I have Client-Side button event. After click call sgnPdf(ID) if I can sign PDF.[MyForm.aspx]\[code\] <script type="text/javascript"> <% if (ViewData.CanSignPdf){ %> $(function() { $("#<%=btnSend.ClientID %>").click(function() { if ($('.IgnoreCheckBox').is(':checked')) { sgnPdf(<%=ViewData.NoticeID %>); return false; }; }); }); <% } %></script>\[/code\]But I need call this function from Server side after button click.[MyForm.aspx.cs]\[code\] protected void BtnSendClick(object sender, EventArgs e) { FormUnbindData(); SaveMYData(); //Here i want call client function sgnPdf(ID). How can I do this? ShowMyMessage(); }\[/code\]OK, you need to do just simply. For example call alert("message") in there.