Does anyone know whyToolStrip toolbox item fails with the below exception messagewhen
drop it on the design surface from toolbox in the DesignHost sample?

Exception message:
The control System.Windows.Forms.ToolStrip has thrown an unhandled exception in the designer and has been disabled.
Exception: Object referenced not set to an instance of an object
StacK trace:
at System.Windows.Forms.ToolStrip.OnHandlerCreated(EventArgs e)
at System.Windows.Forms.ToolStrip.WndProc(Message& m)

Thanks in advance.

Hi,

The "Object reference not set to an instance of an object" exception usually happens when there is an attempt to reference a null object.

But unfortunately, I am not able to reproduce this issue when drop the toolstrip to the form. Could you give me information about this issue?

Best regards,

Ling Wang

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Hello,

Download the DesignerHost.exe package from http://support.microsoft.com/?id=813808.
Add the following lines in ToolboxPane.cs (line 50):

private Type[] windowsFormsToolTypes = new Type[] {
...
typeof(System.Windows.Forms.MenuStrip),
typeof(System.Windows.Forms.ToolStripContainer),
typeof(System.Windows.Forms.ToolStrip),
typeof(System.Windows.Forms.StatusStrip)
}

Run the application, then click on"File Menu"->"New" and drag a MenuStrip or ToolStrip control from
"WindowsForms" toolbox tab. A MessageBox with the error shown in prevoius post is displayed.

Thanks.

I'm experiencing exactly the same issue. Can anyone offer a solution? Thanks a lot!