C# Language Tutorial => Integer overflow

Example

There is a maximum capacity an integer can store. And when you go over that limit, it will loop back to the negative side. For int, it is 2147483647

int x = int.MaxValue;                //MaxValue is 2147483647
x = unchecked(x + 1);                //make operation explicitly unchecked so that the example also works when the check for arithmetic overflow/underflow is enabled in the project settings 
Console.WriteLine(x);                //Will print -2147483648
Console.WriteLine(int.MinValue);     //Same as Min value

For any integers out of this range use namespace System.Numerics which has datatype BigInteger. Check below link for more information https://msdn.microsoft.com/en-us/library/system.numerics.biginteger(v=vs.110).aspx

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