Build Your Own ASP.NET 2.0 Web Site Using C# & VB, Second Edition

ValidationSummary

Imagine we have a form that contains many form fields. If that page contains

errors, it could be difficult for users to figure out which control caused a given

error, because the page is so big. The ValidationSummary control can alleviate

this problem by presenting the user with a list of error messages in one place on

the page. Let’s see the ValidationSummary control in use. Add it to the end of

your Login.aspx file, like so:

File: Login.aspx (excerpt)

<!-- Submit Button -->

<p>

<asp:Button id="submitButton" runat="server" Text="Submit"

OnClick="submitButton_Click" />

</p>

<!-- Validation Summary -->

<p>

<asp:ValidationSummary id="vSummary" runat="server" />

</p>

When the user clicks the Submit button, the ValidationSummary is populated

automatically with a list of all the errors on the page, as we can see in Figure 6.7.

Figure 6.7. Using the ValidationSummary control

235

ValidationSummary