title: filling combo box using LINQ query (distinct)
body: <p>I have a combocox the name is "cmbModel" I want to fill the database with two different values in a table.
  This is what I have done:</p>
  
  <pre><code>private void Form1_Load(object sender, EventArgs e)
          {
              using (LINQSQLDataContext db = new LINQSQLDataContext())
              {
                  cmbModel.DisplayMember = "szModel";
                  cmbModel.DataSource = db.VehEcus.ToList&lt;VehEcu&gt;();
              }
          }
  </code></pre>
  
  <p>this will fill my cmbModel with szModel column of my table but I want to avoid repeating , how can I use "<code>distinct</code>" in query to achieve my goal?
  and also I want to show 2 items of my table like "<code>modelID-szModel</code>" in my combobox</p>
  
  <p>Thanks</p>