I am brand new with C#, so bear with me and don't laugh...
I am working through Microsoft's book for C#. The second exercise is to create a very basic Windows form application. After it was completed, and I click "Start Without Debugging", it worked fine.
However, after the first time, if I try to run the little application, the form pops up, and then immediately disappears.
I loaded some of the other supplied form type applications and they all do the same thing.
This has to be simple. Any ideas

Windows Form Applications Run Without Stopping
Troy Lundin
Raybritton
RayCan
Pat J
glenrm
this type of behavior could arise when your Form object leave the scope of visibility. if you use console application type of project you should wait in the main thread for the form to complete. consider this example
MyForm form = new MyForm();
Console.ReadLine();
or try to create new Windows Form project