4)Design an application in VB which has a Drivelistbox, Dirlistbox, Filelistbox control. The form contains the following command buttons: All drives: Display all drives in computer (including network drives) All subdirectories: Display all subfolders of the currently selected directory.
All files : Display a popup menu which contains the following options:
All document files
b All bitmaps
c All files
On selection of option, display the specified type.

Private Sub cmdAddDrives_Click()
lstResult.AddItem Drive1.List(I)
Next
End Sub

Private Sub cmdAllFiles_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 1 Then
PopupMenu mnuFiles
End If
End Sub

Private Sub cmdAllSubDirectories_Click()
lstResult.Clear
For I = 0 To Dir1.ListCount – 1
lstResult.AddItem Dir1.List(I)
Next
End Sub
Private Sub cmdClear_Click()
lstResult.Clear
End Sub
Private Sub Dir1_Change()
File1.Path = Dir1.Path
End Sub
Private Sub Drive1_Change()
Dir1.Path = Drive1.Drive
End Sub Private Sub mnuAllFiles_Click()
File1.Pattern = “*.*”
For I = 0 To File1.ListCount – 1
lstResult.AddItem File1.List(I)
Next
End Sub
Private Sub mnuBitmaps_Click()
File1.Pattern = “*.bmp”
For I = 0 To File1.ListCount – 1
lstResult.AddItem File1.List(I)
Next
End Sub

Private Sub mnuText_Click()
File1.Pattern = “*.txt”
For I = 0 To File1.ListCount – 1
lstResult.AddItem File1.List(I)
Next
End Sub

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