C#

• Introduction
• Getting Output
• Datatype
• Variable Declaration
• Operator
• string concatenation
• Converting Datatype
• Getting input from user
• Working on Angles
• Escape Sequence
• Conditional Statements
• If statement
• Switch statement
• Types of Error
• Exception Handling
• Loop
• While Loop
• For Loop
• Do While Loop
• Array
• Foreach Loop
• Multi dimensional array
• Nested Loop
• Jump Statment
• String Handling Function
• Methods or Functions
• Passing Parameter
• Method Overloading
• Void Function
• Returning Function
• Class
• Creating New Instance
• Static Keyword
• Constructor
• Constructor Overloading
• Destructor
• Inheritance
• Multi Level Inheritance
• Multiple Inheritance
• Sealed Class
• Partial Class
• Upcasting
• Abstract Class
• Interface
• Ref,Out,In Parameters
• Field Vs Property
• Struct
• DateTime
• Enum
• Namespace
• Dynamic Link Library(DLL)
• Collections
• File Handling
• Excel handling

String Handling Functions

String is an object of String class that represent sequence of characters. We can perform many operations on strings such as concatenation, comparision, getting substring, search, trim, replacement etc using available functions called String handling Functions. The string can be declared by using the keyword string which is an alias for the System.String object. Let us discuss some available string handling functions with its definition.

Function Name	Description
ToUpper()	It is used to convert String into uppercase.
ToLower()	It is used to convert String into lowercase.
Substring(int)	The substring starts at a specified character position and continues to the end of the string.
IndexOf(String)	It is used to find the index value of specified characters.
Insert(int, String)	It is used to return a new string in which a specified string is inserted at a specified index position.
Replace(String, String)	It is used to return a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.
Split(Char)	It is used to split a string into substrings that are based on the characters in an array.
StartsWith(String)	It is used to check whether the beginning of this string instance matches the specified string.
Trim()	It is used to remove all leading and trailing white-space characters from the current String object.
TrimEnd()	It is used to remove all leading and trailing white-space characters in the end of current String object.
TrimStart()	It is used to remove all leading and trailing white-space characters in the start of current String object.
Contains(String)	It is used to return a boolean value indicating whether a specified substring occurs within this string.

TIP:
Just type string name and put '.' , Viusal studio IntelliSense will automatically suggest all the string handling functions. We can choose one from the suggestion.

CODE

EG 1 . Creating a string and working on some string handling functions.

static void Main(string[] args) {
    string name = "CodersCapsule";
    Console.WriteLine(name.ToUpper()); //Output : CODERSCAPSULE
    Console.WriteLine(name.ToLower()); //Output : coderscapsule
    Console.WriteLine(name.Substring(6)); //Output : Capsule
    Console.WriteLine(name.IndexOf("o")); //Output : 1
    Console.WriteLine(name.Contains("Code")); //Output : True
    Console.WriteLine(name.Replace("C","$")); //Output : $oders$apsule
}

Exercises
1. Get mail id from user, print out all characters before '@'
2. Take following coordinates as string "(25.6,17.89),(43.6,28.9)" , now apply string handling functions to store 25.6 as x1, 17.89 as y1, 43.6 as x2, 28.9 as y2. Now find slope and distance between 2 coordinates.

(Click Here, For more exercises)