I have seen in recent past Microsoft has brought back lot of legacy VB stuff into C#. If you remember VB provides with clause , this features bring back memory of that.

  Dim theCustomer As New Customer
        With theCustomer
            .Name = "Coho Vineyard"
            .URL = "http://www.cohovineyard.com/"
            .City = "Redmond"
        End With

Explanation
Lets say we have a Customer class with a property of type CustomerDetails as below

    public class Customer
    {
        public CustomerDetails CustomerDetails { get; set; }
    }

    public class CustomerDetails
    {
        public string CustomerName { get; set; }
    }

Many a times we need to write a code to set CustomerName property as below with proper null checks.

//Prior to C# 6
        private void SetCustomerName(Customer customer)
        {
            if ( customer !=null && customer.CustomerDetails!=null)
                customer.CustomerDetails.CustomerName= "Shakti";
        }
        //With C# 6.0
        private void SetCustomerName6(Customer customer)
        {
               customer?.CustomerDetails?.CustomerName ?? "Shakti";
 }