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C# Entity Framework Basics Entity Framework and Databases Changing the Database Name

purva mishra
PLUS
purva mishra
Courses Plus Student 125 Points
Posted by purva mishra
purva mishra
Courses Plus Student 125 Points

In App.config set the "Context" database connection string's Data Source value to the SQL Server LocalDB default instanc

In App.config set the "Context" database connection string's Data Source value to the SQL Server LocalDB default instance name.,

i have set the datasource value to (localdb)\MSSQLLocaldb , still its throwing me error : (did you include suffix (localdb)

App.config 
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
  </startup>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
  <connectionStrings>
    <add name="Context" 
         connectionString="Data Source=(localdb)\MSSQLLocaldb;Initial Catalog=;Integrated Security=True;MultipleActiveResultSets=True" 
         providerName="System.Data.SqlClient"/>
  </connectionStrings>
</configuration>

3 Answers

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

The instance name is case-sensitive.

You wrote "MSSQLLocaldb" (little "db") instead of "MSSQLLocalDB" (capital "DB").

S.Amir Nahravan
S.Amir Nahravan
4,008 Points
S.Amir Nahravan
S.Amir Nahravan
4,008 Points

I think you have to write (localdb)\MSSQLLocalDB

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

Wow, what a long-delay echo there is in here! :smirk:

Asaad Khattab
Asaad Khattab
38,121 Points
Asaad Khattab
Asaad Khattab
38,121 Points

You forgot to capitalize DB => MSSQLLocalDB

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
  </startup>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
  <connectionStrings>
    <add name="Context" 
         connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=;Integrated Security=True;MultipleActiveResultSets=True" 
         providerName="System.Data.SqlClient"/>
  </connectionStrings>
</configuration>