'How can i only add to a list if it doesnt exist using lambda expression in c#?

I am using

  myObject.UserObject.Any = (myObject.UserObject.Any ?? Enumerable.Empty<XmlElement>())
 .Concat(new[] { GetNewXmlElement(addressObject.Street, columnsObject.First(t => t.Key 
 == columnsObject.Name).Value, false, columnsObject.Name) }).ToArray();

what this does is just add the value to the end of myObject even if there is one exactly the same in the list , ie it gives duplicates.

How can i only add if there isnt one already in the list by checking Street Value in the Name node of the xml ?

c++sharplambda


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