String Functionality

Question

Hello,

My name is Kinjal.

I have just strated to learn C# language. So I need your help to make some programs. My Main Question is How many Functionalities are given by C# for String? And Which?

Please Give your response..

 

I wanna find by functionality

1. Any string like "eg" i have written which is located at which place in Sting or Sentence which is already given

2. Number of Words that can be search by string

3. Any Specific word is how many times being in sentence

etc... like this questions...