Let me give a simple introduction to auto-implemented properties, which is a feature of C#.Net 3.0 and above.

Refer to my article http://www.c-sharpcorner.com/UploadFile/hirenvisavadiya/8528/

You can see the following class:

public class Customer
{
private int _customerID;
private string _companyName;
private Phone _phone;
public int CustomerID
{
get { return _customerID; }
set { _customerID = value; }
}
public string CompanyName
{
get { return _companyName; }
set { _companyName = value; }
}
public Phone Phone
{
get { return _phone; }
set { _phone = value; }
}
}

But in auto-implemented properties we do not need to handle variables like _cutoemrID, _phone etc as in the above snippet.

public class Customer

{
public int CustomerID { get; set; }
public string CompanyName { get; set; }
public Phone Phone{ get; set; }

public string ToString()
{

return "Customer ID: " + CustomerID.ToString() + Environment.NewLine + "Company Name: " + CompanyName + Environment.NewLine + "Phone number: " + Phone.ToString();

}
}

And see the phone class:

public class Phone
{

public string CountryCode { get; set; }

public string AreaCode { get; set; }

public string PhoneNumber { get; set; }

public string ToString()
{
string phonenumber = "Phone number:";
if (!string.IsNullOrEmpty(CountryCode)) phonenumber += CountryCode + "-";
if (!string.IsNullOrEmpty(AreaCode)) phonenumber += AreaCode + "-";
phonenumber += PhoneNumber;
return phonenumber;

}
}

In the above examples, the compiler creates private fields which are accessed through the property's get and set assessors.