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Ask To Save

There are several times when we need to ask the user if they want to save.

1. When they select New from either the menu or tool strip,
2. When they select Open from either the menu or tool strip,
3. When they select Exit from the menu, or try to close the program using the X at the top right corner.

We need to make sure that we know if there are any changes: Click on the rich text box and add the code below:

 
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
   // Set change to true if there are any changes to the rich text box.
   changed = true;
}

Write the code for AskToSave as shown below:

private Boolean AskToSave()
{
   // If there is no change to rich text box don't ask, don't save, and don't cancel
   DialogResult result= DialogResult.No;
   if (changed)
   {
      result = MessageBox.Show("Do you want to save changes to " + currentFileName + "?", "Closing", MessageBoxButtons.YesNoCancel);
      // If they answer yes, write the file
      if (result == DialogResult.Yes) SaveFile();
   }
   // Returns true if they selected cancel. 
   // Returns false if there has been no change.
   return (result== DialogResult.Cancel);
}

To Do: Think about when you would call this.

End of lesson, Next lesson: That is the last C# lesson in this course.