Insert Query in Linq in asp.net

protected void btn_insert_Click(object sender, EventArgs e)

    {

        var userInsert = new userCredential()

        {

            uname_db = TextBox1.Text,

            password_db = TextBox2.Text

        };

        mylinq.userCredentials.InsertOnSubmit(userInsert);

        mylinq.SubmitChanges(); 

    }