Multiplying int with long result c#

Question

Wonder why. C# .Net 3.5

int a = 256 * 1024 * 1024;
int b = 8;
long c = b * a;
Console.WriteLine(c);//<-- result is -2147483648 

Where do

Answer 1

Because b * a is already overflowed integer, before it is assigned to the long data type variable.