C# String Substring() (With Examples) - Programiz

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C# String Methods

• C# String Format()
• C# String Split()
• C# String Substring()
• C# String Compare()
• C# String Replace()
• C# String Contains()
• C# String Join()
• C# String Concat()
• C# String Trim()
• C# String Equals()
• C# String IndexOf()
• C# String LastIndexOf()
• C# String Remove()
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• C# String ToLower()
• C# String EndsWith()
• C# String StartsWith()
• C# String ToCharArray()
• C# String PadLeft()
• C# String PadRight()

C# Tutorials

• C# String Replace()
• C# String ToCharArray()
• C# String IndexOf()
• C# String EndsWith()
• C# String LastIndexOf()
• C# String

C# String Substring()

The Substring() method returns a substring from the given string.

Example

using System; namespace CsharpString { class Test { public static void Main(string[] args) { string text = "C# is fun"; // Returns substring of length 3 from index 6 Console.WriteLine(text.Substring(6, 3)); Console.ReadLine(); } } } // Output: fun

Substring() Syntax

The syntax of the string Substring() method is:

Substring(int startIndex, int length)

Here, Substring() is a method of class String.

Substring() Parameters

The Substring() method takes the following parameters:

• startIndex - the beginning index of the substring
• length - (optional) - length of the substring

Substring() Return Value

The Substring() method returns a substring from the given string.

Example 1: C# Substring() Without Length

using System; namespace CsharpString { class Test { public static void Main(string[] args) { string text = "Programiz"; // Returns substring from the second character string result = text.Substring(1); Console.WriteLine(result); Console.ReadLine(); } } }

Output

rogramiz

Notice this line in the above example:

string result = text.Substring(1);

The code text.Substring(1) returns the substring from the second character of "Programiz".

Example 2: C# Substring() With Length

using System; namespace CsharpString { class Test { public static void Main(string[] args) { string text = "Programiz is for programmers"; // Returns substring of length 9 from the first character string result = text.Substring(0, 9); Console.WriteLine(result); Console.ReadLine(); } } }

Output

Programiz

Notice this line in the above example:

string result = text.Substring(0, 9);

Here,

• 0 (the first character of text) is the beginning index of the substring
• 9 is the length of the substring

This gives us the substring "Programiz".

Example 3: C# Substring() Before Specific Character

using System; namespace CsharpString { class Test { public static void Main(string[] args) { string text = "C#. Programiz"; // Returns substring from index 0 to index before '.' string result = text.Substring(0, text.IndexOf('.')); Console.WriteLine(result); Console.ReadLine(); } } }

Output

C#

Here, text.IndexOf('.') gives the length of the substring, which is the index of '.'.

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