Method C # child thread executed, calling the main thread

private delegate void CheckVersionNumber_CallBack (string str) ; // defined as a delegate for detecting a version 

// version detects 
Private  void m_CheckVersionNumber ( String strVersionNumber) 
{ 
            the try 
            { 
                CheckVersionNumber_CallBack the CallBack = new new CheckVersionNumber_CallBack (Thread_CheckVersionNumber_CallBack); // the method of assigning delegate 
                Thread = TH new new the thread (m_Thread_CheckVersionNumber); 
                th.IsBackground = to true ; 
                th.Start (the CallBack); // be transmitted to the child thread delegate 
            }
             the catch(Exception EX) 
            { 
                MessageBox.Show ( " Error detection m_CheckVersionNumber version! " + StrVersionNumber + "   " + ex.Message.ToString ()); 
            } 

}

 //子线程执行
 private void m_Thread_CheckVersionNumber(object obj)
 {
            string strVersionNumber = this.Text;

            clsWebSubmit objPost = new clsWebSubmit();
            string strUrl = clsConfig.CheckVersionNumberUrl;
            string strParam = "version_number=" + strVersionNumber;
            string strResult = objPost.m_PostSubmit(strUrl, strParam);

            Newtonsoft.Json.Linq.JObject jsonStr = Newtonsoft.Json.Linq.JObject.Parse(strResult);
            string str = jsonStr["result"].ToString().Trim();// 

            CheckVersionNumber_CallBack CallBack = obj as CheckVersionNumber_CallBack;//强转为委托
            CallBack(str);
 }

 // main thread method 
 Private  void Thread_CheckVersionNumber_CallBack ( String STR) 
 { 
            IF ( the this .lstHttpEvent.InvokeRequired == to true ) 
            { 
                ReceiveMsgModel Msg = new new ReceiveMsgModel (Thread_CheckVersionNumber_CallBack); // Invokes the method name of 
                the this .Invoke (Msg, new new  Object [ ] STR {}); // not form the thread back to the form thread 
            }
             the else 
            { 
                IF (STR == " to false " ) //Not up to date, true to the latest 
                { 
                    MessageBox.Show ( " has a new version is released, please download the update in a timely manner! " );
                     The this .lstHttpEvent.SelectTab ( " tabVersion " ); 
                } 
            } 
}