C# return result class

Result.cs

using System;

namespace Sample.Common
{
    public class Result
    {
        public bool Successed { get; set; }
        public string Message { get; set; }
        public string Description { get; set; }
        public Exception Exception { get; set; }

        public static Result Success()
        {
            return Success(null, null);
        }

        public static Result Success(string message = null, string description = null)
        {
            return new Result
            {
                Successed = true,
                Message = message,
                Description = description
            };
        }

        public static Result Failed(string message, string description = null)
        {
            return new Result
            {
                Successed = false,
                Message = message,
                Description = description
            };
        }

        public static Result Failed(Exception ex)
        {
            return new Result
            {
                Successed = false,
                Message = ex.Message,
                Description = ex.ToString(),
                Exception = ex
            };
        }
    }
    
    public class Result<T> : Result
    {
        public T Value { get; private set; }
        public static Result<T> Success(T result = default(T))
        {
            return Success(null, null, result);
        }

        public static Result<T> Success(string message = null, string description = null, T result = default(T))
        {
            return new Result<T>
            {
                Successed = true,
                Message = message,
                Description = description,
                Value = result
            };
        }

        public static Result<T> Failed(string message = null, string description = null, T result = default(T))
        {
            return new Result<T>
            {
                Successed = false,
                Message = message,
                Description = description,
                Value = result
            };
        }

        public static Result<T> Failed(Exception ex, T result = default(T))
        {
            return new Result<T>
            {
                Successed = false,
                Message = ex.Message,
                Description = ex.ToString(),
                Exception = ex,
                Value = result
            };
        }
    }
}