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The string parameter 'key' cannot be null or empty. Parameter name: key
posted

I've attached a sample project, inside the zip file is an overview.txt file that explains what we are trying to do in more detail.

How to reproduce:

If you start running the application and immediately click the search button – you see a postback and the results in the textboxes are displayed in the status textbox below:

Postback Sample Screenshot

But if you start the application and click around with the navigation controls (or select different rows on the grid) and then click on the search button – you get the following exception that appears to be coming from the grid control:

The string parameter 'key' cannot be null or empty.
Parameter name: key

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: The string parameter 'key' cannot be null or empty.
Parameter name: key

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.


Stack Trace:

 

[ArgumentException: The string parameter 'key' cannot be null or empty.

Parameter name: key]

   System.Web.UI.StateBag.get_Item(String key) +8820932

   Infragistics.Web.UI.Framework.Data.DataRecord.GetValue(String fieldName) +87

   Infragistics.Web.UI.GridControls.ControlDataRecord.GetValue(ControlDataField field) +240

   Infragistics.Web.UI.GridControls.ControlDataItemCollection.GetValue(Int32 index) +207

   Infragistics.Web.UI.GridControls.ControlDataItemCollection.GetValue(ControlDataItem item) +71

   Infragistics.Web.UI.GridControls.ControlDataItem.get_Value() +47

   Infragistics.Web.UI.GridControls.GridRecordItem.GetTextNode() +154

   Infragistics.Web.UI.GridControls.ControlDataItem.Infragistics.Web.UI.GridControls.IXPathDataNavigableObject.get_Xml() +156

   Infragistics.Web.UI.GridControls.XPathDataNavigable.GetNextSibling() +43

   Infragistics.Web.UI.GridControls.XPathDataNavigator.MoveToNext() +87

   Infragistics.Web.UI.GridControls.XPathDataNavigator.OutputToStream(XPathDataNavigator xpdn, XmlTextWriter stream, HtmlTextWriter htmlWriter) +329

   Infragistics.Web.UI.GridControls.XPathDataNavigator.OutputToStream(XPathDataNavigator xpdn, XmlTextWriter stream, HtmlTextWriter htmlWriter) +318

   Infragistics.Web.UI.GridControls.XPathDataNavigator.OutputToStream(XPathDataNavigator xpdn, XmlTextWriter stream, HtmlTextWriter htmlWriter) +318

   Infragistics.Web.UI.GridControls.XPathDataNavigator.OutputToStream(XPathDataNavigator xpdn, XmlTextWriter stream, HtmlTextWriter htmlWriter) +318

   Infragistics.Web.UI.GridControls.XPathDataNavigator.OutputToStream(XPathDataNavigator xpdn, XmlTextWriter stream, HtmlTextWriter htmlWriter) +318

   Infragistics.Web.UI.GridControls.XPathDataNavigator.get_OuterXml() +199

   Infragistics.Web.UI.GridControls.GridRenderer.RenderContents(HtmlTextWriter writer) +1251

SampleWebDataGrid.zip
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