how to join two Lists in linq

i have two List A,B which consists integer values ,list A contains 40 to 1 list B contains 40 to 79 i like to both values except 40 and st开发者_JAVA百科ore it in another list using Linq.The resultant list like this {80,80...}. how can i do this? Is it possible to do this?

It sounds like you're trying to "join" these in a pairwise fashion by index: the first element from each list, then the second element etc. That suggests you want Zip, which was introduced in .NET 4:

var zipped = list1.Zip(list2, (x1, x2) => x1 + x2);

If you're using .NET 3.5, you can use a separate implementation of the same method, such as the one in MoreLINQ.

EDIT: Alternatively, Eric Lippert posted some source code for Zip a while ago, too.

Check out the IEnumerable<T>.Join() method.

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        // Two source arrays.
        var array1 = new int[] { 1, 2, 3, 4, 5 };
        var array2 = new int[] { 6, 7, 8, 9, 10 };

        // Add elements at each position together.
        var zip = array1.Zip(array2, (a, b) => (a + b));

        // Look at results.
        foreach (var value in zip)
        {
            Console.WriteLine(value);
        }
    }
}

--- Output of the program ---

7 9 11 13 15

Try Joining them together

http://weblogs.asp.net/rajbk/archive/2010/03/12/joins-in-linq-to-sql.aspx

http://msdn.microsoft.com/en-us/library/bb397676.aspx