Dynamic Placeholder that Saves Child Controls View State

One asp.net custom control that I am loving right now is Denis Baur’s Dynamic PlaceHolder. I’m having to do an web application that must allow for an infinite number of standard web controls and maintain state as these are entered. I went down the AJAX.NET Professional route for a minute but ran into some issues. Instead of recreating the controls on Page_INIT on every request to add a control, I’m able to add to the the new controls to the placeholder list.
Example:
Function AddProduct(Byval strPN as String)


Dim Count As Int32 = CType(ViewState(strPN & "Count_v"), Int32)

Count += 1 'increase viewstate count
Dim ddlProduct as New DropDownList

with ddlproduct

.id = "ddl" & strPN "Product" & Count.ToString()

dphP.Controls.Add(ddlproduct) 'add to dynamic placeholder

end with
ViewState(pn & "Count_v") = Count 'add back to viewstate count

End Function

Written by Tim on March 2nd, 2006 with 2 comments.
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