Attribute for to read configuration and the reader to read application setting file (app/web.config)

AppSettingAtrribute.cs

using System;
using System.Linq;

public class AppSettingAttribute : Attribute
{
    public string Name { get;  }
    public string DefaultValue { get;  }

    public AppSettingAttribute(string name)
    {
        Name = name;
    }

    public AppSettingAttribute(string name, string defaultValue)
    {
        Name = name;
        DefaultValue = defaultValue;
    }
}

public interface IConfigurationReader
{
    T Load<T>() where T : class, new();
    object Load(Type type);
}
public class ConfigurationReader : IConfigurationReader {
    public T Load<T>() where T : class, new() => Load(typeof(T)) as T;

    public object Load(Type type)
    {
        var instance = Activator.CreateInstance(type);
        var prop = type.GetProperties().Where(x => x.CustomAttributes.Any(y => y.AttributeType == typeof(AppSettingAttribute)));

        foreach (var p in prop)
        {
            var appconfig = (AppSettingAttribute)p.GetCustomAttributes(typeof(AppSettingAttribute), true).FirstOrDefault();
            if (appconfig != null)
            {
                var value = new System.Configuration.AppSettingsReader().GetValue(appconfig.Name, p.PropertyType) ?? appconfig.DefaultValue;
                p.SetValue(instance, Convert.ChangeType(value, p.PropertyType), null);
            }
        }

        return instance;
    }
}