ASP.NET

<asp:TemplateField>
                                   <ItemTemplate >
                                       <asp:ImageButton ID="ImageDeleteBuyingKala" ImageUrl="~/ServerFile/ApplicationFiles/Icons/Button/add.png"
                                          Width="25" runat="server" OnClientClick="Open('<%# Eval("Id") %>')" />
                                   </ItemTemplate>
                               </asp:TemplateField>

<script type="text/javascript">
       function Open(IdItem) {
           // to handle in IE 7.0
           if (window.showModalDialog) {
               window.showModalDialog(location.protocol + "//" + location.host + "/" + "WorkFlows/Forms/BuyingKala/Estelam.aspx?Id=" + IdItem, "Show Popup Window", "dialogHeight:450px,dialogWidth:80%,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,modal=yes,center:yes");
           }
           // to handle in Firefox
           else {
               window.open(location.protocol + "//" + location.host + "/" + "WorkFlows/Forms/BuyingKala/Estelam.aspx?Id=" + IdItem, "Show Popup Window", "height=450px,width=80%,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,modal=yes,center:yes");

           }
          // window.showModalDialog(location.protocol + "//" + location.host + "/" + "WorkFlows/Forms/BuyingKala/Estelam.aspx?Id=" + IdItem, null, "height=290px,width=400px,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,modal=yes")
       }
   </script>

<ItemTemplate>
                                        <asp:ImageButton ID="ImageEstelamBuyingKala" ImageUrl="~/ServerFile/ApplicationFiles/Icons/Button/add.png"
                                            Width="25" runat="server" OnClientClick='<%# " Open("+ DataBinder.Eval(Container.DataItem,"Id") + ");" %>' />
                                    </ItemTemplate>