The item was specified more than once in the "Resources" parameter. Duplicate items are not supported by the "Resources" parameter

Question

While compiling my Visual Studio C# project, i am getting the following error:

The item "obj\Debug\SampleProject.Forms.MDIMain.resources" was specified more than once in the "Resources" parameter. Duplicate items are not supported by the "Resources" parameter.

However i have searched a lot on internet but none of the solution worked for me.

I tried to delete the form and re-added it into the project, but it doesn't work for me.

I only have one resx file.

I am using VS 2010.

Also, i tried the following solutions but it not worked for me:

1. https://stackoverflow.com/a/7928191/2074603
2. https://stackoverflow.com/a/10066009

Answer 1

Easy!

1. Right-click your project and select "Unload Project"

2. Right-click again and "Edit your_project.csproj"

3. Search for the duplicate files mentioned in the error message and remove them.

4. Save and close.

5. Right-click to choose "Reload Project" view image

Answer 2

I had this problem recently, and I think I figured out my particular situation, so maybe it will help you.

I had used the Visual Studio IDE to copy an existing form (let's call it Form1). I pasted it into the same project (it arrived as Copy of Form1)

I then renamed that new copy to Form2.

It took me a while, but I eventually found that the IDE had renamed both Form1 and Copy of Form1 to Form2

The filenames were correct... just the actual classes inside were named.

I manually renamed the original back to the proper class and voila, it worked.