title: Update textbox via onchange event of a dropdownlist while editing in gridview
body: <p>I am trying to update a TextBox within currently edited row within a GridView on when changing items on a DropDownList and I cant quite get it going in VB. I found this code in c# but don't know if I'm on the right track?</p>
  
  <p>Can you please offer some help?</p>
  
  <p>PS: This code is for an <code>OnMouseOver</code> event but the point is to update the TextBox while in edit mode.</p>
  
  <pre><code>&lt;ItemTemplate&gt;
      &lt;asp:TextBox runat="server" ID="tx1" onmouseover='&lt;%# "ChangeValue(" +((DataGridItem)Container).FindControl("tx1").ClientID + ")"%&gt;'&gt;&lt;/asp:TextBox&gt;
  &lt;/ItemTemplate&gt;
  </code></pre>
  
  <p>JS Code:</p>
  
  <pre><code>function ChangeValue(i)
  {
      var t=i.id
      document.getElementById(t).value="Hello World!";
  }
  </code></pre>