Determine If Changed Event Occurred from User Input Or Not

Question

In C#, the Changed event for a control (say, a numericupdown) gets fired whether the value was change directly by the user or if it was changed programatically as the result

Answer 1

There is no nice way to do it. You can find workarounds for specific cases, e.g.

• listen to MouseDown or something instead of valueChanged on the numeric drop down.

• Set a flag in button click event handler that will prohibit the message box from showing.

  In general you should try to organize your form in a way that it doesn't matter where the value got changed.