Button myButton = (Button)this.FindControl("Button1"); if (myButton != null) { // Do something with the button }In this example, we use the FindControl method to search for a button control with an ID of "Button1" on the current page. If the control is found, we can use it to perform some action. The System FindControl method is part of the System.Web.UI.WebControls namespace, which is included in the System.Web.dll library.