I am using the following select statement and its giving error when i execute
it, whats the wrong in this expression?

<xslt:value-of
select="/NewDataSet/Table2[GroupVal=key('NewDataSet',sAssignedUser)/sAssignedUser]/GroupCount"/>

My Intention is the "/NewDataSet/Table2[GroupVal=' ']/GroupCount" expression
should return a value based on the other expression i.e
"key('NewDataSet',sAssignedUser)/sAssignedUser" .

can any give me the suggestions in this....
Advance Thanks to all.

I can't see anything wrong with it, but then I don't have the luxury of knowing what the error message said.

(Always post the error message. Just because you don't understand it doesn't mean that no-one else will)

It's possible you've got a context problem. You haven't shown your XML source either. Does Table2 have a child element called sAssignedUser? If not, the call on key() won't select anything.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference