Entities’ does not contain a constructor that takes 1 arguments

public class Connection
{
    public static string GetConecction()
    {
        return ConfigurationManager.ConnectionStrings["DCAssetEntities"].ConnectionString;
    }
}

I have one “connection” class to configure my web with Entity framework model Entities

public class ConnectionDAL
{
    private DCAssetEntities db;

    public ConnectionDAL()
    {
        db = new DCAssetEntities(Connection.GetConecction());
    }
}

then I intialize my database in “ConnectionDAL” class constructor,, It’s working good in Visusal Studio 2010 but in visusal Studio 2012 showing Error “DC_Asset_Maintenance.DAL.DCAssetEntities’ does not contain a constructor that takes 1 arguments
“

Answers:

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Method 1

Your class DCAssetEntities needs to have a constructor with the following definition.

public DCAssetEntities(string connectionString){}

Method 2

Make the constructor yourself in a partial class:

public partial class DCAssetEntities: DbContext
{
    public DCAssetEntities(string connectionstring)
        : base(connectionstring)
    {
    }
}

Related question:
Entity Connection String Constructor not found in EF 5 and WCF 4.5 at runtime

Method 3

You need to mark the constructor as public (or internal).

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