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Asked: 2026-05-23T16:47:57+00:00

I have just started working on c#, and was fiddling with some code sample

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I have just started working on c#, and was fiddling with some code sample that I got from some forum.

This code is using a namespace using system.windows.forms for which I am getting an error:

Forms does not exist in the namespace system.windows.

Also I am getting some error related to undefined functions for senddown & sendup which I believe to be in the Forms name space.

I am using visual studio 10 (with .net frame work 4.0). Any idea how to fix this error?

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1 Answer

  1. Editorial Team

    Expand the project in Solution Tree, Right-Click on References, Add Reference, Select System.Windows.Forms on Framework tab.

    You need to add reference to some non-default assemblies sometimes.

    From comments: for people looking for VS 2019+: Now adding project references is Right-Click on Dependencies in Solution Explorer.

    For people looking for VS Code: How do I add assembly references in Visual Studio Code

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