C#

[DllImport("user32.dll", EntryPoint="SystemParametersInfo", SetLastError=true)]
static extern bool SetSystemParametersInfo(uint uiAction, uint uiParam,
  bool pvParam, uint fWinIni);
 
[DllImport("user32.dll", EntryPoint="SystemParametersInfo", SetLastError=true)]
static extern bool GetSystemParametersInfo(uint uiAction, uint uiParam,
  out bool pvParam, uint fWinIni);
 
const uint SPI_GETKEYBOARDCUES = 0x100a;
const uint SPI_SETKEYBOARDCUES = 0x100b;
const uint SPIF_UPDATEINIFILE  = 0x0001;
const uint SPIF_SENDCHANGE     = 0x0002;
 
public static bool KeyboardCues
{
  get
  {
    bool value = false;
    if (!GetSystemParametersInfo(SPI_GETKEYBOARDCUES, 0, out value,
      SPIF_UPDATEINIFILE | SPIF_SENDCHANGE))
      throw new Win32Exception(); // GetLastError()
 
    return value;
  }
  set
  {
    if (!SetSystemParametersInfo(SPI_SETKEYBOARDCUES, 0, value,
      SPIF_UPDATEINIFILE | SPIF_SENDCHANGE))
      throw new Win32Exception(); // GetLastError()
  }
}

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public class MyFirstClass
{
  public static void Main()
  {
    for (int i=0; i<100; i++)
      Console.WriteLine("I will come back to the forum when I learned to ask meaningful questions.");
  }
}

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Application.DoEvents()     // Gives your app's time to react to following events in the message queue.