C# Program to Remove Duplicate Characters from a String

C# Program to Remove Duplicate Characters from a String

Most of the IT companies check the coding skills and problem-solving skills as well along with the theoretical interview questions. Sometimes you are free to write the pseudo code and sometimes you are asked to write the complete program either on any paper or any editor. 

This question is asked in the coding interview to write the program. Here you can find the program as well as a live running program so that you can test the program immediately.

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Question: 

How can you find and remove the duplicate characters from a string? Write a program to remove the duplicate characters from a string.

C# Program To Delete the Duplicate Characters in a String

       
 

// Author 	: Tech Point Fundamentals
// Website 	: www.techpointfunda.com
// Channel	: https://www.youtube.com/c/TechPointFundamentals
// Demo		: Removing Duplicate Characters

using System;
using System.Linq;

public class Program
{
  public static void Main()
  { 
	string inputString = "Tech Point Fundamentals";		
	
	Console.WriteLine("Input String : " + inputString);		
	Console.WriteLine("After Removing Duplicate (Case Sensitive) Characters By IndexOf Method : " + RemovingDuplicateCharacters(inputString));	
	Console.WriteLine("After Removing Duplicate (Case Sensitive) Characters By LINQ : " + RemovingDuplicateCharactersByLINQ(inputString));
  }	  	
	
public static string RemovingDuplicateCharacters(string inputString)    
{               
  string output = string.Empty;  
  
  foreach (char ch in inputString)
  {
  	if (output.IndexOf(ch) == -1)
  	{
  		output += ch;
  	}
  }  
  return output;
}    
	
public static string RemovingDuplicateCharactersByLINQ(string inputString) 
{
  return new string(inputString.ToCharArray().Distinct().ToArray());
}	
}

Output: 

Input String : Tech Point Fundamentals

After Removing Duplicate (Case Sensitive) Characters By IndexOf Method : Tech PointFudamls

After Removing Duplicate (Case Sensitive) Characters By LINQ : Tech PointFudamls

Live Demo

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