Add key-value pair in C# Dictionary

To add key-value pair in C# Dictionary, firstly declare a Dictionary.

IDictionary<int, string> d = new Dictionary<int, string>();

Now, add elements with KeyValuePair.

d.Add(new KeyValuePair<int, string>(1, "TVs"));
d.Add(new KeyValuePair<int, string>(2, "Appliances"));
d.Add(new KeyValuePair<int, string>(3, "Mobile"));

After adding elements, let us display the key-value pair.

Example

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main() {
      IDictionary<int, string> d = new Dictionary<int, string>();
      d.Add(new KeyValuePair<int, string>(1, "TVs"));
      d.Add(new KeyValuePair<int, string>(2, "Appliances"));
      d.Add(new KeyValuePair<int, string>(3, "Mobile"));
      d.Add(new KeyValuePair<int, string>(4, "Tablet"));
      d.Add(new KeyValuePair<int, string>(5, "Laptop"));
      d.Add(new KeyValuePair<int, string>(6, "Desktop"));
      d.Add(new KeyValuePair<int, string>(7, "Hard Drive"));
      d.Add(new KeyValuePair<int, string>(8, "Flash Drive"));
      foreach (KeyValuePair<int, string> ele in d) {
         Console.WriteLine("Key = {0}, Value = {1}", ele.Key, ele.Value);
      }
   }
}

Output

Key = 1, Value = TVs
Key = 2, Value = Appliances
Key = 3, Value = Mobile
Key = 4, Value = Tablet
Key = 5, Value = Laptop
Key = 6, Value = Desktop
Key = 7, Value = Hard Drive
Key = 8, Value = Flash Drive