C# Interview Questions

C# Interview Questions

In this article, I will share my ASP.NET C# interview experience with Questions and Answers.

1. What is Polymorphism in C# OOPs?

• The word Polymorphism means "One Name Many Forms".   
• In the object-oriented programming paradigm, polymorphism is often expressed as 'one interface, multiple functions' or 'one name with multiple functionalities'
• There are two types of polymorphism in C# - Static / Compile Time Polymorphism & Dynamic / Runtime Polymorphism.
• Static or Compile Time Polymorphism is also known as Early Binding. Method overloading is an example of Static Polymorphism
• Dynamic / Runtime Polymorphism is also known as late binding. Method overriding is an example of dynamic polymorphism.

2. How can you remove duplicate characters in a string?

The below program will remove the duplicate characters in a string.

using System;
using System.Linq;
using System.Collections.Generic;

namespace Demo {
   class Program {
      
      static void Main(string[] args) 
      {
          
         string value1 = RemoveDuplicateChars("aayryrtfhbfss");
            Console.Write(value1);   
      }
      
       static string RemoveDuplicateChars(string key)
    {
        string result = "";          
        foreach (char value in key)
        {
            // result.IndexOf(value) will give the position of the Character in a string, if Character not exist will return -1
            if (result.IndexOf(value) == -1)                   
                result += value;
                
        }
        return result;
    }
    
      
   }
}

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