how call Method From Dynamically user control With parameter and get value

how call Method From Dynamically user control With parameter and get value

I load user control in my page with following code
UserControl com = (UserControl)LoadControl("~/Sample.ascx");
pnlLoadCom.Controls.Add(com);
I want to call method from all dynamic User controls with parameter and
get param from this method when I click button on my page. How can I do
this?