Can you explain the purpose of the 'using' construct in C# and how it is used for resource management?

The using construct in C# is used for automatic management of the lifetime of objects that implement the IDisposable interface. It ensures that the Dispose() method is called to release resources (such as file handles, network connections) immediately after exiting the using block.

Example of usage:

using (var file = new StreamReader("file.txt"))
{
    string content = file.ReadToEnd();
    // Work with the file
} // Here, file.Dispose() is automatically called

Thus, using helps prevent resource leaks and simplifies code by freeing the programmer from the need to explicitly call Dispose().