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Home Interviews How do you ensure a file is properly closed after reading or writing? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 05 May 2025
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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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