How do you ensure a file is properly closed after reading or writing?

Question

ICSM Computer · Answer

To ensure a file is properly closed after reading or writing in C#, you should use the
using statement. It guarantees that the FileStream (or any
IDisposable object) is automatically closed and disposed, even if an exception occurs.
Recommended: Use using
using (FileStream fs = new FileStream("example.txt", FileMode.OpenOrCreate, FileAccess.Write))
{
    byte[] data = System.Text.Encoding.UTF8.GetBytes("Hello");
    fs.Write(data, 0, data.Length);
} // FileStream is automatically closed here
Without using (not recommended unless managed manually)
FileStream fs = null;
try
{
    fs = new FileStream("example.txt", FileMode.OpenOrCreate, FileAccess.Write);
    byte[] data = System.Text.Encoding.UTF8.GetBytes("Hello");
    fs.Write(data, 0, data.Length);
}
finally
{
    if (fs != null)
        fs.Close(); // Must ensure it's always closed
}
Using using is cleaner and less error-prone.

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How do you ensure a file is properly closed after reading or writing?

ICSM Computer

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1 Answers

Recommended: Use `using`

Without `using` (not recommended unless managed manually)

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