[Solved] The following code is intended to check if two s... What is the error?string a = "Hello";string b = "hello";if (a == b.ToLower()){ Console.WriteLine("Equal");} else { Console.WriteLine("Not Equal");} | C Sharp (C#)

C Sharp (C#) - Strings and StringBuilder

The following code is intended to check if two strings are equal ignoring case, but it does not work as expected. What is the error?

string a = "Hello";
string b = "hello";
if (a == b.ToLower())
{
    Console.WriteLine("Equal");
} else {
    Console.WriteLine("Not Equal");
}

AThe code should use 'string.Compare(a, b)' without ToLower()

Bb.ToLower() returns null, causing error

CThe code should use 'a.Equals(b)' instead

DUsing '==' compares case-sensitively, so it fails here

Step-by-Step Solution

Solution:

Step 1: Analyze '==' operator behavior
The '==' operator compares strings case-sensitively, so "Hello" != "hello".
Step 2: Understand why ToLower() doesn't fix it
Comparing 'a' to 'b.ToLower()' still compares case-sensitively; 'a' is "Hello" (mixed case), so comparison fails.
Final Answer:
Using '==' compares case-sensitively, so it fails here -> Option D
Quick Check:
'==' is case-sensitive, so this check fails [OK]

Quick Trick: Use string.Equals with ignore case instead of == [OK]

Common Mistakes:

MISTAKES

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The following code is intended to check if two strings are equal ignoring case, but it does not work as expected. What is the error?