title: what is session concept in web service? and how to implement
body: <p>I have a problem in session concept of asp.net web services, how to implement in a application?</p>
  
  <p>and also i have a problem in eval in asp.net actually what is the use of eval</p>
  
  <pre><code>&lt;asp:ImageButton ID="imgbtnDelete" ImageUrl="~/cpanel/images/icons/table/actions-delete.png"
         runat="server" CommandArgument='&lt;%#Eval("JobID")%&gt;' OnClick="imgbtnDelete_Click"&gt;
  </code></pre>