using statement in C#

By: Rajesh P.S.

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What is the use of using statement in C# ?

The using statement is primarily used for automatic resource management. It provides a convenient and efficient way to work with objects that implement the IDisposable interface. The primary purpose of the using statement is to ensure that any resources acquired by an object that implements IDisposable are properly released or disposed of, regardless of whether an exception occurs during the code execution.

How the using statement works in C#?

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Automatic Resource Management

When you create a variable using the using statement, the compiler generates a try-finally block under the hood. The resource is acquired within the using block and is automatically released or disposed of at the end of the using block, ensuring proper resource management.

IDisposable Interface

The IDisposable interface defines a method named Dispose(), which is responsible for releasing any unmanaged resources held by the object. This could include file handles, network connections, or any other resources that are not automatically managed by the .NET runtime.

Here's the basic syntax of the using statement in C#:

using (ResourceType resource = new ResourceType()) { // Code to work with the resource // The resource will be automatically disposed of after this block }

Using FileStream

Suppose we want to read the contents of a file using the FileStream class. The FileStream class implements IDisposable, so we can use the using statement to ensure that the file handle is properly closed when we are done with it:

using (FileStream fileStream = new FileStream("example.txt", FileMode.Open)) { // Read from the file using the fileStream object // The fileStream will be automatically closed at the end of this block }

Using SqlConnection

When working with a database connection, we can also use the using statement to ensure that the connection is properly closed and returned to the connection pool:

using (SqlConnection connection = new SqlConnection("connectionString")) { // Open the database connection connection.Open(); // Execute SQL commands or queries using the connection // The connection will be automatically closed at the end of this block }

Conclusion

In both examples, the using statement ensures that the resources (FileStream and SqlConnection) are properly disposed of, even if an exception occurs during the execution of the code within the using block. This helps in preventing resource leaks and improves the overall robustness and reliability of the application.

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