[HttpException (0x80004005): Cannot have multiple items selected in a DropDownList.]
System.Web.UI.WebControls.DropDownList.VerifyMultiSelect() +104
System.Web.UI.WebControls.ListControl.RenderContents(HtmlTextWriter writer) +11776164
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +50
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +11835345
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +50
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
System.Web.UI.Page.Render(HtmlTextWriter writer) +39
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8753
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