Question

You want to copy the contents of one text file to another using StreamReader and StreamWriter. Which code snippet correctly performs this task?

Accepted Answer

using (var reader = new StreamReader("source.txt")) {
    using (var writer = new StreamWriter("dest.txt")) {
        string line;
        while ((line = reader.ReadLine()) != null) {
            writer.WriteLine(line);
        }
    }
}

Answer

using (var reader = new StreamReader("source.txt")) {
    string content = reader.ReadToEnd();
    var writer = new StreamWriter("dest.txt");
    writer.Write(content);
}

Answer

using (var writer = new StreamWriter("dest.txt")) {
    using (var reader = new StreamReader("source.txt")) {
        string line;
        while ((line = reader.ReadLine()) != null) {
            writer.WriteLine(line);
        }
    }
}

Answer

var reader = new StreamReader("source.txt");
var writer = new StreamWriter("dest.txt");
string line = reader.ReadLine();
while (line != null) {
    writer.WriteLine(line);
    line = reader.ReadLine();
}
reader.Close();
writer.Close();

You want to copy the contents of one text file to another using StreamReader and StreamWriter. Which code snippet correctly performs this task?

Step 1: Check proper resource management

Step 2: Verify reading and writing logic

Final Answer:

Quick Check:

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