Which of the following is the correct syntax to extract a substring starting at index 2 with length 4 from string str?

easy📝 Syntax Q3 of 15

C Sharp (C#) - Strings and StringBuilder

Which of the following is the correct syntax to extract a substring starting at index 2 with length 4 from string str?

Astr.SubString(2, 4);

Bstr.SubStr(2, 4);

Cstr.Substring(4, 2);

Dstr.Substring(2, 4);

Step-by-Step Solution

Solution:

Step 1: Recall correct method name and parameters
The method is Substring with capital S, taking start index and length as parameters.
Step 2: Check parameter order and spelling
Start index is 2, length is 4, so Substring(2, 4) is correct. Other options have wrong casing or parameter order.
Final Answer:
str.Substring(2, 4); -> Option D
Quick Check:
Substring syntax = Substring(start, length) [OK]

Quick Trick: Substring method uses start index then length [OK]

Common Mistakes:

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