How can I use attributes in ASP.NET?

How can I use attributes in ASP.NET?

Attributes in ASP.NET are used to add metadata to classes, methods, and properties. They can control behavior, validation, and more.

Can you give me an example of a custom attribute?

Sure! You can create a custom attribute by defining a class that inherits from System.Attribute. For example, a simple logging attribute could look like this:

[AttributeUsage(AttributeTargets.Method)]
public class LogAttribute : Attribute
{
    public string Message { get; }
    public LogAttribute(string message)
    {
        Message = message;
    }
}

How do I apply this custom attribute to a method?

You can apply the custom attribute by placing it above the method definition like this:

[Log("This method is being executed.")]
public void MyMethod()
{
    // Method implementation
}

What are some built-in attributes I should know about?

Some common built-in attributes include [Required], [StringLength], and [Range] for validation, and [HttpGet], [HttpPost] for routing in MVC.