How to use C# HashTable Class

Hashtable in C# represents a collection of key/value pairs which maps keys to value. Any non-null object can be used as a key but a value can. We can retrieve items from hashTable to provide the key . Both keys and values are Objects.

The commonly used functions in Hashtable are :

  Add                   : To add a pair of value in HashTable
  ContainsKey    : Check if a specified key exist or not
  ContainsValue  : Check the specified Value exist in HashTable

Remove : Remove the specified Key and corresponding Value

Add : To add a pair of value in HashTable

Syntax : HashTable.Add(Key,Value)
  Key : The Key value
  Value : The value of corresponding key
  Hashtable ht;

ht.Add("1", "Sunday");

Understanding Garbage Collection in the .NET Framework

In this article we will explore the Garbage Collection feature in the .Net framework and the activities required in applications to manage resources complementing the Garbage Collector.

Garbage Collection in Various Environments

One of the new features inherently available in the .Net framework is automatic garbage collection. The term garbage collection can be defined as management of the allocation and release of memory in an application. In C++, developers are responsible for allocating memory for objects created in the application and releasing the memory when the object is no longer needed. COM introduced a new model for memory management - Reference counting. Programmers were only responsible for incrementing the reference count when the object is referenced and decrementing the counter when the object goes out of scope. When the object's reference count reaches zero, the object is deleted and the memory gets freed. Both these schemes are dependent on the developer and result from time to time in memory leaks and application exceptions - conditions that occur at run-time and are not detectable at compilation.