If you mean something like this, place a Button on the form, build/run and the button does not show or you wrote code that does not execute). If this is similar to your issue then right click on Solution Explorer and select "Configuration Manager".
A dialog appears (like shown below) Make sure Build is checked for this project.

If that does not help, close Visual Studio. Open the project folder and delete obj and bin folder then restart Visual Studio and try build/run again.

Still not helping? Are there any third party controls on the form? This might be an issue.
Are there any Visual Studio extensions installed? Disable them.
Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem. Contact via my Twitter (Karen Payne) or Facebook (Karen Payne) via
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