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Refer this article for Column Locking / Freezing in Infragistics Ultra WebGrid

If you need to change background color for a  frozen columns then ..
backcolor property must be changed first then cells have to be locked.

[sourcecode language='vb']
  e.Layout.Bands(0).Columns(0).CellStyle.BackColor = Drawing.Color.Beige
  e.Layout.Bands(0).Columns(0).Header.Fixed = True[/sourcecode] and in InitializeLayout of ultraWebgrid [sourcecode language='vb']Private Sub ultrawebgrid_InitializeLayout(ByVal sender As Object, ByVal e As Infragistics.WebUI.UltraWebGrid.LayoutEventArgs) Handles uwgCategory.InitializeLayout

e.Layout.UseFixedHeaders = True

End Sub [/sourcecode]