C# Creating a unique list of rows from a LIST Array

I have an Array called nodeValues which contains a nested set of attributes for each product.  I need some help to identify only the unique set of attributes from this array.  This array contains a nested table for every product like this:

This table look like this:
    [0] nodeurl = Product 123
                       [0] Attributetitle = Price
                       [1] Attributetitle = Description
                      [2] Attributetitle = Weight
    [1] nodeurl = Product 888
                       [0] Attributetitle = Price
                       [1] Attributetitle = Description
                      [2] Attributetitle = Weight
   [2] nodeurl = Product 999

All I want to is create a unique set of attributes from the nodeurl array.   For example;

                       [0] Attributetitle = Price
                       [1] Attributetitle = Description
                       [2] Attributetitle = Weight

Here is how I started to code for this:

 foreach (var items in nodeValues)
                      var Filtervalue = items.value.Select(item => item).Distinct().ToArray();
                      foreach (var attributes in Filtervalue)
                          FilteredAttributes.Add(....)   ---> How can I not add a duplicate attribute row?   Is there a way to prevent from adding the same attribute to this list array or perhaps a better way I get just get the unique attributes from this array without a forloop?

Below is the nodevalue class:

public partial class nodeValue : object, System.ComponentModel.INotifyPropertyChanged {
        private string nodeURLField;
        private value[] valueField;

Below are the list arrays.

List<FilteredValuesOfAttribure> FilteredValueOfProduct = new List<FilteredValuesOfAttribure>();
List<FilteredValuesOfAttribure> FilteredAttributes = new List<FilteredValuesOfAttribure>();

Below is the class:

public class FilteredValuesOfAttribure
        public string attributeURL { get; set; }
        public string attributeTtitle { get; set; }
        public string value1 { get; set; }
        public string id { get; set; }
        public string name { get; set; }
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AndyAinscowFreelance programmer / ConsultantCommented:

Unique for me means one of.  Do you mean if the Attributetitle 'price' appears for two products then it is NOT to appear in the list of unique values?  Because according to your example this list of unique values is empty, everything is duplicated in the two products (123 and 888).
Bob LearnedCommented:
It sounds like you need the LINQ DistinctBy operator:

LINQ DistinctBy - With Lambda Expression Parameter

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