C# | Insert into OrderedDictionary with key and value at specified index Last Updated : 11 Jul, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report OrderedDictionary.Insert(Int32, Object, Object) method is used to insert a new entry into the OrderedDictionary collection with the specified key and value at the specified index. Syntax: public void Insert (int index, object key, object value); Parameters: index : It is the zero-based index at which the element should be inserted. key : It is the key of the entry to add. value : It is the value of the entry to add. The value can be null. Exceptions: NotSupportedException : If the OrderedDictionary collection is read-only. ArgumentOutOfRangeException : If the index is out of range. Below given are some examples to understand the implementation in a better way: Example 1: CSHARP // C# code to insert entry into // OrderedDictionary with key and // value at the specified index using System; using System.Collections; using System.Collections.Specialized; class GFG { // Driver method public static void Main() { // Creating a orderedDictionary named myDict OrderedDictionary myDict = new OrderedDictionary(); // Adding key and value in myDict myDict.Add("key1", "value1"); myDict.Add("key2", "value2"); myDict.Add("key3", "value3"); myDict.Add("key4", "value4"); myDict.Add("key5", "value5"); // Displaying the number of element initially Console.WriteLine("Number of elements are : " + myDict.Count); // Displaying the elements in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " -- " + de.Value); // Inserting entry into OrderedDictionary // with key and value at the specified index myDict.Insert(2, "Geeks", "Noida"); // Displaying the number of element initially Console.WriteLine("Number of elements are : " + myDict.Count); // Displaying the elements in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " -- " + de.Value); } } Output: Number of elements are : 5 key1 -- value1 key2 -- value2 key3 -- value3 key4 -- value4 key5 -- value5 Number of elements are : 6 key1 -- value1 key2 -- value2 Geeks -- Noida key3 -- value3 key4 -- value4 key5 -- value5 Example 2: CSHARP // C# code to insert entry into // OrderedDictionary with key and // value at the specified index using System; using System.Collections; using System.Collections.Specialized; class GFG { // Driver method public static void Main() { // Creating a orderedDictionary named myDict OrderedDictionary myDict = new OrderedDictionary(); // Adding key and value in myDict myDict.Add("A", "Apple"); myDict.Add("B", "Banana"); myDict.Add("C", "Cat"); myDict.Add("D", "Dog"); // Displaying the number of element initially Console.WriteLine("Number of elements are : " + myDict.Count); // Displaying the elements in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " -- " + de.Value); // Inserting entry into OrderedDictionary // with key and value at the specified index // This should raise "ArgumentOutOfRangeException" // as index is out of range myDict.Insert(10, "E", "Elephant"); // Displaying the number of element initially Console.WriteLine("Number of elements are : " + myDict.Count); // Displaying the elements in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " -- " + de.Value); } } Runtime Error: Unhandled Exception: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: index Note: If the index parameter is equal to the number of entries in the OrderedDictionary collection, the key and value parameters are appended to the end of the collection. Entries that follow the insertion point move down to accommodate the new entry and the indexes of the moved entries are also updated. Reference: https://learn.microsoft.com/en-us/dotnet/api/system.collections.specialized.ordereddictionary.insert?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | Copy OrderedDictionary elements to Array instance at the specified index S Sahil_Bansall Follow Improve Article Tags : C# CSharp-method CSharp-Collections-Namespace CSharp-Specialized-Namespace Similar Reads C# | Insert a new entry in OrderedDictionary with specified key and value OrderedDictionary.Insert(Int32, Object, Object) Method is used to inserts a new entry into the OrderedDictionary collection with the specified key and value at the specified index. Syntax: public void Insert (int index, object key, object value); Parameters: index: It is the zero-based index of type 3 min read C# | Copy OrderedDictionary elements to Array instance at the specified index OrderedDictionary.CopyTo(Array, Int32) method is used to copy the OrderedDictionary elements to a one-dimensional Array object at the specified index. Syntax: public void CopyTo (Array array, int index); Parameters: array: It is the one-dimensional Array which is the destination of the DictionaryEnt 2 min read C# | Add key and value into OrderedDictionary collection OrderedDictionary.Add(Object, Object) method is used to add an entry with the specified key and value into the OrderedDictionary collection with the lowest available index. Syntax: public void Add (object key, object value); Parameters: key : The key of the entry to add. value : The value of the ent 2 min read C# | Remove entry with specified key from OrderedDictionary OrderedDictionary.Remove(Object) method is used to remove entry with the specified key from the OrderedDictionary collection. Syntax: public void Remove (object key); Here, key is the key of the entry to remove. Exceptions: NotSupportedException : If the OrderedDictionary collection is read-only. Ar 3 min read C# | Add the specified key and value into the ListDictionary ListDictionary.Add(Object, Object) method is used to add an entry with the specified key and value into the ListDictionary. Syntax: public void Add (object key, object value); Parameters: key : The key of the entry to add. value : The value of the entry to add. The value can be null. Exceptions: Arg 2 min read C# | Get or set the value associated with specified key in ListDictionary ListDictionary.Item[Object] property is used to get or set the value associated with the specified key. Syntax: public object this[object key] { get; set; } Here, key is the key whose value to get or set. Return Value : The value associated with the specified key. If the specified key is not found, 2 min read Like