login page with the help of linq pages

See more:

C#

ASP.NET4

Dear,

I want to use linq to sql class and with the help of this class I want to make a login page. when I wite following code..

DataClassesDataContext db = new DataClassesDataContext();
        var q1 = from log in db.logins
                 where log.userid == Login1.UserName && log.password == Login1.Password
                 select log;
        if (q1 != null)
        {
            Server.Transfer("AdminPannel.aspx");
        }

Above bold part of the code give error that log does not contain a userid and password defination. plz Please help me