How to call an ASP.NET Subroutine from a javascript function

[cesark]

I want to call a subroutine from a javascript function. How can I do it? I am trying to do it thus: (But it doesn’ t work)

Client side code (javascript)

function check_State(eventTarget, eventArgument) {  

      if (document.form_newOffer.states.value != "0") {
              var theform;

            theform = document.form_newOffer;

        }

        theform.submit();

      }

}

The form control that triggers the js function:

<asp:dropdownlist ID="product" onChange="check_State(' Certificates ','')" runat="server" CssClass="letter1"></asp:dropdownlist>

And a piece of the Subroutine:

Sub Certificates(sender As Object, E As EventArgs)
  If states.SelectedItem.Value <> "0" Then 

     Dim CmdCert AS New SqlCommand("sel_CertAuto", strConnection)
     CmdCert.CommandType = CommandType.StoredProcedure

...

Thank you,
Cesar