The entry ” has already been added error

by

it can be in web.config that is parent to this one. just add

<remove name="conn2" />

before your add it (again) 🙂

alternatively clear all connection string using

<clear />

More Related Contents:

  1. Content-Disposition:What are the differences between “inline” and “attachment”?
  2. Session timeout in ASP.NET
  3. Self Tracking Entities vs POCO Entities
  4. Best way to trim strings after data entry. Should I create a custom model binder?
  6. What is the equivalent of Server.MapPath in ASP.NET Core?
  7. System.Security.SecurityException when writing to Event Log
  8. Request is not available in this context
  9. ASP.NET 4.5 MVC 4 not working on Windows Server 2008 IIS 7
  10. What perfmon counters are useful for identifying ASP.NET bottlenecks?
  11. Prevent HTML encoding in auto-generated GridView columns
  12. Visual Studio error “Object reference not set to an instance of an object” after install of ASP.NET and Web Tools 2015
  13. Setting up redirect in web.config file
  14. ASP.NET Ajax client-side framework failed to load. when put the ScriptManager on a blank page
  15. How to run ‘dotnet dev-certs https –trust’?
  16. The anti-forgery cookie token and form field token do not match in MVC 4
  17. Cannot use a leading ../ to exit above the top directory
  18. Jqgrid 3.7 does not show rows in internet explorer
  19. What is the purpose of the Assemblies node in Web.Config?
  20. “The page you are requesting cannot be served because of the extension configuration.” error message
  21. How to combine using Membership API with own application related data?
  22. How do I fix a “Request format is unrecognized for URL…” error in a web service running in IIS?
  23. SQL Reporting Services – Print Button not shown in Mozilla
  24. “StartTag: invalid element name” in default.aspx
  25. Cache VS Session VS cookies?
  26. What is an HttpHandler in ASP.NET
  27. Asp.Net MVC3, returning success JsonResult
  28. How can I encrypt a querystring in asp.net?
  29. IIS AAR – URL Rewrite for reverse proxy – how to send HTTP_HOST
  30. Default redirect for Error 404

Leave a Comment