Hi thanks for reply but by mistake i click on Submit button before i complete my question. Your link is not fix excatly my case
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Just completing my post as i cant edit after i post it so i will complete it here:
I have tried to use Facebook share button into my page but the share box showing error message: " Object reference not set to an instance of an object. " , the page domain is change depending on query string where is changed depending on each Ad like below examples
http://www.berava.com/AdsDetails.aspx?AID=118&ATI=Retail%20For%20Lease,%2014,400%20SF....
http://www.berava.com/AdsDetails.aspx?AID=115&ATI=CERTIFIED%202013%20LINCOLN%20MKX%20FWD...
And into my page i have include below Facebook JS and Facebook html button
<script>(function (d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.6";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
<div class="col-lg-12" style="float:right;">
<div class="col-3 pull-right">
<div class="fb-share-button" data-href="" data-layout="button" data-mobile-iframe="true"></div>
</div>
<div class="col-3 pull-right" style="padding-left:13px; padding-right:13px;">
<asp:LinkButton ID="likebtn" runat="server" OnClick="likebtn_Click" CausesValidation="false" ToolTip="Add this Ads to your favorite list"><i class="fa fa-star fa-lg" style="color:Orange;"></i></asp:LinkButton>
</div>
<div class="col-6 pull-right">
<asp:LinkButton ID="Sndmailtoadder" runat="server" OnClick="Sndmailtoadder_Click" CausesValidation="false" ToolTip="Send message to ads owner"><i class="fa fa-envelope fa-lg" style="color:#a50061;"></i> Contact Seller</asp:LinkButton>
</div>