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<Incentive IncentiveName="Test30">
        <Conditions>
          <ProductCondition
            Product="123,124,125"
            ProductRatio="1;1;1"/>
        </Conditions>
        <Rewards>
          <ProductReward
            Product="126"
        </Rewards>
      </Incentive>					

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string reward1 = "Test30";

            var i1 = new IncentivesIncentive();
            i1.IncentiveName = reward1;
            i1.Rewards = new IncentivesIncentiveRewards();
            i1.Rewards.ProductReward = new IncentivesIncentiveRewardsProductReward();
            i1.Rewards.ProductReward.Product = "138";					

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            System.Xml.Serialization.XmlSerializer s = new System.Xml.Serialization.XmlSerializer(typeof(object));
            FileInfo b = new FileInfo("blub");

            // dserialisieren
            MyObject obj = null;
            using(Stream stream = b.OpenRead())
            {
                obj = (MyObject) s.Deserialize(stream);
            }

            // object verändern
            obj.Value = 5;

            // serialisieren
            using (Stream stream = b.OpenWrite())
            {
                s.Serialize(stream, obj);
            }