Among Other Controls MyPage also contains a SropDown List and
a Hyperlink.
When A user Slects an item from the list and Clicks the Hyprlink, a
new Page is displayed.
What i want is to display the new page as soon as the user selects an item from the DropDownlist.

In the Home Page of this Forum there is a DropDownlist at the Bottom Right of the Page

                        Jump to Forum
As soon as I select an item from the List the new page gets
displayed.
This is what I want with my Page

If the solution to my problem is Posting to new Page using Forms
then please advise me some help links on that topic

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All you need to do is turn set AutoPostback to "True" on the dropdownlist control. This will make the Html <select> control fire the form post when it's "onChange" client event is called. Just the same way as the "Jump To:" selector on this site works. However, ASP.Net handles creating the javascript for you. You need only set that attribute to turn it on.

<asp:dropdownlist Runat="server" ID="dropdownlist1" AutoPostBack="True" />

Peter
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Work smarter, not harder

You can then catch the change on the server side via the SelectedIndexChanged event.