What is the using statement used for?

Question

ICSM Computer · Answer

The using statement in C# is used for automatically managing the lifetime of disposable resources—typically unmanaged resources like files, database connections, streams, etc.
Purpose:
The using statement ensures that the object’s Dispose() method is called
automatically, even if an exception occurs. This helps:
Prevent memory leaks.Release file handles or DB connections properly.Keep resource management safe and concise.
Syntax:
using (var resource = new SomeDisposableResource())
{
    // Use the resource
}
// resource.Dispose() is called automatically here
Applies to:
Any class that implements the IDisposable interface, such as:
StreamReader, FileStream, SqlConnectionXmlWriter, MemoryStream, HttpClient
Example:
using (var file = new StreamReader("file.txt"))
{
    string content = file.ReadToEnd();
}
// StreamReader.Dispose() is automatically called here
C# 8.0+:
In newer versions of C#, you can use a using declaration:
using var file = new StreamReader("file.txt");
// No need for braces; file is disposed at the end of the scope

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What is the using statement used for?

Anubhav Kumar

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1 Answers

Purpose:

Syntax:

Applies to:

Example:

C# 8.0+:

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