This is a simple demo of Vb.net Treeview control. What this does is uses the the Treeview and list all active drives on the computer. This then adds a node for file system, drive type,drive size, drive free, drive used. It also adds two tooltips that list the percent free and percent

used.

Public Class Form1
	Const GB = 1073741824
	Const MB = 1048576
	Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
		Dim ND As TreeNode
		ND = TreeView1.Nodes.Add(String.Format(My.Computer.Name))
		DiskInfo()
	End Sub
	Private Sub DiskInfo()
		For Each Drv In My.Computer.FileSystem.Drives
			If Drv.IsReady Then
				' Disk Size
				Dim St = "", S1 = ""
				If Drv.TotalSize < GB Then
					St = " MB"
					S1 = FormatNumber(Drv.TotalSize / MB, 2)
				Else
					St = " GB"
					S1 = FormatNumber(Drv.TotalSize / GB, 2)
				End If
				If Len(S1) = 4 Then S1 = "00" & S1
				If Len(S1) = 5 Then S1 = "0" & S1
				' Disk Free
				Dim F1 = Drv.TotalFreeSpace, F2 = "", F3 = "", Ft = ""
				If F1 < GB Then
					Ft = " MB"
					F2 = FormatNumber(F1 / MB, 2)
				Else
					Ft = " GB"
					F2 = FormatNumber(F1 / GB, 2)
				End If
				If Len(F2) = 4 Then F2 = "00" & F2
				If Len(F2) = 5 Then F2 = "0" & F2
				F3 = "Percent Free : " & FormatPercent(F1 / Drv.TotalSize, 2)
				' Disk Used
				Dim U1 = Drv.TotalSize - Drv.TotalFreeSpace, U2 = "", U3 = "", Ut = ""
				If U1 < GB Then
					Ut = " MB"
					U2 = FormatNumber(U1 / MB, 2)
				Else
					Ut = " GB"
					U2 = FormatNumber(U1 / GB, 2)
				End If
				If Len(U2) = 4 Then U2 = "00" & U2
				If Len(U2) = 5 Then U2 = "0" & U2
				U3 = "Percent Used : " & FormatPercent(U1 / Drv.TotalSize, 2)
				Dim node As TreeNode
				node = TreeView1.Nodes.Add(String.Format(Drv.Name & Drv.VolumeLabel))
				node.Nodes.Add(String.Format("File " & Drv.DriveFormat))
				Dim Dtype = ""
				Select Case Drv.DriveType
					Case IO.DriveType.Unknown : Dtype = "Unknown Drive Type"
					Case IO.DriveType.NoRootDirectory : Dtype = "No Root Directory Drive"
					Case IO.DriveType.Removable : Dtype = "Removable Drive"
					Case IO.DriveType.Fixed : Dtype = "Hard Drive"
					Case IO.DriveType.Network : Dtype = "Network Drive"
					Case IO.DriveType.CDRom : Dtype = "Optical Drive"
					Case IO.DriveType.Ram : Dtype = "Ram Drive"
				End Select
				Dim N As TreeNode
				N = node.Nodes.Add(String.Format("Type " & Dtype))
				N.ForeColor = Color.FromArgb(1, 32, 96, 147)
				Dim N1 As TreeNode
				N1 = node.Nodes.Add(String.Format("Size " & S1 & St))
				N1.ForeColor = Color.FromArgb(1, 32, 179, 131)
				Dim N2 As TreeNode
				N2 = node.Nodes.Add(String.Format("Free " & F2 & Ft))
				N2.ForeColor = Color.FromArgb(1, 32, 131, 179)
				N2.ToolTipText = F3
				Dim N3 As TreeNode
				N3 = node.Nodes.Add(String.Format("Used " & U2 & Ut))
				N3.ForeColor = Color.FromArgb(1, 227, 121, 68)
				N3.ToolTipText = U3
			End If
		Next
	End Sub
End Class

Source Code

Good example