Error in Application.Run(DisplayLoginForm) and Remote Authentication in SharePoint Online Using the Client Object Model

Question

Hi guys
I Think that is a simple error, but I don’t have enough knowledge in .NET apps.
I make an console app that use Remote Authentication in SharePoint Online Using the Client Object Model, that a I downloaded from MSDN.
This App run ok.
But when I like to make a Windows From App. This component send me an error in Application.Run(DisplayLoginForm)
This err msg :
 An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
Additional information: Starting a second message loop on a single thread is not a valid operation. Use Form.ShowDialog instead.
Is there any way to use a form inside a windows form?
Thank in advance
Ramiro
Ramiro B

Answer 1

Hi,
Based on the error message, please do as following:
1. Check your code logic below:
void btn_Click(object sender, System.EventArgs e)
Thread t = new Thread(StartMyForm);
t.TrySetApartmentState(ApartmentState.STA);
t.Start();
public static void StartMyForm()
Application.Run(new MyForm(..));
2.Try to add the following code line in your code.
Application.Restart();
If the issue still exists, please provide your requirement and code for a further research.
Best Regards
Dennis Guo
TechNet Community Support