VB.net Windows Forms application - main form not opening

Hi
I am building my first Windows Forms app ( I usually build VB.net Excel add-ins). My main form opened just fine but suddenly isn't opening. What might be causing this?
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
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duncanb7Commented:
Could you provide the code ? OR write it in detail about what you did
before the form was opened

Duncan
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Fernando SotoRetiredCommented:
When is the form not opening, at design time or run time?
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
I think that would be design time, in other words when I debug it. The strange thing is  that when I turned my machine on this morning it miraculously worked. I don't understand this. Is there perhaps some sort of mechanism that disables the app
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Jacques Bourgeois (James Burger)PresidentCommented:
If there is a mechanism that disables the application, it's in the application itself.

If you restart your computer, do you get the same thing? It starts the first and does not start after that?

If so, it may be that you do not close the application properly. What code do you use to terminate the application?

For instance, if the application was not closed properly and was compiled as a single instance application (Application tab of the of the project's Properties Window, at the bottom of the Project menu), then it still runs invisible in the background, and calling it simply drops you in an application that has nothing displayed.

You can check for that through the Task Manager after you think you have closed your application.

And what code do you have when you start the application? This code might be checking something that prevents the application from starting properly.
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks for the advice
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