Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

That’s my namespaces. I was looking for System.Data.Linq; but it doesn’t seem to be anywhere, and I guess that is what have been moved to System.Linq, since I have access to most other things in Linq. I’ve found System.Data:Linq, but no difference.

Here is my method:

public void deleteStudienummer(int studienummer)
{
    dbcontent = new DBEntities();

    var dQry = from members in dbcontent.Medlemmer
               where members.Studienummer == studienummer
               select members;

    foreach (var member in dQry)
    {
        dbcontent.***
    }
    dbcontent.AcceptAllChanges();
    Console.WriteLine("delete member should have occured");
}

The *** was supposed to be DeleteOnSubmit, but I only have DeleteDatabase and DeleteObject, I tried the latter but it doesn’t work.

Have also tried dbcontent.Medlemmer.* but still not present.

And AcceptAllChanges() was supposed to be .submitChanges() but that wasn’t present either.

Answer 1

As far as I know DeleteOnSubmit can only be called from a ‘Table’ not from a DataContext. Looks like you’re trying to call DeleteOnSubmit from the context.

Should be dbcontent.Medlemmer.DeleteOnSubmit(member);

When using Linq to Entities as in this case dbContent.DeleteObject(member) can be used to mark for deletion. After that dbContent.SaveChanges() needs to be called to apply the changes. (AcceptAllChanges() won’t do the deletion).