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Editorial Team
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Asked: 2026-05-11T19:52:47+00:00

I am getting the following error while i submit a form after i added

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I am getting the following error while i submit a form after i added a dropdown box in my designer

System.NullReferenceException: Object reference not set to an instance of an object. at WebApplication1._Default.collectEmailBodyText() in C:\v1.5_production_05June09\Default.aspx.vb:line 219

Below is the extra two lines that i added in collectEmailBodyText() 

tempPanelDropDownBox = DirectCast(form1.FindControl(("txt_" & panelUsed & "_ddinput") + counter.ToString()), DropDownList)

tempCollector = tempCollector + “: ” + tempPanelDropDownBox.SelectedItem.Text

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1 Answer

  1. Editorial Team

    As the other posters have said, it seems likely that the call to the FindControl method is returning Nothing (null), so then trying to access a property like SelectedItem will cause the NullReferenceException.

    Your code FindControl("txt_" & panelUsed & "_ddinput") + counter.ToString()) is trying to find a drop-down list with a server ID of some strings concatenated together and then what looks like a variable number at the end. This seems a bit odd; do you really want the number at the end? I’d expect something like that when using dynamically-added controls.

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