I have a page on my website that is used to get information from my user and then submit this information to a different website.  The fields that the user enters data into are 'input' fields.  In addition to the information that the user enters, I need to be able to include additional information.  This additional information is contained in a 'session' variable.  I have included a hidden input field on my form to accomodate this additional information but I do not know how to set the value of this hidden input field to the session variable.

 HiddenField1.Value = Convert.ToString(Session["somexyzyoustoredinto"]);

This is the line of code that defines the 'input' field that I am trying to set to the value of a session variable.

<input type="hidden" name="quantity" type="text" class="formbox" id="quanity" size="10"></span></td>

The problem seems to be that I cannot set a value into an object that is "class='formbox'.  If I create a 'textbox' to hold my value then I can set the value to a session variable but I do not know how to define an object that is an 'input' and uses a textbox.  My object has to be an input object or it will not be included in the 'submit'.

 give runat="server" attribute to that hidden control.

now you can access it in code-behind page.

then you can set session by

quanity.Value = Session["yoursessionname"].ToString();

That solved the problem.  Thanks again.