asp.net - How to assign a default value to DetailsView in insert mode? -


i tried write code assign value when change detailsview insert mode. example, need assign id in field:
1- converted field (edit template).
2- give new id.
3- used code in button_click below : 

    protected sub button1_click(sender object, e eventargs) handles button1.click     detailsview1.changemode(detailsviewmode.insert)     dim txt textbox     if detailsview1.currentmode = detailsviewmode.insert         txtbox = directcast(detailsview1.findcontrol("textbox1"), textbox)         txtbox .text = viewstate("932")     end if end sub

but when clicked button gives me error.

object reference not set instance of object.

any please ?


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