How can I implement validation in C#?

How can I implement validation in C#?

You can implement validation in C# using data annotations, custom validation attributes, or FluentValidation. What specific scenario do you have in mind?

I want to validate user input in a web application.

For web applications, you can use data annotations like [Required], [StringLength], and [EmailAddress] on your model properties. Would you like an example?

Yes, please provide an example of using data annotations.

Sure! Here's a simple example:

public class User
{
    [Required]
    [StringLength(50)]
    public string Name { get; set; }

    [EmailAddress]
    public string Email { get; set; }
}

This ensures that the Name is required and cannot exceed 50 characters, while Email must be a valid email format.