var uniquePersons = persons.GroupBy(p => p.Email)

                           .Select(grp => grp.First())

                           .ToArray();

objList.Select(o=>o.typeId).Distinct()

​

if (!IsPostBack) {  

       GridView1.DataSource = GetProducts()

                              .GroupBy(o => new { o.Make, o.Model })

                              .Select(o => o.FirstOrDefault());

       GridView1.DataBind();

}

// Assuming we have a class called 'Person' with a 'Name' property

​

class Person

{

    public string Name { get; set; }

}

​

// Sample data

List<Person> people = new List<Person>()

{

    new Person() { Name = "John" },

    new Person() { Name = "Mary" },

    new Person() { Name = "John" },

    new Person() { Name = "Michael" },

    new Person() { Name = "Mary" }

};

​

// Use LINQ to get distinct names

List<string> distinctNames = people.Select(p => p.Name).Distinct().ToList();

​

// Output

foreach (string name in distinctNames)

{

    Console.WriteLine(name);

}