Updating database Image just stores 0x. C#

I have a table that stores information of users, which is filled by loading a XML file. In that table, I have an Image type column that is for all users set as "null" in the XML file. The problem comes when I try to update that column and set an image, it just stores "0x".

This is the table:

create table User(
ID INTEGER PRIMARY KEY,
name VARCHAR(50),
foto IMAGE,
email VARCHAR(100))

This is my update code:

protected void addFoto_Click(object sender, EventArgs e)
{
    Byte[] imgByte = null;
    if (file_upload.PostedFile != null)
    {
        HttpPostedFile File = file_upload.PostedFile;
        File.InputStream.Position = 0;
        imgByte = new Byte[File.ContentLength];
        File.InputStream.Read(imgByte, 0, File.ContentLength);
    }
    string sql = "update User set foto = @foto where email= @email";
    using(SqlCommand cmd = new SqlCommand(sql, con.getConexion()))
    {
        cmd.Parameters.AddWithValue("@email", Txtemail.Text.ToString());
        cmd.Parameters.AddWithValue("@foto", imgByte);
        con.open();
        cmd.ExecuteNonQuery();
        con.close();
    }
}

I tried adding

File.InputStream.Position = 0;

as the answer in this post, but still didn't work.

Can't save byte[] array data to database in C#. It's saving 0x

I also tried with the column type VARBINARY(MAX) with this code:

string sql = "update User set foto = @foto where email= @email";
using (SqlCommand cmd = new SqlCommand(sql, con.getConexion()))
{
   Stream fs = file_upload.PostedFile.InputStream;
   BinaryReader br = new BinaryReader(fs);
   Byte[] bytes = br.ReadBytes((Int32)fs.Length);
   cmd.Parameters.AddWithValue("@email", Txtemail.Text.ToString());
   cmd.Parameters.Add("@foto", SqlDbType.Binary).Value = bytes;
   con.open();
   cmd.ExecuteNonQuery();
   con.close();
}

Which just stored 0x000000... And finally, I also tried adding directly an image with:

System.Drawing.Image imag = System.Drawing.Image.FromStream(file_upload.PostedFile.InputStream);
cmd.Parameters.Add("foto", SqlDbType.Binary, 0).Value = ConvertImageToByteArray(imag, System.Drawing.Imaging.ImageFormat.Jpeg);

with no result.

If anyone can please tell me what I'm doing wrong I would be really grateful, and also excuse me if my english is not perfect.