How to resolve msg "ActiveX control cannot be instantiated b/c the current thread is not in a single-thread apartment"

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How to resolve msg "ActiveX control cannot be instantiated b/c the current thread is not in a single-thread apartment"

Giacomo Raucci 346

In the process of converting from a VBA app to a Winform App using Visual Studio 2019 Windows Forms App (.NET Framework). Once I added an InkPicture control, I get a message "ActiveX control nnn cannot be instantiated because the current thread is not in a single-thread apartment. Suggestions? Thanks for your help.

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Answer 1

Viorel 122.6K

Try opening the Program.cs, find the Main function and make sure that it has the [STAThread] attribute:

[STAThread]
static void Main()
{
   . . .
}

Usually this attribute is present by default. Check if the control works in a new simple Forms application.

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How to resolve msg "ActiveX control cannot be instantiated b/c the current thread is not in a single-thread apartment"

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