Dynamic - Why Is ViewState Retained With An Dropdownlist But Not An Table
Jan 10, 2011
I have an asp.net web form, and on it I have two controls (well, more than these two but we'll focus on these) - the first is an asp:dropdownlist and the second is an asp:table.
Both of these controls are declared on the HTML side, and filled (child controls added) in the code-behind page.
My simple question (hopefully with a simple answer) is this:
Why does the viewstate persist for the dropdownlist, and NOT for the table?
I have to fill the table on every page load, but I can fill the dropdownlist once (using Not Page.IsPostBack), and it persists.
NOTE: I have read about the lifecycle of ASP.NET pages, and I have tried placing these same calls in the Init() and PreInit() page events with the same results.
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Dec 3, 2010
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Jan 25, 2011
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[Code]....
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Jan 27, 2011
Setup:
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[code]....
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[Code]....
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[URL]
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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using System;
using System.Collections.Generic;
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using System.Web;
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[Code].....
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TABLE A TABLE B
TABLE C
Id id id
Quote_no Quote_no Quote_ no
Name Rate1 Equip_name
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R2_rate
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Rate2
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Feb 25, 2011
I have an ASCX control which is a special dropdownlist. I add that control dynamically to the page and fill it with data. This control has a postback that will change the contents of a second dynamically created standard dropdownlist.
When I change the selection on the first dropdown, the indexchanged fires and I get new data and attempt to place it in the second dropdownlist's items collection, by first clearing it then filling it with new data.
This works fine the first time a change the selection, but when I select a second time the following error is thrown:
The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.
I'm not adding or removing new controls in the fired event, only changing data. And again, it works the first time, but doesn't subsequent times.
If I disable stateview on the child control, then the control just doesn't get updated with data at all.
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