I'm using VS2010 (C#) for a WinForm database program. I've created a dataset, myds, which generates a couple of related files:
When I edit the xsd-file in design mode, perhaps just move around a TableAdapter, myds.Designer.cs makes a copy of itself to myds1.Designer.cs. After that I can't compile the program because the all the types and definitions becomes declared twice (they allready exists in the original myds.Designer.cs-file). It's quite annoying having to delete the copy every time I've made minor changes to that file. Why is it doing this, and can I prevent VS2010 from making this copy?
It is a known bug.
Solution
Unload the project containing your dataset.
Edit the project file (example 'datasetobjects.csproj') with text editor. If you have another datasets you can find rows as:
<None Include="My_DS.xsd">
<SubType>Designer</SubType>
<Generator>MSDataSetGenerator</Generator>
<LastGenOutput>My_DS.Designer.cs</LastGenOutput>
</None>
And the problem is in the row <LastGenOutput>My_DS.Designer.cs</LastGenOutput>.
It may be misssing or incorrect for your DataSet.