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Home/ Questions/Q 866451
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T09:48:27+00:00 2026-05-15T09:48:27+00:00

When I’m trying to change the default Image of a Control on Windows Forms

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When I’m trying to change the default Image of a Control on Windows Forms in Form Designer (no matter where on which control) I get this error:

Error message: An item with the same
key has already been added

I tried to delete and recreate the Resources.resx file.. I assured that only 1 resx file with these keys exist.. (in fact that’s my only resource file) but it still does not work.

I have som strings in it and some images. That’s all.

Any idea?

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  1. Editorial Team
    Editorial Team
    2026-05-15T09:48:28+00:00Added an answer on May 15, 2026 at 9:48 am

    I had this problem too. The solution is to never create a .resx file with the name “Resources.resx” because it conflicts with the “Resources.resx” files that can be automatically created in the project’s properties dialog.

    Just right-click and rename the “Resources.resx” and you should be able to change images perfectly.

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