[C#] LINQ to SQL(Sum)

// 2011/07/13 - LINQ query (SUM)

var tSum =

from p in db.TBSimulation    // from절y

where p.USERID == this.hdUSERID.Text

                && p.GROUPID == "A"     // where절y

select p.RESULT;             // select절y

           

        // Total Profit

        this.lblTPROFIT.Text = tSum.Sum().ToString();