Get client bounds of another process running on the same system.

ClientBounds.cs

using System.Diagnostics;
using System.Drawing;
using System.Runtime.InteropServices;

namespace ClientExtensions
{
    public static class ClientBounds
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern IntPtr FindWindow(string strClassName, string strWindowName);

        [DllImport("user32.dll")]
        private static extern bool GetWindowRect(IntPtr hwnd, ref Rect rectangle);

        private struct Rect
        {
            public int Left { get; set; }
            public int Top { get; set; }
            public int Right { get; set; }
            public int Bottom { get; set; }
        }

        public static Rectangle Get(string _ProcessName)
        {
            //NAME WITHOUT .EXE EXTENSION
            Process[] Processes = Process.GetProcessesByName(_ProcessName);
            if (Processes.Length > 0)
            {
                Process HookProcess = Processes[0];
                IntPtr ProcessPtr = HookProcess.MainWindowHandle;
                Rect ProcessRect = new Rect();
                GetWindowRect(ProcessPtr, ref ProcessRect);

                Rectangle DClientBounds = new Rectangle(
                    ProcessRect.Left, ProcessRect.Top, ProcessRect.Right - ProcessRect.Left,
                    ProcessRect.Bottom - ProcessRect.Top);

                return DClientBounds;
            }
            else
            {
                throw new InvalidProgramException("A program with the name " + _ProcessName
                    + " is not currently running on this device.");
            }
        }
    }
}