When executing EF operation,
no connection string named ‘testentities’ could be found in the application config file error

solution:
it is necessary to add configuration in app.config of the application

1  <connectionStrings>
2  <add name="TestEntities" 
3 　　　　　connectionString="metadata=res://*/TestData.csdl|res://*/TestData.ssdl|res://*/TestData.msl;
4  　　　　　　provider=MySql.Data.MySqlClient;provider connection string=&quot;
5 　　　　 　　server=localhost;user id=root;
6  　　　　　　password=admin;persistsecurityinfo=True;database=test&quot;"
7 　　　　　providerName="System.Data.EntityClient" />
8  </connectionStrings>

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