Watermark Image and save to database in ASP.Net using C#

sir,

     i want to save water marked image to database.i have done watermarking,but save the image it does not save to database.i don't know what happend.

following are my code,

 Bitmap original_image = new Bitmap(FileUpload1.FileContent);
        string sWaterMark = "reshu";//String to be watermarked
        int fontsize = ((original_image.Width * 2) / (sWaterMark.Length * 3));
        int x = original_image.Width / 2;
        int y = original_image.Height * 9 / 20;

        StringFormat drawFormat = new StringFormat();
        drawFormat.Alignment = StringAlignment.Center;
        drawFormat.FormatFlags = StringFormatFlags.NoWrap;

        //drawing string on Image
        Graphics graphic = Graphics.FromImage(original_image);
        graphic.DrawString(sWaterMark, new Font("Verdana", fontsize, FontStyle.Bold), new SolidBrush(Color.FromArgb(80, 255, 255, 255)), x, y, drawFormat);

        original_image.Save(MapPath("~/" +"/" + FileUpload1.PostedFile.FileName));
        if (original_image != null) original_image.Dispose();
        if (graphic != null) graphic.Dispose();

        string image_name = FileUpload1.PostedFile.FileName;
  
  
        con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=D:\website\MapExtractor\App_Data\MapDB.mdf;Integrated Security=True;User Instance=True");

        con.Open();
        cmd = new SqlCommand("insert into Table1(name,image) values('"+TextBox3.Text+"','"+image_name+"')", con);

       // cmd.Parameters.AddWithValue("@name", TextBox3.Text);
        // int img = FileUpload1.PostedFile.ContentLength;

        //byte[] msdata = new byte[img];

        //FileUpload1.PostedFile.InputStream.Read(msdata, 0, img);

       // cmd.Parameters.AddWithValue("@image", bmp);
        cmd.ExecuteNonQuery();

        Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "Alert", "alert('Image Added')", true);
        con.Close();
           

  sir please check it and help me...