C# Substring() Method

The Substring() method in C# is used to retrieve a substring from this instance. The substring starts at a specified character position and continues to the end of the string.

Syntax

The syntax is as follows -

public string Substring (int begnIndex);
public string Substring (int begnIndex, int len);

Above, begnIndex is the zero-based starting character position of a substring in this instance. The len parameter is the number of the substring to retrieve

Example

Let us now see an example -

using System;
public class Demo {
   public static void Main(String[] args) {
      string str1 = "Katherine";
      string str2 = "PQRS";
      Console.WriteLine("String1 = "+str1);
      Console.WriteLine("String1 ToUpperInvariant = "+str1.ToUpperInvariant());
      Console.WriteLine("String1 Substring from index4 = " + str1.Substring(4));
      Console.WriteLine("\nString2 = "+str2);
      Console.WriteLine("String2 ToUpperInvariant = "+str2.ToLowerInvariant());
      Console.WriteLine("String2 Substring from index2 = " + str2.Substring(2));
   }
}

Output

String1 = Katherine
String1 ToUpperInvariant = KATHERINE
String1 Substring from index4 = erine
String2 = PQRS
String2 ToUpperInvariant = pqrs
String2 Substring from index2 = RS

Example

Let us now see another example -

using System;
public class Demo {
   public static void Main(String[] args) {
      string str1 = "Notebook";
      string str2 = "Ultrabook";
      Console.WriteLine("String1 = "+str1);
      Console.WriteLine("String1 ToUpperInvariant = "+str1.ToUpperInvariant());
      Console.WriteLine("String1 Substring from index4 = " + str1.Substring(4, 4));
      Console.WriteLine("\nString2 = "+str2);
      Console.WriteLine("String2 ToUpperInvariant = "+str2.ToLowerInvariant());
      Console.WriteLine("String2 Substring from index2 = " + str2.Substring(0, 5));
   }
}

Output

String1 = Notebook
String1 ToUpperInvariant = NOTEBOOK
String1 Substring from index4 = book
String2 = Ultrabook
String2 ToUpperInvariant = ultrabook
String2 Substring from index2 = Ultra