Hello,

We have currently performed some load testing on our application and it appears that with an increased load we are seeing the error below repeated with quite high frequency. This cannot be reproduced in a single development environment.

The error (from our internal log) is:

<Table1>

    <Error_Type>System.InvalidOperationException</Error_Type>

    <Error_DateTime>2010-02-05T09:11:50+00:00</Error_DateTime>

    <Error_Code>-2</Error_Code>

    <Error_Description>Collection was modified; enumeration operation may not execute.</Error_Description>

    <Error_Source>mscorlib</Error_Source>

    <Error_Stack_Trace>   at System.Collections.ArrayList.ArrayListEnumeratorSimple.MoveNext()

   at Infragistics.WebUI.Shared.GlobalCssHelper.OnPreRender(WebControl control, Page page)

   at Infragistics.WebUI.UltraWebTab.UltraWebTab.OnPreRender(EventArgs e)

   at System.Web.UI.Control.PreRenderRecursiveInternal()

   at System.Web.UI.Control.PreRenderRecursiveInternal()

   at System.Web.UI.Control.PreRenderRecursiveInternal()

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)</Error_Stack_Trace>

    <Error_Caused_By_Method>Boolean MoveNext()</Error_Caused_By_Method>

    <Optional_Text_1 />

    <System_Entry>Start</System_Entry>

    <System_Personnel_ID>769fb8cde8637fd</System_Personnel_ID>

    <Active_Personnel_ID>41dc97e271125fc1</Active_Personnel_ID>

    <Active_Form>Personnel</Active_Form>

    <DB_Connection_Info />

    <Exception_Index>12</Exception_Index>

  </Table1>

The key bit is of couse the stack trace and the description.

Any assistance would be greatly appreciated.

Thanks,

Gary...