C# | SortedDictionary.Add() Method Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report This is used to add a specified key and value to the sorted dictionary. The elements are sorted according to TKey. Syntax: public void Add (TKey key, TValue value); Parameters: key: It is the key of the element to add. value: It is the value of the element to add. The value can be null for reference types. Exceptions: ArgumentNullException : If the key is null. ArgumentException : If an element with the same key already exists in the Dictionary. Below are the programs to illustrate the use of Dictionary<TKey, TValue>.Add() Method: Example 1: csharp // C# code to add the specified key // and value into the SortedDictionary using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Create a new SortedDictionary // of strings, with string keys. SortedDictionary<string, string> myDict = new SortedDictionary<string, string>(); // Adding key/value pairs in myDict myDict.Add("Australia", "Canberra"); myDict.Add("Belgium", "Brussels"); myDict.Add("Netherlands", "Amsterdam"); myDict.Add("China", "Beijing"); myDict.Add("Russia", "Moscow"); myDict.Add("India", "New Delhi"); // To get count of key/value // pairs in myDict Console.WriteLine("Total key/value pairs in" + " myDict are : " + myDict.Count); // Displaying the key/value // pairs in myDict Console.WriteLine("The key/value pairs" + " in myDict are : "); foreach(KeyValuePair<string, string> kvp in myDict) { Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value); } } } Output: Total key/value pairs in myDict are : 6 The key/value pairs in myDict are : Key = Australia, Value = Canberra Key = Belgium, Value = Brussels Key = China, Value = Beijing Key = India, Value = New Delhi Key = Netherlands, Value = Amsterdam Key = Russia, Value = Moscow Example 2: csharp // C# code to add the specified key // and value into the SortedDictionary using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Create a new SortedDictionary // of strings, with string keys. SortedDictionary<string, string> myDict = new SortedDictionary<string, string>(); // Adding key/value pairs in myDict myDict.Add("Australia", "Canberra"); myDict.Add("Belgium", "Brussels"); myDict.Add("Netherlands", "Amsterdam"); myDict.Add("China", "Beijing"); myDict.Add("Russia", "Moscow"); myDict.Add("India", "New Delhi"); // The Add method throws an // exception if the new key is // already in the dictionary. try { myDict.Add("Russia", "Moscow"); } catch (ArgumentException) { Console.WriteLine("An element with Key " + "= \"Russia\" already exists."); } } } Output: An element with Key = "Russia" already exists. Note: A key cannot be null, but a value can be. If the value type TValue is a reference type. This method is an O(log n) operation, where n is Count of elements in the SortedDictionary. Reference: https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.sorteddictionary-2.add?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | SortedDictionary.Remove() Method R rupesh_rao Follow Improve Article Tags : C# CSharp-method CSharp-Generic-Namespace CSharp SortedDictionary Class Similar Reads C# | SortedDictionary.Clear() Method This method is used to remove all key/value pairs from the SortedDictionary<TKey, TValue>. Syntax: public void Clear (); Below are the programs to illustrate the use of the above-discussed method: Example 1: csharp // C# code to remove all pairs // from SortedDictionary using System; using Sys 2 min read C# | SortedDictionary.Clear() Method This method is used to remove all key/value pairs from the SortedDictionary<TKey, TValue>. Syntax: public void Clear (); Below are the programs to illustrate the use of the above-discussed method: Example 1: csharp // C# code to remove all pairs // from SortedDictionary using System; using Sys 2 min read C# | SortedDictionary.Remove() Method This method is used to remove the value with the specified key from the SortedDictionary<TKey, TValue>. Syntax: public bool Remove (TKey key); Return Value: This method returns true if the element is successfully found and removed; otherwise it returns false. This method returns false if key i 2 min read C# | SortedDictionary.Remove() Method This method is used to remove the value with the specified key from the SortedDictionary<TKey, TValue>. Syntax: public bool Remove (TKey key); Return Value: This method returns true if the element is successfully found and removed; otherwise it returns false. This method returns false if key i 2 min read C# | SortedDictionary.ContainsValue() Method This method is used to check whether the SortedDictionary<TKey, TValue> contains an element with the specified value or not. Syntax: public bool ContainsValue (TValue value); Here, the value is the Value to locate in the SortedDictionary. The value can be null for reference types. Return Value 2 min read C# | SortedDictionary.ContainsValue() Method This method is used to check whether the SortedDictionary<TKey, TValue> contains an element with the specified value or not. Syntax: public bool ContainsValue (TValue value); Here, the value is the Value to locate in the SortedDictionary. The value can be null for reference types. Return Value 2 min read Like