smuthu says:
<
input
type
=
"submit"
runat
=
"server"
name
=
"btnPrint"
value
=
"Print"
id
=
"btnPrint"
class
=
"btn btn-primary btn-block btn-large"
onclick
=
"return btnPrint_onclick()"
onclick
=
"return btnPrint_onclick()"
/>
replace above code with below
<input type="submit" runat="server" name="btnPrint" value="Print" id="btnPrint" class="btn btn-primary btn-block btn-large"
onclick="return btnPrint_onclick()" />