As I can see you are using:
The "#" symbol is not valid XHTML. You can escape it and have your anchor tag like this
|<a href="%23">Your text</a>
This is working just fine.
Regarding your other questions:
I suggest you visit the RadGrid export section
in our online help. You can use IgnorePaging
property to specify whether all records will be exported or merely those on the current page. Find the rest of the properties listed in the linked article.
the Telerik team
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