Server Error in '/' Application.

Input string was not in a correct format.

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.FormatException: Input string was not in a correct format.

Source Error: 


Line 21: 			
Line 22: 			''1   Ò»°ã»áÔ±
Line 23: 			if Session("USER_LVL")=1 then
Line 24: 				strTop=ReadHtmlPage("","Index_sys_left_lvl1.html")	
Line 25: 				strHtml=strTop+strMenuItem

Source File: f:\usr\cw1e138\Index_sys_left.aspx.vb    Line: 23

Stack Trace: 


[FormatException: Input string was not in a correct format.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) +211
   Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(String Value, NumberFormatInfo NumberFormat) +74

[InvalidCastException: Conversion from string "" to type 'Double' is not valid.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(String Value, NumberFormatInfo NumberFormat) +218
   Microsoft.VisualBasic.CompilerServices.Operators.CompareObject2(Object Left, Object Right, Boolean TextCompare) +2984
   Microsoft.VisualBasic.CompilerServices.Operators.ConditionalCompareObjectEqual(Object Left, Object Right, Boolean TextCompare) +25
   CQFIT.CQFitPage.PrintSysLeftMenu() in f:\usr\cw1e138\Index_sys_left.aspx.vb:23
   ASP.index_sys_left_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in f:\usr\cw1e138\index_sys_left.aspx:16
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +98
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.Page.Render(HtmlTextWriter writer) +26
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2558

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433