How do I sum even numbers between two numbers

MSDN wrote:

C#

public void Linq65()
{
    var numbers =
        from n in Enumerable.Range(100, 50)

        select new { Number = n, OddEven = n % 2 == 1 ? "odd" : "even" };

    foreach (var n in numbers)
    {
        Console.WriteLine("The number {0} is {1}.", n.Number, n.OddEven);
    }
}

This sample uses Range to generate a sequence of numbers from 100 to 149 that is used to find which numbers in that range are odd and even.

The number 100 is even.
The number 101 is odd.
The number 102 is even.
The number 103 is odd.
The number 104 is even.
The number 105 is odd.
The number 106 is even.
...
The number 149 is odd.

int fromNumber = 10;
int toNumber = 30;
//1. querable method
var SumOfEvenNumbersInRange = (from n in Enumerable.Range(fromNumber, toNumber - fromNumber +1)
        where(n%2==0)
        select n).Sum();
//2. Lambda expressions
int res = Enumerable.Range(fromNumber, toNumber - fromNumber +1).Where(n=>n%2==0).Sum();