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Asked: 2026-05-10T20:06:24+00:00

I am overriding a Grid, adding some customer features. One of the features is

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I am overriding a Grid, adding some customer features. One of the features is a drop-down to adjust page size. I am extending the grid using a customer server control, which works great for what I’ve done so far. Now, however I am having a bit of trouble getting the dynamically added control to do a postback. The javascript to initiate the postback is not present.

Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)     Dim pageSizePanel As New Panel     ...     Dim countList As List(Of String) = GetCountList()     Dim pageSizeDropdown As New DropDownList()     pageSizeDropdown.ID = 'pageSizeDropdown'     pageSizeDropdown.DataSource = countList     pageSizeDropdown.DataBind()      AddHandler pageSizeDropdown.SelectedIndexChanged, _                AddressOf HandlePageSizeChange      pageSizePanel.Controls.Add(pageSizeDropdown)     ...     MyBase.Controls.AddAt(0, pageSizePanel)     MyBase.OnPreRender(e) End Sub

The HTML is

<select name='tab$grid1Tab$RadGrid1$pageSizeDropdown'      id='tab_grid1Tab_RadGrid1_pageSizeDropdown'>         <option selected='selected' value='10'>10</option>         <option value='20'>20</option>         <option value='40'>40</option>         <option value='80'>80</option>         <option value='All'>All</option>      </select>

So, does this have to do with when I’m ‘injecting’ the controls? Does it have to do with dynamic addition of the controls?

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1 Answer

  1. The first thing I noticed was you’d be missing this:

    pageSizeDropdown.AutoPostBack = true

    but I’m not sure if that’s all you need for it to work

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