C#

try {
    Convert.ToInt32(myTextBox.Text);
} 
catch 
{
    // the text in the control is not a number
    MessageBox.Show("Invalid Entry", "Error!");
}

protected override void WndProc(ref Message m)
{
	if(m.Msg == 0x112) // if WM_SYSCOMMAND 
	{
		if(m.WParam.ToInt32() == 0xf020) //if SC_MINIMIZE
		{
                        // process here what you want
			return; // if you want to not to minimize, or call base.WndProc (ref m) if you do not
		}
	}

	base.WndProc (ref m);
}

static void Mehtod(int[,] alfaArgument) 
{
	Console.WriteLine("Argument values : " + 
		alfaArgument[0,0] + ", " +
		alfaArgument[0,1] + ", " +
		alfaArgument[0,2] + ", " +
		alfaArgument[1,0] + ", " +
		alfaArgument[1,1] + ", " +
		alfaArgument[1,2]);
}

static void Mehtod(int[,/*,,,,,,,...*/] alfaArgument) 
{
   long[] indexes = new long[alfaArgument.Rank];

   for(long i = 0 ; i < indexes.LongLength ; i++)
       indexes[i] = 0;

   while(true)
   {
       string argument = "";
				
       for(long i = 0 ; i < indexes.LongLength ; i++)
           argument += indexes[i] + ", ";
       argument = argument.Substring(0, argument.Length-2);

       Console.WriteLine("alfaArgument["+argument+"] = " +     alfaArgument.GetValue(indexes));

       indexes[alfaArgument.Rank-1] ++;
       for(long i = indexes.LongLength-1 ; i > -1  ; i--) // for correct listing
       {
           if(indexes[i] >= alfaArgument.GetLongLength((int)i)) 
	   {
		indexes[i] = 0;
		if (i > 0)
			indexes[i-1] ++;
		else
			return;
	   }
       }
}

void SayHello(string message)
{
}

void SayHello(string message, bool waveHandAsFriendlyGesture)
{
}

theType.GetMethod("SayHello"); // ambiguous match exception: both SayHello methods take at least a string.

theType.GetMethod("SayHello", new Type[] { typeof(string), typeof(bool) }); // yay, no exceptions!