title: Verify if a column exist in a DataTable
body: <p>I need to update an item in a DataTable only if a column exist.<br>
  I've tried to write this, but it doesn't work because the column "carta_sistemata" doesn't exist.     </p>
  
  <pre><code>If table.Rows(0).Item("column_name") IsNot Nothing Then
      TextBox.Text = table.Rows(0).Item("column_name").ToString
  End If
  </code></pre>
  
  <p>Without the "if" the code works, but if the column doesn't exist it throws an exception.</p>
  
  <pre><code>TextBox.Text = table.Rows(0).Item("column_name").ToString
  </code></pre>