L&T interview

1:Remove duplicates and spaces L&T 
2:fetch and pull
3:types of memories
4:try catch implimentations
5:var and nvarchar
6:entity ado major difference
7:localization in sql(for lanaguage specific  save)
using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{

public static void Main()

{

var data = "Hello world";

Console.WriteLine(data.Replace(" ","").ToCharArray().Distinct().ToArray());

2.git fetch and pull difference

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        string data = "Hello world";
        HashSet<char> seen = new HashSet<char>();
        string result = "";

        foreach (char c in data)
        {
            if (c != ' ' && !seen.Contains(c)) // Ignore spaces and duplicates
            {
                seen.Add(c);
                result += c;
            }
        }

        Console.WriteLine(result); // Output: Helowrd
    }
}

Explanation

1. Use a HashSet<char> to store unique characters.
2. Loop through each character in the string.
3. Skip spaces (c != ' ') and only add characters if they haven’t been seen before (!seen.Contains(c)).
4. Build the result string without duplicates.

---

Why Use HashSet?

• Faster lookup (O(1) time complexity for checking if a character is already seen).
• Efficient way to remove duplicates compared to nested loops.

Difference Between git fetch and git pull

Both git fetch and git pull are used to get updates from a remote repository, but they work differently.

Feature	git fetch	git pull
Operation	Downloads changes from the remote repository but does not merge them	Downloads changes and automatically merges them into the current branch
Merging	No merging; updates only the remote-tracking branches	Merges remote changes into the current branch
Use Case	When you want to check for updates before merging	When you want to update your local branch immediately
Risk	No risk; does not change the working directory	Potential conflicts if changes clash with local work
Command Example	git fetch origin	git pull origin main