Question

So I have a Windows form with a few fields to accept data and write to a SQL database. My button_click event is what handles all the work except for validating the user input. These are handling by separate methods. My question is that if a user has incorrect input, how do I reset the form after showing the messagebox? Maybe just use the button click event to start a separate method so I can control it better?

private void enter_button_Click(object sender, EventArgs e)
{
    restart:
    try {
        try {
                Validate(fname);
                Validate(lname);
                Validate(city);
                Validate(state);
        } catch (Exception ex) {
            MessageBox.Show(ex.Message);
            if (ex != null) {
                fname.Clear();
                lname.Clear();
                city.Clear();
                state.Clear();
                goto restart;
            }
        }
        try {
            exValidate(address);
        } catch (Exception ex1) {
            MessageBox.Show(ex1.Message);
            if (ex1 != null) {
                address.Clear();
                goto restart;
            }
        }
        //blah blah...write to database.
    }
    // ...
}

Answer 1

My suggestion would be use a background worker thread to handle the logic and just have the background worker triggered by button_click. That way you can terminate the background worker thread if the user makes a mistake and restart the whole process via button_click.

Sources:

how to keep a control disabled till a thread ends

http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx