Question

I have an application that has a few different forms. From the main form I can open a number of other forms, I use the following command to display the chosen window:

frmConversions.ShowModal;

Once the user has completed what they need to do in that window and they close that window I close the window using the following:

frmConversions.Close;

However if the user then goes back to frmConversions, the settings that they had previously chosen will still be selected/entered. Am I handling multiple windows correctly and if so how do I stop the retention of data?

Answer 1

It depends on how you create the form. If you auto-create the form, then it will exist for the lifetime of the program and so will retain any values stored in the form’s variables. If, however, you create modal forms whenever needed and free them afterwards (as is the custom), then values will not be stored. This is done thus

with TFrmConversions.Create(nil) do
  try
    ShowModal;
  finally
    Free;
  end;