//this function calculates the number of two sixes in a row
private void CountNumber(Roll d, EventArgs e)
{
num++;
Console.WriteLine("two Sixes in a row: ");
}
//this function is called when sum of the numbers of last 5 throws is >= 20
private void GreaterEqual20(Roll d, EventArgs e)
{
Console.WriteLine("Sum of last 5 tosses is greater than or equal to 20");
}