Hash Table In C#

What is a hash table ? When do we use it and what is the syntax?

In C#, hash table is nothing but a collection of key or values, which maps a key to the value. Any non-null object can be used as a key. We can retrieve the items from hash table to provide the key.

Let see what are the common functions used in hash table, listed below.

• Add- To add a pair of value in Hashtable
• Containskey- It checks if a specified key exists or not.
• ContainsValue- It checks if a specified value exists or not.
• Remove- Deletes the specified key and value.

Now, let’s see how to use each function in the hash table in detail.

1. Add
   This function is used to add a pair of values in the hash table.
   
   Syntax
   

   HashTable. Add(Key,Value)
   Hashtable ht;
   ht.Add("1","Sunday");

2. ContainsKey
   This function checks whether a specified key exists or not.
   
   Syntax
   

   bool HashTable. Containskey (Key)
   ht.Contains("1");

3. ContainsValue
   This function checks whether the specified value exists in hash table or not.
   
   Syntax
   

   bool HashTable. ContainsValue(Value)
   ht.ContainsValue ("Sunday");

4. Remove
   This function will delete the specified key and the corresponding values.
   
   Syntax
   

   HashTable.Remove(key)
   ht.Remove ("1");

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