how to get unique list in c#

using(var dataModel = new DataModel())
{
  var classes = dataModel.Attributes.Where(a => a.Field == "Class").Select(a => a.Key).Distinct().ToList();
}

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Satoh 130 points

                                    if (!IsPostBack) {  
       GridView1.DataSource = GetProducts()
                              .GroupBy(o =&gt; new { o.Make, o.Model })
                              .Select(o =&gt; o.FirstOrDefault());
       GridView1.DataBind();
}

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