The following VB.NET code shows how to perform a file search within a specified folder and all of its sub-folders.

Imports System.IO
Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
 
        Call RecursiveSearch("h:\myfiles")
        MsgBox(stOut)
 
    End Sub
 
    Dim stOut As String
    Sub RecursiveSearch(ByVal stPath As String)
 
        Dim stFolders() As String = Directory.GetDirectories(stPath)
        Dim stFiles() As String = Directory.GetFiles(stPath)
 
        For Each stFile As String In stFiles
            If stFile.Substring(stFile.Length - (stFile.Length - InStrRev(stFile, "\"))) = Me.TextBox1.Text Then
                stOut = stOut & stFile & vbNewLine
            End If
        Next
 
        For Each stFolder As String In stFolders
            Call RecursiveSearch(stFolder)
        Next
 
    End Sub
 
End Class