C# String Remove() Method

In C#, the Remove() method of the String class is used for removing the characters from the specified position of a string. If the length is not specified, then it will remove all the characters after the specified position. This method can be overloaded by changing the number of arguments passed to it.

Example 1: Using String.Remove() method to remove the specified characters from a string.

// C# program to illustrate the
// String.Remove Method
using System;

class Geeks
{
    public static void Main(String[] args)
    {  
        // Creating a string
        string s = "GeeksforGeeks";

        // After using Remove(Int32) Method
        string res = s.Remove(5);
         
         // Original string
        Console.WriteLine("Original String: " + s);

        Console.WriteLine("Result: " + res);

    }
}

Original String: GeeksforGeeks
Result: Geeks

Explanation: In the above example, we use the Remove(int StartIndex) method which takes a single parameter as the starting index it will start to remove characters from the current String object. This method will continue to remove the characters till the end of the current string object.

Syntax of String Remove() Method

public string Remove(int StartIndex)

public string Remove(int StartIndex, int count)

Parameters:

• StartIndex: The index position from which it will start to remove characters from the current String object.
• count(optional): The count of the number of characters to be removed from the string.

Return Type:

• It will return the string of type System.String with the removed characters.

Exceptions: There can be two cases where exception ArgumentOutOfRangeException may occur

• Either StartIndex or (StartIndex + count) indicates a position which may be outside the current string object.
• StartIndex or count is less than zero.

Example 2: Using the Remove(int StartIndex) method to remove all the characters from the start index of a string.

// C# program to illustrate the 
// public string Remove(int StartIndex) 
using System; 

class Geeks
 { 
	public static void Main() 
	{ 

		// define string 
		String s = "GeeksForGeeks"; 

		Console.WriteLine("Original String : " + s); 

		// delete from index 4 to end of string 
		Console.WriteLine("New String1 : " + s.Remove(4)); 

		// delete character from index 5 to end of string 
		Console.WriteLine("New String2 : " + s.Remove(5)); 
	} 
} 

Original String : GeeksForGeeks
New String1 : Geek
New String2 : Geeks

Explanation: In the above example, we use the Remove(int StartIndex ) method and specified the StartIndex from which we want to delete the characters till the end.

Example 3: Using Remove(int StartIndex, int count) method with the count of characters to remove.

// C# program to illustrate the 
// public string Remove(int StartIndex, int count) 
using System; 

class Geeks
 { 
	public static void Main() 
	{ 
		// original string 
		String s = "GeeksForGeeks"; 

		Console.WriteLine("Given String : " + s); 

		// Remote character from index 5
		// and count 3
		String res = s.Remove(5, 3);
		System.Console.WriteLine("After Remove : " + res);

		// Remote character from index 5
		// and count 5
		res = s.Remove(0, 5);

		System.Console.WriteLine("After Remove : " + res);
	} 
} 

Given String : GeeksForGeeks
After Remove : GeeksGeeks
After Remove : ForGeeks

Explanation: In the above example, we use the Remove(startIndex, count) method and first we specify the index from which we want to remove the characters and the count of the number of characters to remove.

Important Points:

• Both above methods do not modify the value of the current string object. Instead, they return a new modified string because in C# strings are immutable and can not be modified.
• If StartIndex is equal to the length of the string and the length is zero, the method will not remove any character from the string.