Format a double string datetime

String.Format( "{0:#.##}",dt.Rows(0).Item("CostPerUnit"))
DateTime.Parse(.Item("ExpiryDt").ToString).ToString("dd/MM/yyyy")
Convert.ToDateTime(cpRow["AvailabilityDate"]).ToString("MM-dd-yyyy")

txtQuantity.Text = value.ToString("f2") eg: 10.32