Server Error in '/' Application.

Value cannot be null.
Parameter name: String

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: String

Source Error:

Line 66:         {
Line 67:             string sl;
Line 68:             int classid =int.Parse(pg_GetQueryString("cid"));
Line 69:             if (classid==0) {
Line 70:                 classid = 523733;

Source File: d:\web\\industry.aspx.cs    Line: 68

Stack Trace:

[ArgumentNullException: Value cannot be null.
Parameter name: String]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +11013414
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +145
   System.Int32.Parse(String s) +23
   TCms.Web.industry.bindNews2() in d:\web\\industry.aspx.cs:68
   TCms.Web.industry.Page_Load(Object sender, EventArgs e) in d:\web\\industry.aspx.cs:33
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34209
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