Question

I want to add a new property bool IsValid to my class below. I want this property to be NOT Required and set to false by default. I am using this object for wcf purposes, how do I set the default value to false?

[DataContract]
    public class OrderLineItem : IExtensibleDataObject
    {
        ExtensionDataObject IExtensibleDataObject.ExtensionData { get; set; }

        [DataMember]
        public Guid LineItemID { get; set; }

        [DataMember(IsRequired = true, EmitDefaultValue=false)]
        public string ProductID { get; set; }

        [DataMember(IsRequired = true, EmitDefaultValue=false)]
        public decimal Quantity { get; set; }
}

Answer 1

by default it will be false, so nothing else needs to be done.

[DataMember] 
public bool IsValid { get; set; }