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Asked: 2026-06-17T05:43:27+00:00

I am having a very strange issue with VS 2012. When in design time

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I am having a very strange issue with VS 2012. When in design time of a winform application if I open a specific form the login form appears on the screen, not as in designer, but as if the application had been launched.

I can open the login form in design time
The login form in design time

but when I open another form called Print this happens enter image description here

Clearly the form I have tried to open has not opened in the designer, and instead the application seems to have been launched. If I interact with the form by closing it then visual studio crashes. Also in the task manager the process is Devenv.exe.

I have tried clearing the obj and bin folders with no luck.

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1 Answer

  1. Editorial Team

    If you have some initializers in an _Load-method of the second form which for example ask for a login, the thing will be executed.

    You can check for the following 3 points in ‘_Load’ of 2. form, if any occurs just do not execute the code in ‘_Load’.

    this.GetService(typeof(IDesignerHost)) !=null

System.ComponentModel.LicenseManager.UsageMode == System.ComponentModel.LicenseUsageMode.Designtime

System.Diagnostics.Process.GetCurrentProcess().ProcessName == "devenv"
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