C# - Rendering ASPX Page Without A Request?

I have an ASPX page that I intend to use as a template to generate some HTML. I have defined my markup and data bound controls and built a function to do all the data binding, call this.Render and return the HTML. The function works just fine when called from Page_Load.

My intent was to bypass page request and directly call the method and get the page HTML, but when I call the function without making a HTTP Request, none of my server side controls are initialized.

Is there any way I can call a method on a page, pass some params and get the HTML output without making a HTTP Request. I believe Server.Execute could do it but i cant find a way to pass params in it.

I am calling the function like this

MyPage ThreadHTMLGenerator = new MyPage;
string threadHTML= ThreadHTMLGenerator.GenerateExpandedHTML(param1, param2, param3);