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C# | Check if Hashtable is read-only

Last Updated : 11 Jul, 2025
Hashtable.IsReadOnly property is used to get a value indicating whether the Hashtable is read-only or not. Syntax: 
public virtual bool IsReadOnly { get; }
Return Value: This property returns true if the Hashtable is read-only otherwise it returns false. The default is false. Below programs illustrate the above-discussed property: Example 1:
Output: 
False
Example 2:
Output: 
False
Note:
  • A collection that is read-only does not allow the addition, removal, or modification of elements after the collection is created.
  • A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection. Therefore, if changes are made to the underlying collection, the read-only collection reflects those changes.
  • Retrieving the value of this property is an O(1) operation.
Reference:
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