using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Data.Linq;

public class Program

{

    public static void Main()

    {

              Dictionary<string, object> dict = new Dictionary<string, object>();

dict.Add("obj 1", null);

dict.Add("obj 2", new object());

dict.Add("obj 3", new object());

dict.Add("obj 4", null);

​

Dictionary<string, object> dict2 = new Dictionary<string, object>();

dict2.Add("obj 1", null);

dict2.Add("obj 2", new object());

dict2.Add("obj 3", null);

dict2.Add("obj 4", null);

​

Dictionary<string, object> dict3 = new Dictionary<string, object>();

dict3.Add("obj 1", null);

dict3.Add("obj 2", null);

dict3.Add("obj 3", new object());

dict3.Add("obj 4", null);

​

List<Dictionary<string, object>> listDict = new List<Dictionary<string, object>> {dict, dict2, dict3};

​

var Result = listDict.Select(x => x.Where(y=>y.Value != null));

​

        foreach(var item in Result)

        {

            foreach(var pair in item)

            {

                Console.WriteLine("Key : "+pair.Key+" Value: "+pair.Value);

            }

        }

    }

}

​

​