get distinct values from a variable in c# code example

Example 1: c# linq select only unique values from list

var uniq = allvalues.GroupBy(x => x.Id).Select(y=>y.First()).Distinct();

Example 2: c# linq select only unique values from list

var uniqueCategories =  repository.GetAllProducts()
                                  .Select(p=>p.Category)
                                  .Distinct();

Example 3: c# get distinct values all fields from list

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