C# | Insert a new entry in OrderedDictionary with specified key and value Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report 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 System.Int32 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: ArgumentOutOfRangeException: If the index is out of range. NotSupportedException: If the collection is read-only. Below programs illustrate the use of above-discussed method: Example 1: CSharp // C# code to add a new entry into the // OrderedDictionary collection with // the specified 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"); Console.WriteLine("Before Updation: "); // Displaying the key/value pairs in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " --> " + de.Value); // using Insert(Int32, Object, Object) Method // to add a new entry at index 5 myDict.Insert(5, "key6", "value6"); Console.WriteLine("\nAfter Updation: "); // Displaying the key/value pairs in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " --> " + de.Value); } } Output: Before Updation: key1 --> value1 key2 --> value2 key3 --> value3 key4 --> value4 key5 --> value5 After Updation: key1 --> value1 key2 --> value2 key3 --> value3 key4 --> value4 key5 --> value5 key6 --> value6 Example 2: CSharp // C# code to add a new entry into the // OrderedDictionary collection with // the specified 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("1", "C"); myDict.Add("2", "C++"); myDict.Add("3", "Java"); myDict.Add("4", "Python"); myDict.Add("5", "C#"); Console.WriteLine("Before Updation: "); // Displaying the key/value pairs in myDict foreach(DictionaryEntry de in myDict) Console.WriteLine(de.Key + " --> " + de.Value); // using Insert(Int32, Object, Object) Method // this will give error as index is out of range // here indexing is zero-based myDict.Insert(6, "6", "HTML"); Console.WriteLine("\nAfter Updation: "); // Displaying the key/value pairs 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: The key and value parameters will be appended to the end of the collection if the index parameter is equal to the number of entries in the OrderedDictionary 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# | Add key and value into OrderedDictionary collection K Kirti_Mangal Follow Improve Article Tags : C# CSharp-method CSharp-Specialized-Namespace CSharp-Specialized-OrderedDictionary Similar Reads C# | Insert into OrderedDictionary with key and value at specified index 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. 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