Conditional base style in Gridview using Eval() Method.

<a href=’Receipt.aspx?Id=<%#Eval(“RecNo”) %>&TravellerId=<%#Eval(“StID”) %>’ onclick=”window.open(this.href,’targetWindow’,
‘toolbar=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=500,
height=600′);return false;”
style=’display:<%#(Eval(“RecNo”).ToString())!=”” ? “block”: “none” %>’>View Receipt</a>