public void MoveDown(OfferDetail detail)
{
var nextPos = this.OfferDetails[detail.Position];
nextPos.Position = detail.Position;
detail.Position += 1;
this.OfferDetails.Sort("Position");
}
public void MoveUp(OfferDetail detail)
{
var prevPos = this.OfferDetails[detail.Position - 2];
prevPos.Position = detail.Position;
detail.Position -= 1;
this.OfferDetails.Sort("Position");
}