How to convert PHP code into C#

[Satyareddy]

<image url='charts.swf?library_path=charts_library&xml_so urce=ts.php%3Fcat%3D"; print $category; print $category"; print $category; print "' />

This is php code i want to convert it into c#.
this code i write in c# like

<image url='charts.swf?library_path=charts_library&xml_source=ts.aspx?cat=<%=category %> '><% Response.Write(category);%></image>;

but it is not providing output

here category =Request.Query String["category"]


Please solve my problem