WinForm accessing controls across threads

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Windows.Forms;namespacewindowsformsapplication1{ Public Partial classForm1:form {Delegate voidDelshow (stringstrinput); Delshow Delshow=NULL;  PublicForm1 () {InitializeComponent (); Delshow=Newdelshow (myshow); //control.checkforillegalcrossthreadcalls = false;        }        Private voidbtnTest_Click (Objectsender, EventArgs e) {System.Threading.Thread T1=NewSystem.Threading.Thread (() = {                if( This. invokerequired) {#regionWay One//This . Invoke (new action<string> (s = = {This.label1.Text = s;}), "BBB");                    #endregion                    #regionWay Two This. Invoke (Delshow,"CCC"); #endregion                }                Else                {                     This. Label1. Text ="AAA";            }                            }); T1. IsBackground=true; T1.        Start (); }        Private voidMyshow (stringstrinput) {             This. Label1. Text =strinput; }    }}

WinForm accessing controls across threads