[Resolved] Application not using switch for returned string from server

[Tural]

Alright, I have a program communicating with my server to login. The server sends back a success or failure code. The application gets the code, but doesn't use the switch/case I have set up in order to proceed.

string returnString = WebConnection.SendPostData("http://site.com/login.php", "username=" + strUsername + "&password=" + strPassword);
            //MessageBox.Show(returnString);
            switch (returnString)
            {
                case "1":
                    {
                        //Login success
                        MessageBox.Show("Login successful.");
                        //Insert Login code here
                        break;
                    }
                case "2":
                    {
                        //Login failure
                        MessageBox.Show("Login failed.");
                        Application.Exit();
                        break;
                    }
            }

If I enable the messagebox to display returnString, it properly shows me either 1 or 2, which it gets from the server. However, from there it doesn't display either of the messageboxes which show success or failure or execute the code it should be using. If I set one of the cases to default, it takes that regardless of the server's response. Is there something I'm missing with the way I'm using case to compare a string?