LINQ (Single, SingleOrDefault)

public class Person
{
	public string Name{get;set;}
	public string Surname{get;set;}
	public int Age{get;set;}
}
 
public class Example
{
	List<Person> people = new List<Person>();
	
	public Example()
	{
		people.Add(new Person()
		{
			Name = "Joe",
			Surname = "Smith",
			Age = 35
		});
		people.Add(new Person()
		{
			Name = "John",
			Surname = "Doe",
			Age = 24
		});	
		people.Add(new Person()
		{
			Name = "Jane",
			Surname = "Doe",
			Age = 48
		});
	}
	
	public Person GetSinglePersonFromList(string name)
	{
                // The single element of the input sequence.
		Person person1 = (from p in people
					where p.Name = name
					select p).Single();
 
                // The single element of the input sequence, or default(TSource) if the sequence contains no elements.
		Person person2 = (from p in people
					where p.Name = name
					select p).SingleOrDefault();
 
                return person1;
	}
}