Check if textbox text was changed since form was opened?

You could store the initial value in the . Tag value of the textbox then just do a comparison between current text and the tag text.

You can have a boolean flag related to each one of your text boxes and use the textchanged event of the textbox when that event is fired it means that text in the sender textbox has changed so you have to set the flag to show that text for this textbox has changed . *if you want yoiu can use textbox. Tag instead of the mentioned flag.

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