Connectionstring in MVC4 - asp.net-mvc-4

Question

I am doing mvc practice and create a simple page for fetch data from database. During practice I notice one thing I create this class:
public class EmployeeContext : DbContext
{
public DbSet<Employee> Employees { get; set; }
}
And in my web.config First I add this detail:
<connectionStrings>
<add name="con" connectionString="Server=XYZ;Database=mvc1;uid=sa;pwd=abcd;" providerName="System.Data.SqlClient"/>
</connectionStrings>
When I run this application it give me error that there are invalid columns name.
But after that I read about it on internet and I change the con to EmployeeContext the name of the class that I create and then its work fine. Like this:
<connectionStrings>
<add name="EmployeeContext" connectionString="Server=XYZ;Database=mvc1;uid=sa;pwd=abcd;" providerName="System.Data.SqlClient"/>
</connectionStrings>
Now I want to know for the now I create just one single simple class and I have to give the class name in the connection string. Then is there this mean that I have to create everytime new connection string for each class???
Thanks

Answer 1

For sample you have different class model :
namespace MvcMusicStore.Models
{
public class Artist
{
public int ArtistId { get; set; }
public string Name { get; set; }
}
}
namespace MvcMusicStore.Models
{
public class Album
{
public int AlbumId { get; set; }
public int GenreId { get; set; }
public int ArtistId { get; set; }
public string Title { get; set; }
public decimal Price { get; set; }
public string AlbumArtUrl { get; set; }
public Genre Genre { get; set; }
public Artist Artist { get; set; }
}
}
using System.Collections.Generic;
namespace MvcMusicStore.Models
{
public partial class Genre
{
public int GenreId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public List<Album> Albums { get; set; }
}
}
After that you have to adding App_data folder is a special directory in ASP.NET which already has the correct security access permissions for database access. From the Project menu, select Add ASP.NET Folder, then App_Data.
After you create a new connection strings:
<connectionStrings>
<add name="MusicStoreEntities"
connectionString="Data Source=|DataDirectory|MvcMusicStore.sdf"
providerName="System.Data.SqlServerCe.4.0"/>
</connectionStrings>
</configuration>
and then a class covering the different DbSet your Application :using System.Data.Entity;
namespace MvcMusicStore.Models
{
public class MusicStoreEntities : DbContext
{
public DbSet<Album> Albums { get; set; }
public DbSet<Genre> Genres { get; set; }
}
}
If you want to create a new class you have just to put on the DbSet into the last class.
You can find all the details here : http://www.asp.net/mvc/tutorials/mvc-music-store/mvc-music-store-part-4