ATMLCommonLibrary.controls.StandardUnitControl.SetLimitCombos C# (CSharp) Method

        private void SetLimitCombos()
        {
            if (!String.IsNullOrEmpty(edtStnUnit.Text))
            {
                String stdUnit = edtStnUnit.Text;
                String prefix = "";
                //-----------------------------------------------------------------------------------------//
                //--- Lookup standard unit - if not found strip off 1st letter for prefix and try again ---//
                //-----------------------------------------------------------------------------------------//
                cmbStdUnit.SelectedValue = stdUnit;
                if (cmbStdUnit.SelectedValue == null)
                {
                    prefix = stdUnit.Substring(0, 1);
                    stdUnit = stdUnit.Substring(1);
                    cmbStdUnit.SelectedValue = stdUnit;
                    cmbPrefix.SelectedValue = prefix;
                }
                else //--- If the standard unit is found then clear out the prefix ---//
                {
                    cmbPrefix.SelectedIndex = -1;
                }
            }
        }