title: how to add 2 column value of table field in dropdown
body: <p>I have a  dropdown. I need to bind with two field of datatable value 
   here</p>
  
  <pre><code>ddlitem.datasource= dtitem
  ddlitem.datatextfield = dtitem.cloumn["name"].tostring()+"-"+dtitem.cloumn["tagname"].tostring() 
  </code></pre>
  
  <p>I am doing like this I am getting exception here. How can I combine both the column value in  dropdown</p>
  
  <p><strong>and when I retrieve the selected value of the dropdown</strong> </p>
  
  <p>I should get only the value of this column value: <code>dtitem.cloumn["name"].tostring()</code></p>
  
  <pre><code>string stritem=  ddlitem.selecteditem.Text.Tostrigng();
  </code></pre>
  
  <p>so how can I do the splitting the value of the string?</p>