How to retrieve LONGBLOB image from mysql in picturebox

Hello,
I need to retrieve the longblob of a picture from mysql.

So first I insert it in the database with this:

Here is to retrieve the picture :

public static Bitmap ByteToImage(byte[] blob)
{
MemoryStream mStream = new MemoryStream();
byte[] pData = blob;
mStream.Write(pData, 0, Convert.ToInt32(pData.Length));
Bitmap bm = new Bitmap(mStream, false);
mStream.Dispose();
return bm;
}
MySqlDataAdapter sda = new MySqlDataAdapter("SELECT * FROM tb_produits WHERE Designation='" + Designation + "'and Reference='" + Reference + "'", MyConnexion);
DataTable dt = new DataTable();
sda.Fill(dt);
if (dt.Rows.Count == 1)
{
byte[] img = (byte[])dt.Rows[0]["Image"];
PIC_Image.Image = ByteToImage(img);
}

I tried to retrieve but I got an error:
Parameter is not valid in this line " Bitmap bm = new Bitmap(mStream, false);"