Server Error in '/' Application.

Item has already been added. Key in dictionary: 'ב'  Key being added: 'ב'

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.ArgumentException: Item has already been added. Key in dictionary: 'ב'  Key being added: 'ב'

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>


or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>


Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:


[ArgumentException: Item has already been added. Key in dictionary: 'ב' Key being added: 'ב'] System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +9356587 System.Collections.Hashtable.Add(Object key, Object value) +11 System.Collections.Specialized.StringDictionary.Add(String key, String value) +60 Habama.ListWithLetters..ctor() +856 ASP.controls_listwithletters_ascx..ctor() +13 ASP.pages_artperson_aspx.__BuildControlListLet1() +25 ASP.pages_artperson_aspx.__BuildControlmyform() +418 ASP.pages_artperson_aspx.__BuildControlTree(pages_artperson_aspx __ctrl) +26 ASP.pages_artperson_aspx.FrameworkInitialize() +44 System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +54 System.Web.UI.Page.ProcessRequest() +78 System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21 System.Web.UI.Page.ProcessRequest(HttpContext context) +49 ASP.pages_artperson_aspx.ProcessRequest(HttpContext context) +4 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272