Different Type of String Operations in .NET using C#

In .NET C#, there are several types of string operations like – calculate length, substring operations, case change, replace, character array, string array. There are already predefined functions available for these operations. You just need to use those by following the rules.

In this tutorial, You are going to learn some popular operations of string in C# programming. Let’s discuss some operations with examples:

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Count the length of a string

In the example below, we are counting the length of the string:

string str = "Welcome to Codespeedy";
Console.WriteLine(str.Length);

Output:

Length of the string:21

As you can see from the output, it returns the length of the characters from the string.

Find substring from a given string

Here is another example, where I am searching if a substring present in the string or not:

string str = "Welcome to Codespeedy";
string result1 = str.Substring(11);       //Define only starting position. Print data from starting position to end of string
string result2 = str.Substring(0, 7);     //Define starting position, lentgh. Print data of that length from starting given position. 
Console.WriteLine(result1);
Console.WriteLine(result2);

Output:

Codespeedy
Welcome

Change case of a string

You can also change the case of a string. You can convert all the characters of the string to lowercase using ToLower() method or to uppercase using the ToUpper() method. Below is shown an example:

string str = "Welcome to Codespeedy";
Console.WriteLine(str.ToLower());     //Convert to Lower case letter
Console.WriteLine(str.ToUpper());     //Convert to Upper case letter

Output:

welcome to codespeedy
WELCOME TO CODESPEEDY

Replace character of  a string

Here we will replace an old character with a new character in the given string using the Replace() method:

string str = "Welcome to Codespeedy";
Console.WriteLine(str.Replace('s', 'S'));

Output:

Welcome to CodeSpeedy

Convert string to a character array

Here we will convert a string to an array of characters

string str = "Welcome to Codespeedy";
char[] c = str.ToCharArray();
foreach (char item in c)
{
     Console.WriteLine(item);
}

Output:

W
e
l
c
o
m
e

t
o

C
o
d
e
s
p
e
e
d
y

Store a string to string array

Here we will store a string into an array of strings. We will use space as the separator and break the string into parts:

string str = "Welcome to Codespeedy";
string[] res1 = str.Split(' ');         //Split the string into different parts by seperator blankspace
foreach (string item in res1)
{
    Console.WriteLine(item);
}

Output:

Welcome
to
Codespeedy