Server Error

[Denny]

Hi you all guys

Well i hope if anyone could help de with this type or error, it haapens when
the same page is open and another user try to update the page!!

This is the error that trow:

Server Error in '/webgui' Application.
------------------------------------------------------------------------------
---------------------------------------------------------------

Specified argument was out of the range of valid values. Parameter name:
value

Description: An unhandled exception ocurred 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: Specified argument was
out of the range of
valid values. Parameter name:value

Source Error:

Line 921: if(this.Request["Action"]!
=null)
Line 922: {
Line 923: this.CardActionList.
SelectedIndex = System.Int32.Parse(this.Request.
["Action"]
..ToString())
Line 924: if(this.Request["PAN"]
!= null)
Line 925: this.PAN.Text
= this.Request["PAN"].ToString()


Source File: C\webgui\case\CardMgment.aspx.cs Line 923

Stack Trace:

[ArgumentOutOfRangeException: Specified argument was out of the range of
valid values.
Parameter name: value]
System.Web.UI.WebControls.ListControl.set_SelectedIndex(Int 32 value)
+151
EBT.Web.GUI.CardMgment.Page_Load(Object sender, EventArgs e) in C:\
webgui\case\CardMgment.aspx.cs
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750
------------------------------------------------------------------------------
---------------------------------------------------------------

Version Information: Microsoft.NET Framework Version 1.1.4322.2032; ASP.NET
Version:1.1.4322.2032


So much thank u'sss in advance!!!!!!!1