ASP.NET error

Hi Experts,

I'm not a programmer but I'm managing a server running ASP.NET, IIS and SQL server on Windows 2000 server. My server is updated with all lastest paches and updates but I'm getting a list of errors in the application log of my system. This error is causing so many problems to the users using our web application and when I check the performance of my server like Memeory, CPU and Network usage it is normal.  I want to know if this error is coming becuase of any problem with the server or some thing is going wrong with the ASP code to get/save the information from the SQL server which is running on the local machine.

I'm not a programer
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 06/12/2006 15:52:39
Event time (UTC): 06/12/2006 15:52:39
Event ID: f6131b8150b44a66985a3e6d7a00c5fb
Event sequence: 8349
Event occurrence: 190
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/1/Root/LatestCallSheet/Manageranges.net-2-128098909042717680
    Trust level: Full
    Application Virtual Path: /LatestCallSheet/Manageranges.net
    Application Path: c:\inetpub\wwwroot\LatestCallSheet\Manageranges.net\
    Machine name: UTOPIA
 
Process information:
    Process ID: 3376
    Process name: w3wp.exe
    Account name: NT AUTHORITY\NETWORK SERVICE
 
Exception information:
    Exception type: IndexOutOfRangeException
    Exception message: Days
 
Request information:
    Request URL: http://utopia/LatestCallSheet/Manageranges.net/server.aspx?type=save&userid=451810&fee=&username=&ic=&statusid=6&callback=&mob=07877300589&rand=8075&rand=39267 
    Request path: /LatestCallSheet/Manageranges.net/server.aspx
    User host address: 192.168.2.11
    User:  
    Is authenticated: False
    Authentication Type:  
    Thread account name: DOMAIN\Admin
 
Thread information:
    Thread ID: 11
    Thread account name: DOMAIN\Admin
    Is impersonating: False
    Stack trace:    at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName)
   at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
   at System.Data.SqlClient.SqlDataReader.get_Item(String name)
   at server.Page_Load(Object sender, EventArgs e) in c:\Inetpub\wwwroot\LatestCallSheet\Manageranges.net\server.aspx.cs:line 228
   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
 
 
Custom event details:

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.