using System; 

using System.Collections.Generic; 

public class Program

{

    public static void Main()

    {

        // Creating a dictionary 

        // using Dictionary<TKey,TValue> class 

        Dictionary<int, string> My_dict =   

            new Dictionary<int, string>();  

​

        // Adding key/value pairs in the  

        // Dictionary Using Add() method 

        My_dict.Add(1123, "Welcome"); 

        My_dict.Add(1124, "to"); 

        My_dict.Add(1125, "GeeksforGeeks"); 

        // Using ContainsValue() method to check 

        // the specified value is present or not 

        if (My_dict.ContainsValue("GeeksforGeeks")==true) 

        { 

            Console.WriteLine("Value is found...!!"); 

        } 

​

        else

        { 

            Console.WriteLine("Value is not found...!!"); 

        }

​

        if (My_dict.ContainsKey(1125))

        {

            Console.WriteLine(My_dict[1125]);

        }

        else

        { 

            Console.WriteLine("Value is not found...!!"); 

        }

​

        // Before Remove() method 

        foreach(KeyValuePair<int, string> ele in My_dict) 

        { 

            Console.WriteLine("{0} and {1}",  

                              ele.Key, ele.Value); 

        } 

        Console.WriteLine(); 

​

        // Using Remove() method  

        My_dict.Remove(1123); 

​

        // After Remove() method 

        foreach(KeyValuePair<int, string> ele in My_dict) 

        { 

            Console.WriteLine("{0} and {1}", 

                              ele.Key, ele.Value); 

        } 

        Console.WriteLine(); 

​

​

        // Using Clear() method 

        My_dict.Clear(); 

​

        Console.WriteLine("Total number of key/value "+ 

           "pairs present in My_dict:{0}", My_dict.Count); 

    }

}