عمل Progress Bar لاستخدامها في نسخ الملفات

namespace IO
{
	using System;
	using System.Runtime.InteropServices;

	public delegate void CopyProgressCallBack(int Percentage);

	public class File
	{
		enum CopyProgressResult : uint
		{
			Continue	= 0,
			Cancel	  = 1,
			Stop		= 2,
			Quiet	   = 3
		}

		enum CopyProgressCallbackReason : uint
		{
			Chunk_Finished   = 0x00000000,
			Stream_Switch	= 0x00000001
		}

		[Flags]
		enum CopyFileFlags : uint
		{ 
			Fail_If_Exists			   = 0x00000001,
			RestartAble				  = 0x00000002,
			Open_Source_For_Write		= 0x00000004,
			Allow_Decrypted_Destination  = 0x00000008
		}


		[UnmanagedFunctionPointer(CallingConvention.StdCall)]
		private delegate CopyProgressResult CopyProgressRoutine(long totalFileSize,
																long bytesTransfered,
																long streamSize,
																long streamBytesTransfered,
																uint streamNumber,
																CopyProgressCallbackReason callbackReason,
																IntPtr hSourceFile,
																IntPtr hDestinationFile,
																IntPtr lpData);

		[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
		[return: MarshalAs(UnmanagedType.Bool)]
		private static extern bool CopyFileEx(  string lpExistingFileName,
												string lpNewFileName,
												[MarshalAs(UnmanagedType.FunctionPtr)] 
												CopyProgressRoutine lpProgressRoutine,
												IntPtr lpData,
												ref bool pbCancel,
												CopyFileFlags dwCopyFlags);

		public static void Copy(string sourceFile, string destinationFile, CopyProgressCallBack callBack)
		{
			if(System.IO.File.Exists(sourceFile) && (!string.IsNullOrEmpty(destinationFile))) {
				try {
					bool pbCancel = false;
					CopyFileEx(
						sourceFile, destinationFile,
						delegate(long totalFileSize, 
								 long bytesTransfered, 
								 long streamSize, 
								 long streamBytesTransfered, 
								 uint streamNumber, 
								 CopyProgressCallbackReason callbackReason, 
								 IntPtr hSourceFile, 
								 IntPtr hDestinationFile, 
								 IntPtr lpData)
						{
							callBack.Invoke((int)(((double)bytesTransfered / (double)totalFileSize) * 100));
							return CopyProgressResult.Continue;
						},
						IntPtr.Zero, ref pbCancel, CopyFileFlags.RestartAble);
				} catch(Exception e) {
					throw new Exception(e.Message);
				}
			}
		}
	}
}

Call

private void btnStart_Click(object sender, EventArgs e)
{
	File.Copy(txtSrc.Text, txtDest.Text, 
		delegate(int percentage) {
			progressBar1.Value = percentage;
			Text = string.Format("{0}% Transferred.", percentage);
			if(percentage == 100)
				btnStart.Enabled = true;
			else
				btnStart.Enabled = false;
		}
	);
}

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تلميذك Rashadov