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a^=b^=a^=b;

a^=b;
b^=a;
a^=b;

Private Sub Go(myList as list(of String))
     bgw1.RunWorkerAsync(me,myList)
End Sub

Private Sub bgw1_DoWork(sender As Object, e As DoWorkEventArgs) Handles bgw1.DoWork
  'background thread
   Dim myList As List(Of String) = e.Argument
   Dim listCount As Integer = myList.Count
   'long running process
   For i As Integer = 0 To listCount
      Dim resultInteger = DoWork(myList(i))
      bgw1.ReportProgress(resultInteger,myList(i))
   Next
End Sub

Private Sub bgw1_ProgressChanged(sender As Object, e As ProgressChangedEventArgs) Handles bgw1.ProgressChanged
   'main thread
   Dim p As Integer = e.ProgressPercentage
   Dim s As String = CStr(e.UserState)
   Select Case P
     Case 1
       lbl1.Text = s
     Case 2
       lbl2.Text = s
     Case Else
       lbl1.Text = "Invalid Result for " & s
       lbl2.Text = "Invalid Result for " & s
   End Select
End Sub

powershell find recursive

void Main()
{
	Console.WriteLine ("Enter the path you want to search.");
	string searchPath = Console.ReadLine();
	Console.WriteLine(string.Format("Searching : {0}", searchPath));
	DirectoryInfo DirInfo = new DirectoryInfo(searchPath);
	Console.Write("Search Term: ");
	string searchTerm = Console.ReadLine().ToUpper();
	Console.WriteLine(searchTerm);
	Console.WriteLine("Enter the file pattern you want search against.");
	string filePattern = Console.ReadLine();
	try
	{
	var files =  DirInfo.EnumerateFiles(filePattern,SearchOption.AllDirectories);
	foreach (var f in files)
	{
        // Console.WriteLine($"Searching {Path.GetFileName(f.Name)}");  // uncomment to see all file names searched
		string [] allLines = File.ReadAllLines(f.FullName);
		int lineCount = 1;
		bool foundInFile = false;
		foreach (string line in allLines)
		{
			if (line.ToUpper().Contains(searchTerm))
			{
				if (!foundInFile)
				{
					// insures it only prints filename once
					Console.WriteLine("searching {0}", f.FullName.ToUpper());
					foundInFile=true;	
				}
				Console.WriteLine(string.Format("FOUND : {0}  {1}",lineCount, line));
			}
			lineCount++;
		}
		if (foundInFile)
		{
			Console.WriteLine("#############################");
			Console.WriteLine();
		}
	}
	}
	finally
	{
	
	}
}