EF 4.2 - MVC 3 - File Validation

ByteInfoAttribute.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;

namespace demo_002.Models
{
    public class ByteInfoAttribute : ValidationAttribute
    {
        // Todo from the web config - set default value
        // on the EF model : [ByteInfo (MaxContentSize = 2)]
        public int MaxContentSize = 10; // as MB       

        public override bool IsValid(object value)
        {
            var binaryInfo = value as byte[];            

            if (binaryInfo == null)
            {
                return true; // default is true
            }

            if (binaryInfo.Length > ((MaxContentSize / 1024) / 1024))
            {
                ErrorMessage = String.Format("Maximum sind : {0} MB erlaubt", MaxContentSize);
                return false;
            }           
            return base.IsValid(value);
        }
    }
}

CheckFileInfoAttribute.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;

namespace demo_002.Models
{
    public class CheckFileInfoAttribute : ValidationAttribute
    {
        public string[] CheckFileExtensions;
        public string[] CheckContentTypes;

        public override bool  IsValid(object value)
        {
            var fileInfo = value as string;
            if (fileInfo == null)
            {
                return true; // default is true
            }


            if (CheckFileExtensions != null)
            {
                if (!CheckFileExtensions.Contains(fileInfo))
                {
                    ErrorMessage = String.Format("Folgende Formate sind erlaubt : ", string.Join(", ", CheckFileExtensions));                    
                    return false;
                }
            }

            if (CheckContentTypes != null)
            {
                if (!CheckContentTypes.Contains(fileInfo))
                {
                    ErrorMessage = String.Format("Folgende MIME-Typen sind erlaubt : ", string.Join(", ", CheckContentTypes));
                    return false;
                }
            }
 	        return base.IsValid(value);
        }                
    }
}

tblProfile.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace demo_002.Models
{
    public class tblProfile
    {
        public int Id { get; set; }

        public string Name { get; set; }
        public string Vorname { get; set; }

        [ByteInfo(MaxContentSize = 2)]
        public byte[] Bild { get; set; }

        [CheckFileInfo(CheckFileExtensions = new string[]{ ".jepg", ".jpg", ".png"})]
        public string BildEndung { get; set; }

        [CheckFileInfo(CheckContentTypes = new string[]{"image/jpeg","image/png"})]
        public string BildType { get; set; }
    }
}