Bind asp.net control's value to code behind function

I have a hidden field that i want to bind to either a function on the page's code behind. I don't quite recall the exact syntax and i can't find the answer via Google. Is the code below correct? Thank.

print("<asp:HiddenField ID="dummy" Value='<%#Getdummy() %>' runat="server" />");

From stackoverflow

• If you have the hidden field with runat=server, you could write code to assign value in the code behind (rather than in the markup).

• The code you've put looks pretty good ...

  The two step process is ... add the hidden field to the markup

  <asp:HiddenField ID="hdnId" runat="server" Value='<%# GetValue() %>'/>
  

  Then create the specified method signature ...

  protected string GetValue()
  {
     return "something";
  }
  

  Hope this helps ...