List out all controls in a form

Question

Hi all I am trying for a solution where I need to traverse through each and every from in my application and need to list out the controls which is not having associate control id for this I tried the following way first 

 Page p = BuildManager.CreateInstanceFromVirtualPath("/" + "test.aspx", typeof(Page)) as Page;

((IHttpHandler)p).ProcessRequest(HttpContext.Current);

                        ControlCollection lCollection = p.Controls;

Which is working a expected but the page which I am calling in that virtual path is getting added to the current page, how can I stop adding this.

The other one I tried is 

string filePath = System.Web.HttpContext.Current.Request.PhysicalApplicationPath;

                filePath = filePath + "test.aspx";

 using (StreamReader sr = new StreamReader(filePath))

                {

                    MessageBody = sr.ReadToEnd();

                }

From the MessageBody I need to list out all the controls using some Regex, is this possible can some one help me to achieve my task