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public class CreateFileOrFolder
{
  static void Main()
  {
    // Specify a "currently active folder"
    string activeDir = @"c:\testdir2";

    //Create a new subfolder under the current active folder
    string newPath = System.IO.Path.Combine(activeDir, "mySubDir");

    // Create the subfolder
    System.IO.Directory.CreateDirectory(newPath);

    // Create a new file name. This example generates
    // a random string.
    string newFileName = System.IO.Path.GetRandomFileName();

    // Combine the new file name with the path
    newPath = System.IO.Path.Combine(newPath, newFileName);

    // Create the file and write to it.
    // DANGER: System.IO.File.Create will overwrite the file
    // if it already exists. This can occur even with
    // random file names.
    if (!System.IO.File.Exists(newPath))
    {
      using (System.IO.FileStream fs = System.IO.File.Create(newPath))
      {
        for (byte i = 0; i < 100; i++)
        {
          fs.WriteByte(i);
        }
      }
    }

    // Read data back from the file to prove
    // that the previous code worked.
    try
    {
      byte[] readBuffer = System.IO.File.ReadAllBytes(newPath);
      foreach (byte b in readBuffer)
      {
        Console.WriteLine(b);
      }
    }
    catch (System.IO.IOException e)
    {
      Console.WriteLine(e.Message);
    }

    // Keep the console window open in debug mode.
    System.Console.WriteLine("Press any key to exit.");
    System.Console.ReadKey();
  }
}