Solution:Step 1: Understand Union methodUnion returns distinct elements from both lists combined.Step 2: Compare with other methodsConcat includes duplicates (3 appears twice); Union returns distinct elements from both lists; AddRange modifies list1 and returns void; Intersect returns only common el

[Solved] Given two Lists:var list1 = new List {1, 2, 3};var list2 = new List {3, 4, 5};How do you create a new List containing elements from both lists without duplicates? | C Sharp (C#)

C Sharp (C#) - Collections

Given two Lists:

var list1 = new List {1, 2, 3};
var list2 = new List {3, 4, 5};

How do you create a new List containing elements from both lists without duplicates?

Avar combined = list1.Concat(list2).ToList();

Bvar combined = list1.Union(list2).ToList();

Cvar combined = list1.AddRange(list2);

Dvar combined = list1.Intersect(list2).ToList();

Step-by-Step Solution

Solution:

Step 1: Understand Union method
Union returns distinct elements from both lists combined.
Step 2: Compare with other methods
Concat includes duplicates (3 appears twice); Union returns distinct elements from both lists; AddRange modifies list1 and returns void; Intersect returns only common elements.
Final Answer:
var combined = list1.Union(list2).ToList(); -> Option B
Quick Check:
Union merges lists without duplicates [OK]

Quick Trick: Use Union to merge lists uniquely [OK]

Common Mistakes:

MISTAKES

Using AddRange which returns void
Using Intersect for union
Using Concat without Distinct

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More C Sharp (C#) Quizzes

Given two Lists:

Step 1: Understand Union method

Step 2: Compare with other methods

Final Answer:

Quick Check:

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