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System.Diagnostics.Process current = System.Diagnostics.Process.GetCurrentProcess();
DateTime startedTime = current.StartTime;

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    enum ProgrammingLanguage
    {
        Language_First = 0,
        CPP = 1,
        CSharp = 2,
        Java =3,
        Language_Last = 4,
    }
    class Program
    {

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        private void Tree_BeforeSelect(object sender, TreeViewCancelEventArgs e)
        {
            e.Cancel = IsTreeNodeSelectable(e.Node);
        }

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    class C<T> {}

    internal class D
    {
        public static C<U> M<U>(C<bool> c)
        {
            // Fail compiling: 
            // return (C<U>)c;
            // Pass compiling, exception in runtime: 
            // return X.Cast<C<U>>(c);

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Regex regex = new Regex(@"app");
bool found = false;
foreach (var process in Process.GetProcesses())
{
    if (regex.Match(process.ProcessName).Success)
    {
        found = true;
        break;
    }

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            Console.WriteLine("CurrentCulture: " + StringComparison.CurrentCulture);
            Console.WriteLine("InvariantCulture: " + StringComparison.InvariantCulture);
            Console.WriteLine("Ordinal: " + StringComparison.Ordinal);
            Console.WriteLine();

            const string softhyphen = "\xAD";
            const string hyphen = "\x2D";
            const string softHyphenPlusHyphen = "\xAD\x2D";
            const string hyphenPlusSoftHyphen = "\x2D\xAD";

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Console.WriteLine(System.AppDomain.CurrentDomain.BaseDirectory);
Console.WriteLine(System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName));

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public static IEnumerable<Type> GetAssemblyTypes(string filePath)
{
    Assembly assembly =
        Assembly.LoadFile(filePath);

    IEnumerable<Type> types;
    try
    {
        types = assembly.GetTypes();
    }

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public  static class Extention
{
    public static bool IsAbstrct(this Type type)
    {
        return type.IsAbstract;
    }

    public static bool IsEnumerableType(this Type t)
    {
        return typeof(IEnumerable<string>).IsAssignableFrom(t);

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System.Windows.SystemParameters.PrimaryScreenWidth
System.Windows.SystemParameters.PrimaryScreenHeigth