Enchanced Button
Each of the properties of the Enchanced Button control can be used in combination with each other to achieve the required action. Below you will find a demostration and ASP.net code.

Confirmation Message
If behind your button, your code execute some irreversible tasks, you should want to display a confirmation message box before validation the click. The property PopupMessage when containing a message, generates the popup for you.
<i386:EnchancedButton id="EnchancedButton3" runat="server" Text="Submit" ClickOnce="true" ConfirmationMessage="Are you sure?"/>

Click Once
Prevent a web user from clicking the button more than once.
<i386:EnchancedButton id="EnchancedButton2" runat="server" Text="Click Once" ClickOnce="True" />

private void EnchancedButton2_Click(object sender, System.EventArgs e)
{
Thread.Sleep(1000);
}

Navigate Url
Complete the click event and forward to another URL.

<i386:EnchancedButton id="EnchancedButton1" ConfirmationMessage="Move to the homepage." ClickOnce="true" runat="server" Text="Next"NavigateUrl="/default.aspx" />


<i386:EnchancedButton id="ClickOnceButton1" runat="server" Text="Next" NavigateUrl="/default.aspx" />