Beginning ASP.NET 3.5: In C# and VB

A.14. Chapter 14

A.14.1.

A.14.1.1.

A.14.1.1.1. Exercise 1 solution

The Load event of the Page always fires before user-triggered events like a Button control's Click.

A.14.1.1.2. Exercise 2 solution

To alternate the odd and even rows you need to set up a RowStyle and an AlternatingRowStyle. You then need to set their respective BackColor and ForeColor properties:

<asp:GridView ID="GridView1" runat="server" ... >
  <AlternatingRowStyle BackColor="White" ForeColor="Black" />
  <RowStyle BackColor="Black" ForeColor="White" />
  <Columns>
    ... Column definition here
  </Columns>
</asp:GridView>

Remember that embedding style information like this can lead to page bloat and results in pages that are difficult to maintain. Moving the style definition to a separate CSS file and using the CssClass of the styles would be a much better solution. Your CSS file should contain these selectors:

.AlternatingRowStyle
{
  background-color: white;
  color: black;
}

.RowStyle
{
  background-color: black;
  color: white;
}

With these CSS selectors you need to modify the GridView styles as follows:

<AlternatingRowStyle CssClass="AlternatingRowStyle" />
<RowStyle CssClass="RowStyle" />

A.14.1.1.3. Exercise 3 solution

The various data-bound controls can raise exceptions that you can handle in their event handlers. Once you have dealt with the exception appropriately, you need to set the ExceptionHandled property of the e argument to True. The following code snippet shows how a Label control is updated with an ...