risolto!

codice:
Sub Page_Load(obj as object, e as eventArgs)
strRegione = replace(Request.QueryString("strRegione"),"'","''")
.....
End Sub

.....

<MAP NAME="Italia_Map">
<AREA SHAPE="poly" ALT="Sardegna" COORDS="55,167,.... 
HREF="PisteIta.aspx?StrRegione=Sardegna" runat="server"/>