LINQ Interview QuestionsWhat is LINQ?Explain the main benefits of LINQWhat are the different types of LINQ?What is the difference between LINQ to Objects and LINQ to SQL?What are different methods to write LINQ Query in C#?Explain the concept of deferred loading in LINQ to SQL.What is eager loading in LINQ?What is lazy loading in LINQ?Can you disable lazy/deferred loading?What is explicit loading in LINQ?What is IQueryable in LINQ?What is the difference between IQueryable and IEnumerable?What are lambda expressions in LINQ?What is Can we use ref and out paramters in lambda expression? if declared outside?What is LINQ provider and explain different types of LINQ providers?What are advantages of LINQ over DataSet?What is the difference between LINQ and stored procedures?What are the disadvantages of LINQ over stored procedure?Difference between ADO.Net and LINQ to SQL?How can you handle concurrency in LINQ to SQL?How can you handle concurrency at field level in LINQ to SQL?What is the purpose of "Any" operator in LINQ?What is the purpose of "All" operator in LINQ?What is the difference between "Any" and "All" operators in LINQ?What is the purpose of "Contains" operator in LINQ?What is the difference between "Any" and "Contains" operators in LINQ?What is the purpose of "Count" operator in LINQ?What is the purpose of "Min" operator in LINQ?What is the purpose of "Max" operator in LINQ?What is the purpose of "Sum" operator in LINQ?What is the purpose of "Average" operator in LINQ?What is the purpose of "ToList" operator in LINQ?What is the purpose of "ToArray" operator in LINQ?What is the difference between "ToList" and "ToArray" methods in LINQ?What is the purpose of "ToDictionary" operator in LINQ?What is the purpose of "ToLookup" operator in LINQ?What is the purpose of "Cast" operator in LINQ?What is the purpose of "First" operator in LINQ?What is the purpose of "FirstOrDefault" operator in LINQ?What is the difference between First and FirstOrDefault in LINQ?What is the purpose of "Single" operator in LINQ?What is the purpose of "SingleOrDefault" operator in LINQ?What is the difference between "Single" and "SingleOrDefault" in LINQ?What is the purpose of "Last" operator in LINQ?What is the purpose of "LastOrDefault" operator in LINQ?What is the difference between "Last" and "LastOrDefault" in LINQ?What is the purpose of "Where" operator in LINQ?What is the use of "Select" operator in LINQ?When to use "SelectMany" operator in LINQ?What is the difference between "Select" and "SelectMany" in LINQ?What is the purpose of "OrderBy" clause in LINQ?What is the purpose of "GroupBy" clause in LINQ?What is the usage of "Having" clause in LINQ?What is the purpose of "Distinct" method in LINQ?How do you use the "Distinct" method with a custom equality comparer in LINQ?What is the purpose of "Concat" method in LINQ?What is the purpose of "Skip" method in LINQ?What is the purpose of "Take" method in LINQ?
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What is the purpose of "Concat" method in LINQ?

The Concat method in LINQ serves the purpose of combining two or more sequences or collections into a single sequence. It allows you to concatenate, or join together, the elements from multiple sources, creating a new sequence that contains all the items from each source in the specified order. This can be valuable when you need to merge data from different collections or when you want to create a larger collection from smaller ones.

Here's the syntax of the Concat method in LINQ: 


IEnumerable<TSource> result = sequence1.Concat(sequence2);
  • 'sequence1' and 'sequence2' represent the collections or sequences that you want to concatenate.

Here's a complete source code example to illustrate the usage of the Concat method along with its output:


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

class Program
{
    static void Main()
    {
        // Create two lists of integers
        List list1 = new List { 1, 2, 3 };
        List list2 = new List { 4, 5, 6 };

        // Use LINQ to concatenate the two lists
        IEnumerable concatenatedList = list1.Concat(list2);

        Console.WriteLine("List 1: " + string.Join(", ", list1));
        Console.WriteLine("List 2: " + string.Join(", ", list2));
        Console.WriteLine("Concatenated List: " + string.Join(", ", concatenatedList));
    }
}

Output:


List 1: 1, 2, 3
List 2: 4, 5, 6
Concatenated List: 1, 2, 3, 4, 5, 6

In this example, we have two lists of integers, list1 and list2. Using the Concat method in LINQ, we merge these two lists into a single sequence called concatenatedList.

The result is a new sequence that contains all the elements from both list1 and list2. As demonstrated in the output, the Concat method effectively combines the data from the two lists, creating a larger and concatenated list of integers.

So, the Concat method in LINQ is a valuable tool for merging data from multiple sources into a single sequence, simplifying the process of working with combined or aggregated data.

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