Property Setter Block not excuting as desired in WCF

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WCF

Hi,
In our WCF service class we have a property in whose setter block we are setting another property. Please see
the below snippet:

public bool isDirty;
public string title;
       [XmlIgnore]
        public bool IsDirty
        {
            get
            {
                return isDirty;
            }
            set
            {
                isDirty = value;
            }
        }
public string Title
        {
            get { return title; }
            set
            {
                if (value != title)
                {
                    IsDirty = true;
                    title = value;
                }
            }
        }

This is working properly when we have tested it through direct Dll reference. But, when are testing it through service reference object the setter block is not working as expected. I.e. the IsDirty flag is not becoming true.

Please advise.

[edit]Inline code converted to code block - OriginalGriff[/edit]