title: Check if item is in a combobox list
body: <p>I am dynamically populating a winforms combo box by creating a list from a database.  </p>
  
  <pre><code>List&lt;string&gt; locationList = new List&lt;string&gt;();
  
          foreach(Data.DataSet.vwGet_RepListRow row in Data.Manager.TAM.RepListViewTableAdapter.GetData())
             locationList.Add(row.Location_City);
  
          this.LocationComboBox.DataSource = locationList;
  </code></pre>
  
  <p>The issue I am having is that there are right now a total of 3 locations but 65 employees so what is happening is I am getting cities repeated in the combo box.  How can I edit this above to check if the new Location_City is not already present in the locationList?  If it is not there, then add it but if it is there, then skip it. </p>
  
  <p>Any help would be great. </p>