[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.First(IEnumerable`1 source) +405
NewFartash.Product.WebForm1.getSuberGroupName() in D:\Projects\NewFartash\NewFartash\Product\WebForm1.aspx.cs:132
ASP.product_webform1_aspx.__Renderform1(HtmlTextWriter __w, Control parameterContainer) +804
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +11835153
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.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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