Dim sql4 As String = "select * from tTacGia"
        dtcbo = New DataTable("tTacGia")
        dacbo = New SqlDataAdapter(sql4, con)
        dacbo.Fill(dtcbo)
        cbomatacgia.DataSource = dtcbo
        cbomatacgia.DisplayMember = "TenTG"
        cbomatacgia.ValueMember = "MaTG"
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