title: DataTable select distinct values from several columns
body: <p>as allways i need your help :)</p>
  
  <p>i got a <code>DataTable</code> which has the following columns:</p>
  
  <p><code>TITLE ADDRESS BRANCH BRANCH1 BRANCH2 BRANCH3</code></p>
  
  <p>since i dont want to execute another MySql query to get only the branches,
  i figured i can do a <code>LINQ</code> query on the <code>DataTable</code> and get distinct values.</p>
  
  <p>boy, i was wrong... its not as simple i thinked it will be.</p>
  
  <p>anyone can help me with this ? ( Lambda expression prefered )</p>
  
  <p>edit:</p>
  
  <p>if i wasnt clear, i need all the branches, from all the rows.</p>