Datalistview being kinda weird

I have no images here because I'm too lazy, but my datalistview is being weird. For some reason I can't make it to where there is not a duplicate of some sort. The code goes something like, you enter in a text into a text bar and press "add data" and the add data will send the text you had in the lists, then you press a show lists button that will show what you had entered into the previous box. If I were to enter the box again, not only will it show what you have previously put into the box, but it will keep on duplicating them. I have tried duplicating code from other projects that contain a fix to this, but when I modify it to fit this project it does not work.

Welcome,
You can not expect us to help you if you are to lazy, as you call it, to provide information.

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