[InvalidCastException: Conversion from type 'DBNull' to type 'Currency' is not valid.]
Microsoft.VisualBasic.Strings.FormatNumber(Object Expression, Int32 NumDigitsAfterDecimal, TriState IncludeLeadingDigit, TriState UseParensForNegativeNumbers, TriState GroupDigits) +720937
ASP.group_discussion_aspx.DoGroupDetails(String cat_id) in C:\sites\ebrandon\group_discussion.aspx:521
ASP.group_discussion_aspx.Page_Load(Object Src, EventArgs E) in C:\sites\ebrandon\group_discussion.aspx:80
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +42
System.Web.UI.Control.OnLoad(EventArgs e) +132
System.Web.UI.Control.LoadRecursive() +66
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428
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