protected void ControlsToData()
{
if (_rangingInformation == null)
_rangingInformation = new RangingInformation();
_rangingInformation.FromQuantity = edtLLValue.Quantity;
_rangingInformation.ToQuantity = edtULValue.Quantity;
if (_rangingInformation.FromQuantity.Unit.HasPrefix())
cbLLPrefix.SelectedValue = _rangingInformation.FromQuantity.Unit.Prefix;
else
cbLLPrefix.SelectedIndex = -1;
if (_rangingInformation.FromQuantity.Unit.HasUnit())
cbLLUnit.SelectedValue = _rangingInformation.FromQuantity.Unit.Unit;
else
cbLLUnit.SelectedIndex = -1;
}