ApplyFilter example

 DoCmd.ApplyFilter, "FieldName"

 DoCmd.ApplyFilter , "SessionNumber Like '*" & hlpdskSessNo & "*'"
 

or

 DoCmd.ApplyFilter , "SessionNumber" & hlpdskSessNo

or

MalzemeNo is a text box where filter be applied on , text20 is a combo box where I make the selection:

Forms![frmMalzemeTakip].Form.Filter = " MalzemeNo = " & Me.Text20.Column(0)

Forms![frmMalzemeTakip].Form.FilterOn = True