Server Error in '/' Application.

Index and length must refer to a location within the string.
Parameter name: length

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.ArgumentOutOfRangeException: Index and length must refer to a location within the string.
Parameter name: length

Source Error:


Line 782:
Line 783:                        string chuoicuoi = lines[lines.Length - 1].Trim().ToLower();
Line 784:                        chuoicuoi = chuoicuoi.Substring(0, 2);
Line 785:                        if (chuoicuoi == "bv")
Line 786:                        {

Source File: c:\www\niferco.com.vn\App_Code\VQS.cs    Line: 784

Stack Trace:


[ArgumentOutOfRangeException: Index and length must refer to a location within the string.
Parameter name: length]
   System.String.Substring(Int32 startIndex, Int32 length) +14794088
   TTV.VQS.get_ControlCurent() in c:\www\niferco.com.vn\App_Code\VQS.cs:784
   Site.Page_Load(Object sender, EventArgs e) in c:\www\niferco.com.vn\Site.master.cs:42
   System.Web.UI.Control.OnLoad(EventArgs e) +106
   System.Web.UI.Control.LoadRecursive() +68
   System.Web.UI.Control.LoadRecursive() +162
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3429.0