VisualBasic.Net / Dosya Kopyalama

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 DosyaKopyala("D:\Program", "D:\Yedek")

Üzerine yazarak:

 DosyaKopyala("D:\Program", "D:\Yedek", True)

Sub DosyaKopyala(ByVal SourcePath As String, ByVal DestPath As String, _
                    Optional ByVal Overwrite As Boolean = False)
            Try
                Dim SourceDir As DirectoryInfo = New DirectoryInfo(SourcePath)
                Dim DestDir As DirectoryInfo = New DirectoryInfo(DestPath)

                ' the source directory must exist, otherwise throw an exception
                If SourceDir.Exists Then
                    ' if destination SubDir's parent SubDir does not exist throw an exception
                    If Not DestDir.Parent.Exists Then
                        Throw New DirectoryNotFoundException _
                            ("Hedef dizin bulunamadı: " + DestDir.Parent.FullName)
                    End If

                    If Not DestDir.Exists Then
                        DestDir.Create()
                    End If

                    ' copy all the files of the current directory
                    Dim ChildFile As FileInfo
                    For Each ChildFile In SourceDir.GetFiles()
                        If Overwrite Then
                            ChildFile.CopyTo(Path.Combine(DestDir.FullName, ChildFile.Name), True)
                        Else
                            ' if Overwrite = false, copy the file only if it does not exist
                            ' this is done to avoid an IOException if a file already exists
                            ' this way the other files can be copied anyway...
                            If Not File.Exists(Path.Combine(DestDir.FullName, ChildFile.Name)) Then
                                ChildFile.CopyTo(Path.Combine(DestDir.FullName, ChildFile.Name), _
                                    False)
                            End If
                        End If
                    Next

                    ' copy all the sub-directories by recursively calling this same routine
                    Dim SubDir As DirectoryInfo
                    For Each SubDir In SourceDir.GetDirectories()
                        DosyaKopyala(SubDir.FullName, Path.Combine(DestDir.FullName, _
                             SubDir.Name), Overwrite)
                    Next
                Else
                    Throw New DirectoryNotFoundException("Kaynak dosya bulunamadı: " + _
                        SourceDir.FullName)
                End If
            Catch hata As System.Exception
                MsgBox(hata.Message)
            End Try
        End Sub