[Solved] Which statement about the C# string method IndexOf is TRUE? - Ans: It returns -1 if the substring is not found | C Sharp (C#)

C Sharp (C#) - Strings and StringBuilder

Which statement about the C# string method IndexOf is TRUE?

AIt returns the last index of a substring in the string

BIt only works with single characters, not strings

CIt throws an exception if substring is missing

DIt returns -1 if the substring is not found

Step-by-Step Solution

Solution:

Step 1: Understand IndexOf behavior
IndexOf returns the first index of the substring or -1 if not found.
Step 2: Evaluate options
It does not throw exceptions and works with strings and chars.
Final Answer:
It returns -1 if the substring is not found -> Option D
Quick Check:
IndexOf returns -1 when missing [OK]

Quick Trick: IndexOf returns -1 if substring missing [OK]

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Which statement about the C# string method IndexOf is TRUE?