MySettings implementation with Validation using Data Annotations

1.Post.SettingsValidation.ConfigurationSettings.cs

public abstract class ConfigurationSettings
{
    public List<ValidationResult> ValidationResult = new List<ValidationResult>();

    public bool Validate() => Validator.TryValidateObject(
            this,
            new ValidationContext(this),
            ValidationResult,
            true);
}

2.Post.SettingsValidation.MySettings.cs

public class MySettings : ConfigurationSettings
{
	[Required]
	public string ApplicationName { get; set; }

	public string Author { get; set; }
}