2 databases with the same name exist in web.config

Question

I've got a problem connecting to my Database. I get this error

An attempt to attach an auto-named database for file C:\Users\Visual Studio 2013\WebSites\RegisterDb\App_Data\RegisterDb.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

Here is my web.config

<configuration>
   <connectionStrings>
      <add name="ConnectionString" connectionString="Data 
         Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\RegisterDb.mdf;Integrated 
                 Security=True;User Instance=True" 
                 providerName="System.Data.SqlClient" />
      <add name="DdExamen2ConnectionString" connectionString="Data Source=
        (LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\RegisterDb.mdf;Integrated Security=True"
        providerName="System.Data.SqlClient" />
   </connectionStrings>

here is the Register.designer.cs

[global::System.Data.Linq.Mapping.DatabaseAttribute(Name="RegisterDb")]
public partial class RegistersDataContext : System.Data.Linq.DataContext
{

private static System.Data.Linq.Mapping.MappingSource mappingSource = new 
        AttributeMappingSource();


       base(global::System.Configuration.ConfigurationManager.ConnectionStrings
           ["ConnectionString"].ConnectionString, mappingSource)

I don't see what I am missing?

When I am looking at the Registers.dbml file, I saw the Connection : RegisterConnectionString(WebConfig) and the connection String is Data Source=(LocalDb).... I am pretty sure this is the problem. Anyone know how to recreate the ConnectionString ?

I saw 2 files in the web.config file for the connectionString ? What I did wrong?

Answer 1

You have used 2 connection strings. Remove one of them. Most probably the second connection string should b deleted. as you are working on your own machine and .\\SQLEXPRESS is simplest way to connect to your server. Remove the second one....

Answer 2

If you use a connection string in you application, use the same one for all connections to the same database.

remove

  <add name="DdExamen2ConnectionString" connectionString="Data Source=
    (LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\RegisterDb.mdf;Integrated Security=True"
    providerName="System.Data.SqlClient" />