Hi,
SYMPTOMS
In Microsoft Office FrontPage 2003, when you open an .aspx page in Design
view, you may receive the following error message:
Error - Parser Error: Unknown Server Tag 'TagName'.
The placeholder for the user control does not appear as expected on the
page.
CAUSE
This problem occurs if the .aspx page contains one or more user controls
that are located in <asp

anel></asp

anel> tags. FrontPage 2003
incorrectly detects user controls that are located in
<asp

anel></asp

anel> tags.
WORKAROUND
To work around this problem, replace the <asp

anel></asp

anel> tags that
contain user controls in the .aspx page with <div></div> tags. The
<asp

anel> tag is rendered as an HTML <div> element. To replace the
<asp

anel></asp

anel> tags in the .aspx page with <div></div> tags:
Open the Web page that you want to modify.
At the bottom of the page, click Code.
On the Edit menu, click Find.
Click the Replace tab.
In the Find what box, type <asp

anel>.
In the Replace with box, type <div>, and then click Replace. Replace all
<asp

anel> tags that contain a user control.
In the Find what box, type </asp

anel>.
In the Replace with box, type </div>, and then click Replace. Replace all
</asp

anel> tags that contain a user control.
On the File menu, click Save.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products
that are listed in the "Applies to" section.
MORE INFORMATION
FrontPage 2003 does not support design-time preview of user controls. When
you view an .aspx page in Design view and the Web page contains one or more
user controls, a box that contains the tag prefix and the tag name appears
as a placeholder for the user control. However, if the user control is
located in <asp

anel></asp

anel> tags, FrontPage 2003 does not correctly
detect the user control, and you experience the symptoms that are described
earlier in the "Symptoms" section.
For more information about FrontPage 2003, visit the following Microsoft
Web site:
http://www.microsoft.com/office/frontpage/prodinfo/default.mspx
For Further Information : Microsoft Knowledge Base Article - 838090
http://support.microsoft.com/default.aspx?scid=kb;en-us;838090
Please let me know has this helped You...
Thank you...
Raghu...
This posting is provided "AS IS" with no warranties, and confers no rights.