如何在Visual Studio 2010中将用户控件添加到Windows窗体应用程序？

添加到什么？只需创建一个用户控件。添加它与任何其他控件没有什么不同。我假设您知道如何添加任何其他控件，因为在尝试使用某些可用控件之前，您不太可能从用户控件启动。你更有可能，并且刚开始尝试用户控件，所以你可能对添加它有疑问。所以，不要怀疑，甚至不用担心它：它会被添加到工具箱中而不需要你的任何努力，你可以像你原来那样将它添加到表单或其他控件中。 />

-SA

Add to what? Just create a user control. Adding it is no different from any other controls. I assume you know how to add any other control, because it's very unlikely that you started from a user control before you tried to use some available controls. It's more likely that you did, and just started to try a user control, so you might have a doubt about adding it. So, don't doubt, don't even worry about it: it will be added to the toolbox without any efforts from your side, and you can add it to your forms or other controls the same way as you already did.

—SA