Question

Given this entity model variable:

DataBaseEntities db = new DataBaseEntities ();

The below code can not use from db varibale connection string

SqlBulkCopy sbc = new SqlBulkCopy(db.Connection.ConnectionString);

Answer 1

try with this approach:

private string GetADOConnectionString()
{
    var db = new DataBaseEntities();

    EntityConnection ec = (EntityConnection)db.Connection;

    return ec.StoreConnection.ConnectionString;
}

I’ve found this here: Getting SqlConnection from EntityConnection

also see here: EntityConnection.StoreConnection Property

Edit: of course this should be adapted and you should check for nulls or check before casting… it’s just an example 😉