C# | Substring() Method

1. String.Substring(Int32) Method
2. String.Substring(Int32, Int32) Method

String.Substring Method (startIndex)

public string Substring(int startIndex)

• Parameter: This method accept one parameter "startIndex". This parameter will specify the starting position of the substring which has to be retrieve. The type of this parameter is System.Int32.
• Return Value: This method will return the substring which begins from startIndex and continues to the end of the string. The return value type is System.String.

Input : str  = "GeeksForGeeks"
        str.Substring(5);
Output: ForGeeks

Input : str  = "GeeksForGeeks"
        str.Substring(8);
Output: Geeks

// C# program to demonstrate the 
// String.Substring Method (startIndex)
using System;
class Geeks {

    // Main Method
    public static void Main()
    {

        // define string
        String str = "GeeksForGeeks";

        Console.WriteLine("String    : " + str);

        // retrieve the substring from index 5
        Console.WriteLine("Sub String1: " + str.Substring(5));

        // retrieve the substring from index 8
        Console.WriteLine("Sub String2: " + str.Substring(8));
    }
}

String    : GeeksForGeeks
Sub String1: ForGeeks
Sub String2: Geeks

String.Substring Method (int startIndex, int length)

public string Substring(int startIndex, int length)

• Parameter: This method accept two parameters "startIndex" and length. First parameter will specify the starting position of the substring which has to be retrieve and second parameter will specify the length of the substring. The type of both the parameters is System.Int32.
• Return Value: This method will return the substring which begins from specified position and substring will have a specified length. The return value type is System.String.

1. if the parameters startIndex or length is less than zero.
2. If startIndex + length indicates a position which is not within current instance.

Input : str  = "GeeksForGeeks"
        str.Substring(0,8);
Output: GeeksFor

Input : str  = "GeeksForGeeks"
        str.Substring(5,3);
Output: For

Input : str  = "Geeks"
        str.Substring(4,0);
Output: 

// C# program to demonstrate the 
// String.Substring Method 
// (int startIndex, int length)
using System;
class Geeks {

    // Main Method
    public static void Main()
    {

        // define string
        String str = "GeeksForGeeks";

        Console.WriteLine("String    : " + str);

        // retrieve the substring from index 0 to length 8
        Console.WriteLine("Sub String1: " + str.Substring(0, 8));

        // retrieve the substring from index 5 to length 3
        Console.WriteLine("Sub String2: " + str.Substring(5, 3));
    }
}

String    : GeeksForGeeks
Sub String1: GeeksFor
Sub String2: For

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