In my c# windows application whenever I open my solution in visual studio 2008, than \"MyApplication.vshost.exe\" is always visible at window task manager--> Process tab.
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You can read more about vshost.exe on MSDN.
The hosting process is a feature in Visual Studio 2005 that improves debugging performance, enables partial trust debugging, and enables design time expression evaluation. The hosting process files contain vshost in the file name and are placed in the output folder of your project.