The => operator designates a Lambda Expression:
A lambda expression is an anonymous function that can contain expressions and statements, and can be used to create delegates or expression tree types.
All lambda expressions use the lambda operator =>, which is read as "goes to". The left side of the lambda operator specifies the input parameters (if any) and the right side holds the expression or statement block. The lambda expression x => x * x is read "x goes to x times x." This expression can be assigned to a delegate type as follows:
static void Main(string[] args)
{
Func<int, int> func = x => x * x;
int j = func(5);
// j == 25
}
