisualStyleBackColor = true;
            // 
            // button4
            // 
            this.button4.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.button4.Location = new System.Drawing.Point( 596, 93 );
            this.button4.Name = "button4";
            this.button4.Size = new System.Drawing.Size( 150, 23 );
            this.button4.TabIndex = 8;
            this.button4.Text = "button1";
            this.button4.UseVisualStyleBackColor = true;
            // 
            // button3
            // 
            this.button3.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.button3.Location = new System.Drawing.Point( 596, 64 );
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size( 150, 23 );
            this.button3.TabIndex = 7;
            this.button3.Text = "button1";
            this.button3.UseVisualStyleBackColor = true;
            // 
            // button2
            // 
            this.button2.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.button2.Location = new System.Drawing.Point( 596, 35 );
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size( 150, 23 );
            this.button2.TabIndex = 6;
            this.button2.Text = "button1";
            this.button2.UseVisualStyleBackColor = true;
            // 
            // button1
            // 
            this.button1.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.button1.Location = new System.Drawing.Point( 596, 6 );
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size( 150, 23 );
            this.button1.TabIndex = 5;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            // 
            // dataGridViewConnections
            // 
            this.dataGridViewConnections.AllowUserToAddRows = false;
            this.dataGridViewConnections.AllowUserToDeleteRows = false;
            this.dataGridViewConnections.Anchor = ( ( System.Windows.Forms.AnchorStyles )( ( ( ( System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom )
                        | System.Windows.Forms.AnchorStyles.Left )
                        | System.Windows.Forms.AnchorStyles.Right ) ) );
            this.dataGridViewConnections.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridViewConnections.Columns.AddRange( new System.Windows.Forms.DataGridViewColumn[] {
            this.Column1,
            this.Column2} );
            this.dataGridViewConnections.Location = new System.Drawing.Point( 6, 6 );
            this.dataGridViewConnections.Name = "dataGridViewConnections";
            this.dataGridViewConnections.ReadOnly = true;
            this.dataGridViewConnections.Size = new System.Drawing.Size( 584, 470 );
            this.dataGridViewConnections.TabIndex = 4;
            // 
            // checkBox1
            // 
            this.checkBox1.Appearance = System.Windows.Forms.Appearance.Button;
            this.checkBox1.Location = new System.Drawing.Point( 12, 12 );
            this.checkBox1.Name = "checkBox1";
            this.checkBox1.Size = new System.Drawing.Size( 75, 24 );
            this.checkBox1.TabIndex = 0;
            this.checkBox1.Text = "Start";
            this.checkBox1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
            this.checkBox1.UseVisualStyleBackColor = true;
            this.checkBox1.Click += new System.EventHandler( this.checkBox1_Click );
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point( 107, 18 );
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size( 17, 13 );
            this.label1.TabIndex = 4;
            this.label1.Text = "IP";
            // 
            // textBoxIP
            // 
            this.textBoxIP.Location = new System.Drawing.Point( 130, 15 );
            this.textBoxIP.Name = "textBoxIP";
            this.textBoxIP.ReadOnly = true;
            this.textBoxIP.Size = new System.Drawing.Size( 100, 20 );
            this.textBoxIP.TabIndex = 1;
            // 
            // Column1
            // 
            this.Column1.HeaderText = "ID";
            this.Column1.Name = "Column1";
            this.Column1.ReadOnly = true;
            this.Column1.Resizable = System.Windows.Forms.DataGridViewTriState.False;
            // 
            // Column2
            // 
            this.Column2.HeaderText = "IP";
            this.Column2.Name = "Column2";
            this.Column2.ReadOnly = true;
            this.Column2.Resizable = System.Windows.Forms.DataGridViewTriState.False;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF( 6F, 13F );
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size( 784, 562 );
            this.Controls.Add( this.textBoxIP );
            this.Controls.Add( this.label1 );
            this.Controls.Add( this.checkBox1 );
            this.Controls.Add( this.tabPages );
            this.MinimumSize = new System.Drawing.Size( 400, 300 );
            this.Name = "Form1";
            this.ShowIcon = false;
            this.Text = "Game Server";
            this.Load += new System.EventHandler( this.Form1_Load );
            this.tabPages.ResumeLayout( false );
            this.tabPageConsole.ResumeLayout( false );
            this.tabPageConsole.PerformLayout();
            this.tabPageConnections.ResumeLayout( false );
            ( ( System.ComponentModel.ISupportInitialize )( this.dataGridViewConnections ) ).EndInit();
            this.ResumeLayout( false );
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.TabControl tabPages;
        private System.Windows.Forms.TabPage tabPageConsole;
        private System.Windows.Forms.TabPage tabPageConnections;
        private System.Windows.Forms.CheckBox checkBox1;
        private System.Windows.Forms.TextBox consoleInput;
        private System.Windows.Forms.RichTextBox consoleText;
        private System.Windows.Forms.DataGridView dataGridViewConnections;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox textBoxIP;
        private System.Windows.Forms.Button button6;
        private System.Windows.Forms.Button button5;
        private System.Windows.Forms.Button button4;
        private System.Windows.Forms.Button button3;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.DataGridViewTextBoxColumn Column1;
        private System.Windows.Forms.DataGridViewTextBoxColumn Column2;
    }
}

Listener.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace GameServer
{
    class Listener
    {
        Socket s;

        public bool Listening
        {
            get;
            private set;
        }

        public int Port
        {
            get;
            private set;
        }

        public Listener(int port)
        {
            Port = port;
            s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        }

        public void Start()
        {
            if (Listening)
            {
                return;
            }
            // Conect
            s.Bind(new IPEndPoint(0, Port));
            s.Listen(0);
            // End Connect
            
            // Begin recieving packets
            s.BeginAccept(callback, null);
            Listening = true;
        }

        public void Stop()
        {
            if (!Listening)
            {
                return;
            }

            s.Close();
            s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            Listening = false;
        }

        void callback(IAsyncResult ar)
        {

            try
            {

                Socket s = this.s.EndAccept(ar);

                if (SocketAccepted != null)
                {
                    SocketAccepted(s);
                }

                this.s.BeginAccept(callback, null);
            }
            catch (Exception ex)
            {
                if (!ex.Message.Contains("asyncResult"))
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        public delegate void SocketAcceptedHandler(Socket e);
        public event SocketAcceptedHandler SocketAccepted;
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace GameServer {
    static class Program {
        /// <summary>
        /// Der Haupteinstiegspunkt für die Anwendung.
        /// </summary>
        [STAThread]
        static void Main() {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}