Public Class Form1
 
    Dim dt1,dt2 As DataTable
    Dim dv1,dv2 As DataView
 
    'how to reproduce the behaviour
    '0.1. enter data ONLY in the lower gridview's 1st column
    '0.2. during steps 1-3, use only arrow keys to move inside the lower 
    ' gridview
    '0.3. during steps 1-3, always leave the focus on the lower gridview
    '1. enter 7 in column 0 row 2 (0-indexind, this is the third row)
    ' -> order in upper gridview changes correctly
    '2. enter 6 in column 0 row 1
    ' -> order in upper gridview changes correctly
    '3. enter 5 in column 0 row 0
    ' -> ERROR 1: order in upper gridview does not change
    '3.1. to overcome error 1, click into the upper gridview -> the gridview 
    ' will be ordered
    '4. click into the lower gridview again, into column 0 row 1 (DO NOT click 
    ' into any other cell inbetween), and enter 8
    ' -> ERROR 2: order in upper gridview does not change, and even won't if _
      you click into the upper gridview
    '    -> this error does sometimes not occur if you click into any other 
    ' cell inbetween (hence the hint at the beginning)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        dt1 = New DataTable
        dt2 = New DataTable
        dt1.Columns.Add()
        dt1.Columns.Add()
        dt2.Columns.Add()
        dt2.Columns.Add()
        dt1.Columns(0).DataType = GetType(System.Double)
        dt1.Columns(1).DataType = GetType(System.Double)
        dt2.Columns(0).DataType = GetType(System.Double)
        dt2.Columns(1).DataType = GetType(System.Double)
        dt1.Rows.Add()
        dt1.Rows.Add()
        dt1.Rows.Add()
        dt2.Rows.Add()
        dt1.Rows.Add()
        dt2.Rows.Add()
        dt2.Rows.Add()
        dt2.Rows.Add()
        dt1.Rows(0).Item(0) = 1
        dt1.Rows(0).Item(1) = 1
        dt1.Rows(1).Item(0) = 2
        dt1.Rows(1).Item(1) = 2
        dt1.Rows(2).Item(0) = 3
        dt1.Rows(2).Item(1) = 3
        dt1.Rows(3).Item(0) = 4
        dt1.Rows(3).Item(1) = 4
        dt2.Rows(0).Item(0) = 1
        dt2.Rows(0).Item(1) = 1
        dt2.Rows(1).Item(0) = 2
        dt2.Rows(1).Item(1) = 2
        dt2.Rows(2).Item(0) = 3
        dt2.Rows(2).Item(1) = 3
        dt2.Rows(3).Item(0) = 4
        dt2.Rows(3).Item(1) = 4
        dv1 = New DataView(dt1)
        dv2 = New DataView(dt2)
        dv1.Sort = dt1.Columns(0).Caption
        dv2.Sort = dt2.Columns(0).Caption
        DataGridView1.DataSource = dv1
        DataGridView2.DataSource = dv2
    End Sub
 
    Private Sub DataGridView1_CellEndEdit(ByVal sender As Object, ByVal e As _
      System.Windows.Forms.DataGridViewCellEventArgs) Handles _
      DataGridView1.CellEndEdit
        'write BIG values in all fields of the sorted row, bottom to top so 
        ' that the row order is not changed during this in the upper gridview
        For i As Integer = 3 To 0 Step -1
            DataGridView2.Item(0, i).Value = 1000000000 + i
        Next
        'copy the entries from the lower gridview into the upper one
        For i As Integer = 0 To 3
            DataGridView2.Item(0, i).Value = DataGridView1.Item(0, i).Value
        Next
    End Sub
 
End Class