How to remove all rows of the table but keep the header

Try http://api.jquery.com/child-selector/

$("#<%=tblDetailFourn.ClientID%> > tbody > tr").remove();

What you have should work though.

$('#tblDetailFourn tbody').empty();

Try using this:

$('#<%=tblDetailFourn.ClientID%> tr').not(function(){ return !!$(this).has('th').length; }).remove();

What about:

$('#tblDetailFourn tbody').html('');

jsfiddle

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