//load textfields to local variables
        string User = UserName.Text.ToLower().Trim();
        string Pass = UserPass.Text.ToLower().Trim();

        //Check Credentials
        var xrm = new XrmServiceContext("Xrm");
        var Inspectors = from i in xrm.SystemUserSet
                         where i.new_MobileAppUser.Equals(User.ToString())
                         select new { InspectorPass = i.new_MobileAppPassword
                         };

        if (User == null || Pass == null)
        {
            lblMsg.Text = "You must enter a valid username and password";
        }

        if (Inspectors == Pass)
            {
                // do something (correct password)
                FormsAuthentication.RedirectFromLoginPage(UserName.Text, chkPersistCookie.Checked);
                Response.Redirect("/default.aspx");
            }
            else
            {
                // something else (incorrect password)
            lblMsg.Text = "Sorry, Invalid credentials. Please try again.";
            }