Determines whether the Hashtable contains a specific key.
Assembly: mscorlib (in mscorlib.dll)
Return ValueType: System.Boolean
true if the Hashtable contains an element with the specified key; otherwise, false.
This method is an O(1) operation.
Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.