System.Math provides the BigMul method for cases where you have to find the product of two large integer numerals that may result in a value that would cause an System.Overflow Exception. The BigMul method returns a long number, which avoids the overflow.

System.Int32 i = 245525352;System.Int32 j = 245552352;System.Int32 k = 0;//This one will workvar result = System.Math.BigMul(i, j);//This one will throw Arithmetic overflow exceptionk = i * j;