.Net Beginners : How to associate an asp:Label with a TextBox or other Form control?

To associate an asp:Label to From controls means , when clicking on asp:Label cursor focus move to that associate controls.

 Example:
In web form there is label and text box, this label is associated with textbox so when click on label cursor focus move to text box.

<asp:Label runat="server" ID="lblProductName" Text="Product Name :" AssociatedControlID="txtProductName"></asp:Label>
<asp:TextBox runat="server" ID="txtProductName"></asp:TextBox>