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You need to read from two files sequentially and ensure both file streams are properly disposed of after use. Which of the following code snippets correctly uses using statements to achieve this?

hard🚀 Application Q8 of 15
C Sharp (C#) - Exception Handling
You need to read from two files sequentially and ensure both file streams are properly disposed of after use. Which of the following code snippets correctly uses using statements to achieve this?
Ausing (var file1 = new FileStream("file1.txt", FileMode.Open)) using (var file2 = new FileStream("file2.txt", FileMode.Open)) { // read from file1 and file2 }
Busing (var file1 = new FileStream("file1.txt", FileMode.Open)) { // read from file1 } using (var file2 = new FileStream("file2.txt", FileMode.Open)) { // read from file2 }
Cvar file1 = new FileStream("file1.txt", FileMode.Open); var file2 = new FileStream("file2.txt", FileMode.Open); // read files file1.Dispose(); file2.Dispose();
Dusing var file1 = new FileStream("file1.txt", FileMode.Open); using var file2 = new FileStream("file2.txt", FileMode.Open); // read files
Step-by-Step Solution
Solution:

  1. Step 1: Understand resource lifetime

    Each using statement ensures the resource is disposed at the end of its block.

  2. Step 2: Analyze options

    using (var file1 = new FileStream("file1.txt", FileMode.Open)) using (var file2 = new FileStream("file2.txt", FileMode.Open)) { // read from file1 and file2 } nests both using statements in one block, which means both files are open simultaneously. This is valid but may not be ideal if files are read sequentially. using (var file1 = new FileStream("file1.txt", FileMode.Open)) { // read from file1 } using (var file2 = new FileStream("file2.txt", FileMode.Open)) { // read from file2 } uses separate using blocks, disposing each file immediately after use, which is best for sequential reading. var file1 = new FileStream("file1.txt", FileMode.Open); var file2 = new FileStream("file2.txt", FileMode.Open); // read files file1.Dispose(); file2.Dispose(); manually disposes resources but lacks exception safety. using var file1 = new FileStream("file1.txt", FileMode.Open); using var file2 = new FileStream("file2.txt", FileMode.Open); // read files uses C# 8.0 using declarations which keep resources alive until the end of the method, not immediately after use.

  3. Final Answer:

    using (var file1 = new FileStream("file1.txt", FileMode.Open)) { // read from file1 } using (var file2 = new FileStream("file2.txt", FileMode.Open)) { // read from file2 } correctly disposes each file immediately after its use in separate blocks.

  4. Quick Check:

    Separate using blocks dispose resources immediately [OK]
Quick Trick: Use separate using blocks for sequential resource disposal [OK]
Common Mistakes:
MISTAKES
  • Nesting using blocks unnecessarily
  • Not disposing resources immediately after use
  • Manually calling Dispose without try-finally

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