private void LoginUser()
{
//if fore-color of a textBox is not black, that means the textbox
//contains the placeholder text and user didn't enter any value
string username = UsernameTextBox.ForeColor == Color.Black?
UsernameTextBox.Text : "";
string password = PasswordTextBox.ForeColor == Color.Black?
PasswordTextBox.Text : "";
if (username.Length < 1)
{
ShowErrorMessage("Please enter username.");
return;
}
else if (password.Length < 1)
{
ShowErrorMessage("Please enter password.");
return;
}
//disable all controls so that the user cannot
//change anything until the login process ends
DisableAllControls();
//show progress bar
string status = "Verifying your login credentials, please wait...";
ProgressViewerForm progressViewer = new ProgressViewerForm(status);
progressViewer.Location = new Point(this.Location.X + 70, this.Location.Y + 100);
progressViewer.Show();
_progressViewerObject = progressViewer;
//send web request to verify user's login credentials
WebHandler webRequest = new WebHandler();
webRequest.WebRequestSuccessEventHandler += OnLoginSuccess;
webRequest.WebRequestFailedEventHandler += OnLoginFailed;
_webHandlerObject = webRequest;
webRequest.AuthenticateUser(username, password);
}
