TextBox event for only user input

Question

I have a Textbox control which sometimes updated programmatically and also can be update by the user. How can I distinct between those two event? I'd like to have a "Dirty" flag set to "True" when the user changes the text.

Answer 1

Check Modified property of TextBox on the TextChanged event. If true, the changes were made by user, otherwise the text was changed programmatically.

Example:

void Texbox_TextChanged(object sender, EventArgs e)
{
    if (((TextBox)sender).Modified)
        TextboxUserInput();
}