how can I create a hierarchical datagridview in vb.net

There's also a control which directly inherits from DataGridView. It's called TreeGridView and is developed by Mark Rideout:

http://blogs.msdn.com/b/markrideout/archive/2006/01/08/customizing-the-datagridview-to-support-expanding-collapsing-ala-treegridview.aspx[^]

Check also the comments on Mark's blog, they contains a few bugfixes and also lots of improvements.

i think u can not do this with fridview !!!!!!

I have some trick.


Public Class Form1

Dim UpperHeight As Integer
Dim FullHeight As Integer
Dim RowIdx As Integer

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Me.departmentTableAdapter.Fill(Me.BCMDBDataSet.department)
UpperHeight = Panel1.Height + 3 + DGV1.ColumnHeadersHeight


End Sub

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Me.Dispose()
End Sub


Private Sub DGV1_RowHeaderMouseDoubleClick(sender As Object, e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DGV1.RowHeaderMouseDoubleClick
dim i as integer=DGV1.CurrentRow.Cells(0).Value 'dept Number
Me.employeesTableAdapter.FillBydepartment번호(Me.BCMDBDataSet.employees, i)
RowIdx = DGV1.RowTemplate.Height * (DGV1.CurrentRow.Index + 1)
FullHeight = Panel1.Height + DGV1.Height
DGV2.BringToFront()
DGV2.Location = New Point(20, UpperHeight + RowIdx)
DGV2.Size = New Size(DGV1.Width, FullHeight)
End Sub

Private Sub DGV1_SizeChanged(sender As Object, e As System.EventArgs) Handles DGV1.SizeChanged
DGV2.Size = New Size(DGV1.Width, FullHeight)
End Sub

Private Sub DGV2_RowHeaderMouseDoubleClick(sender As Object, e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DGV2.RowHeaderMouseDoubleClick
DGV2.SendToBack()
End Sub
End Class