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just like you, helping each other. Join them; it only takes a minute: Sign up The entry '' has already been added error up vote 49 down vote favorite 7 I have a web.config in ASP.net giving me configuration error. ... It throws "The entry 'conn2' has clear in web config already been added." error. I know I only added it once. Not sure what it is wrong with. asp.net share|improve this question asked Jul 13 '11 at 12:56 Tony 1,10493560 There should be a line number that is spewed out with the error. Have you checked that it corresponds with the snippet you have above? Are you sure you haven't got another parameter named "conn2"? –Nicolas Jul 13 '11 at 13:00 I'm assuming you're using a database? MSSQL, mongoDB, something else? Have you set a unique field to uid or pwd fields in the DB? This would create a duplicate entry for that field and depending on the DB (each have their own error terminology) being used could spit this error. I hope this helps –Ryan Jul 13 '11 at 13:01 1 Check you web.config, you must have defined conn2 somewhere else; otherwist it will not error out. Well I just tested adding those given connection string to my test web.conf

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Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: a configuration for type has already been added Sign up ASP.Net/web.config - “The entry 'x' has already been entered”? up vote 4 down vote favorite 1 In ASP.Net when I see the error message "The entry 'x' has already been entered" I think that means a name (in this http://stackoverflow.com/questions/6679233/the-entry-has-already-been-added-error case 'x') is defined twice in Web.Config. Is that a reasonable summary of what causes that error or are there other ways it could be generated ? The 'x' in question doesn't appear twice in the web.config - any ideas of what else could be causing this error ? asp.net web-config share|improve this question asked Sep 26 '10 at 22:46 glaucon 1,72541939 add a comment| 4 Answers 4 active oldest votes up vote 11 down vote If you have nested web.config files, the http://stackoverflow.com/questions/3800140/asp-net-web-config-the-entry-x-has-already-been-entered same connection string entry in both web.config files can cause this error. You can fix this by adding a tag in the nested web.config file like so: share|improve this answer answered Feb 2 '11 at 20:23 James Lawruk 15.4k128896 I am using VB.NET, and tried that, but after debug, it omits my changes, why? –AdorableVB Feb 22 '14 at 6:57 add a comment| up vote 5 down vote It could be you have nested Web.configs. If you're running more than one application out of the same directory hierarchy you might see this. For example, say you've got IIS pointed at the root of some directory, but inside that directory is a folder with another app in it and you have a vdir pointed to that app - well you may indeed run in to this problem as ASP.Net will parse the web.config at the root first, and then the web.config for the application the vdir points to. share|improve this answer answered Sep 26 '10 at 22:57 Eric 2,42511423 add a comment| up vote 1 down vote +1 to Erics answer. Also if you upgrade web projects (i.e. from VS 2008 to VS 2010) the web.config file it keeps for you in the backup folder will cause this error for the same reason. share|improve this answer answered Sep 27 '10 at 0:13 BrokenGlass 113k9199253 add a comment| up vote 0 down vote I've seen this happen where t

Framework > .NET Framework Setup and Servicing Question 0 Sign in to vote https://social.msdn.microsoft.com/Forums/vstudio/en-US/23d02d5d-92b8-4a1e-9ea0-74b5c8b89e8c/webconfig-and-the-entry-key-has-already-been-added?forum=netfxsetup My connection string of my web app (.net 2.0)  is http://www.telerik.com/forums/configuration-error-the-entry-xxxx-has-already-been-added in the web.config:    Everything was working fine until i got this error messageSystem.Configuration.ConfigurationErrorsException: The entry 'KEY' has already been added. (...path...\web.config line 14)To solve the problem, i added  a before the .My question is: The key isn't has already anywhere else in the project, except in the web.config. How can it be duplicated? Friday, December 15, 2006 11:06 AM Reply | Quote Answers 1 Sign in to vote .NET has several configuration files and they are all merged together. Your KEY is already defined in some other config file. 

Friday, March has already been 23, 2007 3:34 PM Reply | Quote Moderator All replies 0 Sign in to vote Could you tell us the name of the key for the collection item. Also, are you using a connection object that maps to the configuration file, on compilation time maybe it's adding the key to the list. Tuesday, December 19, 2006 2:32 AM Reply | Quote 0 Sign in to vote The KEY is "OGPCnString".>>are you using a connection object that maps to the configuration file, Didn't get the question, but this is what i'm doing:string cn = ConfigurationManager.ConnectionStrings["OGPCnString"].ConnectionString;new SqlConnection(cn);The exception is thrown in  ConfigurationManager.ConnectionStrings["OGPCnString"].ConnectionStringThanks. Tuesday, December 19, 2006 10:21 AM Reply | Quote 1 Sign in to vote .NET has several configuration files and they are all merged together. Your KEY is already defined in some other config file. 

Friday, March 23, 2007 3:34 PM Reply | Quote Moderator 4 Sign in to vote <

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