I created the base form and inherited form.
I changed inherits clause in the inherited form's Designer.vb to "inherits xxxx.BaseForm"
Then, I opened the inherited form in design, I got this error.

"The service System.Windows.Forms.Design.IEventHandlerService already exists in the service container. Parameter name: serviceType "

Please anyone, I need your help.
Thanks.

Hi,

It seems that both the base form and the inherited form have a same property. You may comment out the duplicate property in the inheirted form and reopen it in the designer to see if the problem still exists.

Sincerely,
Linda Liu

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Please remember to mark the replies as answers if they help and unmark them if they provide no help. end us any feedback you have about the help from MSFT at fbmsdn@microsoft.com.

Hi,

It seems that both the base form and the inherited form have a same property. You may comment out the duplicate property in the inheirted form and reopen it in the designer to see if the problem still exists.

Sincerely,
Linda Liu

---

Please remember to mark the replies as answers if they help and unmark them if they provide no help. end us any feedback you have about the help from MSFT at fbmsdn@microsoft.com.