Program:

The source code to demonstrate the use of BigMul() method of Math class is given below. The given program is compiled and executed successfully.

using System;

class Sample
{
    //Entry point of Program
    static public void Main()
    {
        int IntVal1 = 0;
        int IntVal2 = 0;
        long BigMultResult=0;
        long SimpleMultResult = 0;

        IntVal1 = Int32.MaxValue;
        IntVal2 = Int32.MaxValue;

        SimpleMultResult = IntVal1 * IntVal1;
        BigMultResult = Math.BigMul(IntVal1, IntVal2);

        Console.WriteLine("Result of Simple product of MaxValues: " + SimpleMultResult);  
        Console.WriteLine("Result of product of MaxValues using BigMul(): " + BigMultResult);  
    }
}

Output:

Result of Simple product of MaxValues: 1
Result of product of MaxValues using BigMul(): 4611686014132420609
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