Hash Tables in C# - How to use and when to use?

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Hastables in C# - how and when to use?
In this video you will learn all about hastables in C#
When to use hastables and how to use hashtables
In this lesson we will learn about Hashtables and dictionaries
Which are one of the most useful collections in C#. We will see how to define them and how to use them and in which case scenarios we should take advantage of them.
To understand the concept of hashing and tables first think about a real dictionary
Assume we have a German/English Dictionary where every word in German corresponds to only one word in English. So when we try and translate the word 'Auto' in German, which translates to 'Car' in English, we used one word as a keyword to search, and we got the translation as a result
Defining a Hashtable
While we are at it, let's put our last example into action, and let's implement a simple application that will create few objects of type 'Student' and store them into a hashtable using their IDs as keys and the object itself as a value.
Adding Entries to our Hashtable
Now we can define and initialize few objects of our Student class
After we initialize them we will add them to our Hashtable we will use our student Id property as a key and the object it self as the value like we discussed earlier
Fetching Entries from our Hashtable
Now let's try fetching the data from our hashtable
We have a few options
The simplest one if we want to access an element that we already have its key is by accessing it using the hashtable object followed by [] just like an array
Since Hashtables are a non-generic collections they will return an object which before we start working with we have to cast it back to type Student
This is exactly how hashtables and dictionaries in C# behave we use a key to get a value.
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