how can i run this code in a thread

 private void btnClose_Click(object sender, System.EventArgs e)
	{
		flags -= WinAPI.AW_ACTIVATE;
		flags += WinAPI.AW_HIDE;
		WinAPI.AnimateWindow(this.Handle,animationTime,flags);
		this.Dispose();
	}

 using System;
using System.Runtime.InteropServices;

namespace formAnimation
{
	/// 

	/// Win32 implementation to show / hide a window with animation.
	/// 


	public class WinAPI
	{
		/// 

		/// Animates the window from left to right. This flag can be used with roll or slide animation.
		/// 

		public const int AW_HOR_POSITIVE = 0X1;
		/// 

		/// Animates the window from right to left. This flag can be used with roll or slide animation.
		/// 

		public const int AW_HOR_NEGATIVE = 0X2;
		/// 

		/// Animates the window from top to bottom. This flag can be used with roll or slide animation.
		/// 

		public const int AW_VER_POSITIVE = 0X4;
		/// 

		/// Animates the window from bottom to top. This flag can be used with roll or slide animation.
		/// 

		public const int AW_VER_NEGATIVE = 0X8;
		/// 

		/// Makes the window appear to collapse inward if AW_HIDE is used or expand outward if the AW_HIDE is not used.
		/// 

		public const int AW_CENTER = 0X10;
		/// 

		/// Hides the window. By default, the window is shown.
		/// 

		public const int AW_HIDE = 0X10000;
		/// 

		/// Activates the window.
		/// 

		public const int AW_ACTIVATE = 0X20000;
		/// 

		/// Uses slide animation. By default, roll animation is used.
		/// 

		public const int AW_SLIDE = 0X40000; 
		/// 

		/// Uses a fade effect. This flag can be used only if hwnd is a top-level window.
		/// 

		public const int AW_BLEND = 0X80000;

		/// 

		/// Animates a window.
		/// 

		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static  extern int AnimateWindow (IntPtr hwand , int dwTime , int dwFlags) ;		
	} 
}