Getting red question mark when using Texture2D.LoadImage!

So yesterday i wrote some code to open and save images from unity. I save them as byte in my database. But the problem comes when i try to load them. I’m using Texture2D.LoadImage(byte,bool) for that job but it doesn’t seem to work. I’m getting a red question mark on my image when i try to load something. Every answer will be appreciated.
Here’s the code:

public void LoadFile()
    {
        IDbCommand comLA = con.CreateCommand();
        comLA.CommandText = "SELECT * from pics";
        IDataReader reader;
        reader =  comLA.ExecuteReader();
        string bytes = "";
        while (reader.Read())
        {
            bytes = reader.GetString(0);
        }
        reader.Close();
        imageBytes = StringToByteArray(bytes);
        ByteArrayToImage();


    }

    public void ByteArrayToImage()
    {
        Texture2D imageTex = new Texture2D(1, 1);
        imageTex.LoadImage(imageBytes, true);
        Sprite sprite = Sprite.Create(imageTex, new Rect(0.0f, 0.0f, imageTex.width, imageTex.height), new Vector2(0.5f, 0.5f), 100.0f);
        i.sprite = sprite;

    }

    public byte[] StringToByteArray(string data)
    {
        var bytes = System.Text.Encoding.Unicode.GetBytes(data);
        return bytes;
    }

Same problem here, did you find any solution?