[HttpException (0x80004005): Cannot have multiple items selected in a DropDownList.]
System.Web.UI.WebControls.DropDownList.VerifyMultiSelect() +109
System.Web.UI.WebControls.ListControl.RenderContents(HtmlTextWriter writer) +11606832
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +50
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
ASP.modules_nhaphoc_dstrungtuyen_aspx.__RenderContent2(HtmlTextWriter __w, Control parameterContainer) +168
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
ASP.masterpage_master.__Renderform1(HtmlTextWriter __w, Control parameterContainer) +589
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +11661775
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53
ASP.masterpage_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer) +157
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +169
System.Web.UI.Page.Render(HtmlTextWriter writer) +40
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4239
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