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c# - F5 or Start Debugging Button is Greyed Out for Winform application?

I know there are many question related to this already on SO but none of them has woked for me till now.

I have a winform application but when I am trying to debug it my Start button is disabled.

Now when I am trying to debug my Start Debugging key is disabled

enter image description here

Things which I have already done are:

1) I have already set my winform application as the Single Start Up project.

2) I have removed the multiple start up project option.

3) I have tried to restart my Visual Studio many times.

4) I have rebuild the application and it is building successfully with no errors.

5) I have build the entire solution and it also build successfuly with no errors.

6) I have checked the sln file and the Format version in it is:

Microsoft Visual Studio Solution File, Format Version 11.00

which I suppose is correct.

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Go to the solution Explorer Right click on the solution /Project name and choose set as startup project, it should be enabled.

Go to the solution Explorer Right click on the solution /Project name and choose set as startup project


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