Question

Please do not give me help in lamba

I have two tables. 
Employees:   
pk           
name        

ExpenseTeamMembers: 
pk                        
expMgrPk
empPk

Example: pk      expMgrPk     empPk     
     1         7          81
     2         7          101
     3         13         99
     4         13         22
     5         13         56

Basically the first table is a list of employees and the second is a table for keeping track of which employees belong to which manager.

The first sql lookup works and mgr is getting me the pk of the selected name in the combo box.

What I am trying to do in the join is lookup the expMgrPk and see which employees belong to it and return their names instead of their pk. I am pretty off and need a little help. Again please do not give me help in lamba!! Thanks

    private void cboManagers_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (cboManagers != null)
        {
            string selectedMgr = (string)cboManagers.SelectedValue;

            using (DataClasses1DataContext db = new DataClasses1DataContext())
            {
                int mgr = (from f in db.employees
                          where f.name == selectedMgr
                          select f.pk).FirstOrDefault();

                var emps = (from m in db.employees
                            join t in db.expenseTeamMembers on m.pk equals t.pK
                            where t.expMgrPk == mgr
                            select m.name).ToList();
                lstSelected.DataSource = emps;
            }
        }
    }

Answer 1

In linq-to-sql, you can write joins more easily by writing two from statements combined with a where statement. Something like this:

var emps = (from f in db.employees
            from m in db.expenseTeamMembers
            where m.pk == mgr && f.pk == m.empPk
            select f.name).ToList();

I’ve found this syntax to be easier and when your code is compiled, the query is converted to a traditional T-SQL join.