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Me.GridDataBoundGrid1.BeginUpdate()
Me.GridDataBoundGrid1.DataSource = Nothing
Me.GridDataBoundGrid1.GridBoundColumns.Clear()
Me.GridDataBoundGrid1.Binder.ResetHierarchyLevels()
Dim r As New Random()
Dim dc As DataColumn
For Each dc In dt.Columns
Dim gbc As New GridBoundColumn()
gbc.MappingName = dc.ColumnName
gbc.StyleInfo.BackColor = Color.FromArgb(r.Next(256), r.Next(256), r.Next(256))
Me.GridDataBoundGrid1.GridBoundColumns.Add(gbc)
Next
Me.GridDataBoundGrid1.DataSource = dt
Me.GridDataBoundGrid1.EndUpdate()
Me.GridDataBoundGrid1.Refresh()