[DotNetDevelopment] Linq Update

[Santhosh V Kumar]

Hi all,
        Today I am trying to do Update the value of a particular row
with LINQ but I am finding the but can some one please help me to get
ride of this. Here is my code

DataClasses1DataContext db = new DataClasses1DataContext();
            login log = db.logins.Single(p => p.uname == "san");
            log.pword = TextBox1.Text;
            log.logi = TextBox2.Text;
            db.SubmitChanges();


no changes gets affected in table.


Thanks in Advance
Santhosh Kumar (SK)