using System;

using System.Linq;

public class Program

{

    public class Filter 

    {

        public int Var1 { get; set; }

        public int Var2 { get; set; }

        public int Var3 { get; set; }

        public Filter() {

            Var1 = 1;

            Var2 = 2;

            Var3 = 3;

        }

    }

    public static void Main()

    {

        var filter = new Filter();

        var filterType = filter.GetType();

        var readableProperties = filterType.GetProperties().Where( p => p.GetGetMethod() != null );

​

        foreach (var property in readableProperties) 

        {

            var value = (int)property.GetValue( filter );

            Console.WriteLine( "{0} =  {1}", property.Name, value + 3 );

        }

    }

}