kevinya

 Task.Factory.StartNew(() =>
{
	//任何程式碼在裡面的都是threading執行，但限定framework 4.0以上才有喔
	System.Threading.Thread.Sleep(30000);
	string abc = "1234";
});

或是

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace BackgroundWorkerDemo {
 public partial class Form1: Form {
  private BackgroundWorker bw;
  public Form1() {
   InitializeComponent();
   initProgressBar();
   initBackgroundWorker();
  }
  private void initProgressBar() {
   progressBar1.Step = 1;
  }
  private void initBackgroundWorker() {
    bw = new BackgroundWorker();
    bw.WorkerReportsProgress = true;
    bw.WorkerSupportsCancellation = true;
    bw.DoWork += new DoWorkEventHandler(bw_DoWork);
    bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
    bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
   }
   //背景執行
  private void bw_DoWork(object sender, DoWorkEventArgs e) {
    for (int i = 1;
     (i <= 10); i++) {
     if ((bw.CancellationPending == true)) {
      e.Cancel = true;
      break;
     } else {
      // 使用sleep模擬運算時的停頓
      System.Threading.Thread.Sleep(500);
      bw.ReportProgress((i * 10)); >
     }
    }
   }
   //處理進度
  private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e) {
    progressBar1.Value = e.ProgressPercentage;
    this.lblMsg.Text = e.ProgressPercentage.ToString();
   }
   //執行完成
  private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
   if ((e.Cancelled == true)) {
    this.lblMsg.Text = "取消!";
   } else if (!(e.Error == null)) {
    this.lblMsg.Text = ("Error: " + e.Error.Message);
   } else {
    this.lblMsg.Text = "完成!";
   }
  }
  private void btnStart_Click(object sender, EventArgs e) {
   if (bw.IsBusy != true) {
    this.lblMsg.Text = "開始";
    this.progressBar1.Value = 0;
    bw.RunWorkerAsync();
   }
  }
  private void btnFinish_Click(object sender, EventArgs e) {
   if (bw.WorkerSupportsCancellation == true) {
    bw.CancelAsync();
   }
  }
 }
}

或是

MyClass myClass = new MyClass();
Thread t = new Thread(() => myClass.MyMethod()) { Name = Guid.NewGuid().ToString(), IsBackground = true };
t.Start();

參考資料：
C# 使用 BackgroundWorker 背景執行
http://blog.tonycube.com/2011/04/backgroundworker.html