Windows application

You should find this vshost.exe under the bin folder or the debug folder of your application.This is not required when you deploy the application.Hence try deleting this & then run again.

You can configure Visual Studio so that the vshost.exe file is not created by the following steps.
1. Right Click on Project in Solution Explorer and Select Properties

2. Click on the Debug Tab if it's not already selected.

3. Uncheck the Enable the Visual Studio Hosting Process checkbox under the Enable Debuggers Section