C# Eliminating Duplicates in LIST Collection

I have a LIST Collection with 6 columns and I want to remove duplicates based on the column names attributeTtitle.  How can I remove or prevent duplicates based on the attributeTtitle column?  

Logic below writes all attributeTtitles from this collection to EXCEL but there are some duplicates attributeTtitles that need to be removed or ignored.
                foreach (var item in EXCELColummns)
                    Excel.Columns.Add(String.Format("{0}", item.attributeTtitle), Type.GetType("System.String"));
                    //Excel.Columns.Add(String.Format("{0}", item.id), Type.GetType("System.String"));

List<FilteredValuesOfAttribure> EXCELColummns = new List<FilteredValuesOfAttribure>();
 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; }
        public string SortGroup { get; set; }
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Fernando SotoRetiredCommented:
Hi tmajor99;

The following linq query will remove duplicate FilteredValuesOfAttribure object from the List of EXCELColummns.

EXCELColummns = (from fv in EXCELColummns
                 group fv by fv.attributeTtitle into attribGroup
                 select attribGroup.First( )).ToList();

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Another approach is this:
You can make the FilteredValuesOfAttribure class implement IEquatable (Link)
you can create another class which implements the IEqualityComparer (Link)

In both cases, you can then use the Distinct() method on the List.
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