MVC - HTML Form Input (+File)

*** Database table schema ***

CREATE TABLE [Service](
    [Id] [int] IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [Name] [nvarchar](128) NULL,
    [Description] [nvarchar](1024) NULL,
    [ImageUrl] [nvarchar](128) NULL)
GO

SET IDENTITY_INSERT Service ON
GO

INSERT INTO Service (Id, [Name], [Description], ImageUrl)
VALUES
    ( 1, 'Nesciunt Mete', 'Provident nihil minus qui consequatur non omnis maiores. Eos accusantium minus dolores iure perferendis.', '/images/services-1.jpg' ),
    ( 2, 'Eosle Commodi', 'Ut autem aut autem non a. Sint sint sit facilis nam iusto sint. Libero corrupti neque eum hic non ut nesciunt dolorem.', '/images/services-2.jpg' ),
    ( 3, 'Ledo Markt', 'Ut excepturi voluptatem nisi sed. Quidem fuga consequatur. Minus ea aut. Vel qui id voluptas adipisci eos earum corrupti.', '/images/services-3.jpg' ),
    ( 4, 'Asperiores Commodit', 'Non et temporibus minus omnis sed dolor esse consequatur. Cupiditate sed error ea fuga sit provident adipisci neque.', '/images/services-4.jpg' ),
    ( 5, 'Velit Doloremque', 'Cumque et suscipit saepe. Est maiores autem enim facilis ut aut ipsam corporis aut. Sed animi at autem alias eius labore.', '/images/services-5.jpg' ),
    ( 6, 'Dolori Architecto', 'Hic molestias ea quibusdam eos. Fugiat enim doloremque aut neque non et debitis iure. Corrupti recusandae ducimus enim.', '/images/services-6.jpg' )
GO

SET IDENTITY_INSERT Service OFF
GO

CREATE TABLE [dbo].[FormData](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[TestText] [nvarchar](128) NULL,
	[TestTel] [nvarchar](128) NULL,
	[TestUrl] [nvarchar](128) NULL,
	[TestEmail] [nvarchar](128) NULL,
	[TestNumber] [int] NULL,
	[TestPassword] [nvarchar](128) NULL,
	[TestCheckbox1] [bit] NULL,
	[TestCheckbox2] [bit] NULL,
	[TestRadio] [nvarchar](128) NULL,
	[TestColor] [nvarchar](128) NULL,
	[TestRange] [nvarchar](128) NULL,
	[TestDate1] [date] NULL,
	[TestDate2] [date] NULL,
	[TestDateTime] [datetime2](7) NULL,
	[TestMonth] [nvarchar](128) NULL,
	[TestTime] [nvarchar](128) NULL,
	[TestWeek] [nvarchar](128) NULL,
	[TestHidden] [nvarchar](128) NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
)
GO

CREATE TABLE [dbo].[FormDataFile](
	[Id] [int] NOT NULL,
	[FileContent] [nvarchar](max) NOT NULL,
	[Name] [nvarchar](128) NULL,
	PRIMARY KEY CLUSTERED ([Id] ASC)
)
GO

CREATE TABLE [dbo].[FormDataImage](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[FormDataId] [int] NOT NULL,
	[Name] [nvarchar](128) NOT NULL,
	[Content] [nvarchar](max) NOT NULL,
	[ContentType] [nvarchar](128) NOT NULL,
	PRIMARY KEY CLUSTERED ([Id] ASC)
)
GO

ALTER TABLE [dbo].[FormDataFile]
ADD CONSTRAINT [FK_FormDataFile_FormData] FOREIGN KEY([Id])
REFERENCES [dbo].[FormData] ([Id])
GO

ALTER TABLE [dbo].[FormDataImage]
ADD CONSTRAINT [FK_FormDataImage_FormData] FOREIGN KEY([FormDataId])
REFERENCES [dbo].[FormData] ([Id])
GO

*** Code for saving FormData to database ***

var formData = new FormDatum
{
    TestText = model.TestText,
    TestTel = model.TestTel,
    TestUrl = model.TestUrl,
    TestEmail = model.TestEmail,
    TestNumber = model.TestNumber,
    TestPassword = model.TestPassword,
    TestCheckbox1 = model.TestCheckbox1,
    TestCheckbox2 = model.TestCheckbox2,
    TestRadio = model.TestRadio,
    TestColor = model.TestColor,
    TestRange = model.TestRange,
    TestDate1 = model.TestDate1,
    TestDate2 = model.TestDate2,
    TestDateTime = model.TestDateTime,
    TestMonth = model.TestMonth,
    TestTime = model.TestTime,
    TestWeek = model.TestWeek,
    TestHidden = model.TestHidden,
};
_dbContext.FormData.Add(formData);

using (var memoryStream = new MemoryStream())
{
    model.TestFile.CopyTo(memoryStream);

    if (memoryStream.Length < 50 * 1024 * 1024)
    {
        var file = new FormDataFile()
        {
            IdNavigation = formData,
            FileContent = Convert.ToBase64String(memoryStream.ToArray())
        };
        _dbContext.FormDataFiles.Add(file);

        _dbContext.SaveChanges();
    }
    else
    {
        ModelState.AddModelError("File", "The file is too large.");
    }
}