Сохранение рисунка в БД и извлечение в PictureBox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;
 
namespace ScreenshotCapturer
{
    public partial class Form1 : Form
    {
        private static Bitmap bmpScreenshot;
        private static Graphics gfxScreenshot;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void btnCapture_Click(object sender, EventArgs e)
        {
            // If the user has choosed a path where to save the screenshot
            if (saveScreenshot.ShowDialog() == DialogResult.OK)
            {
                // Hide the form so that it does not appear in the screenshot
                this.Hide();
                // Set the bitmap object to the size of the screen
                bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
                // Create a graphics object from the bitmap
                gfxScreenshot = Graphics.FromImage(bmpScreenshot);
                // Take the screenshot from the upper left corner to the right bottom corner
                gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
                // Save the screenshot to the specified path that the user has chosen
                bmpScreenshot.Save(saveScreenshot.FileName, ImageFormat.Png);
                // Show the form again
                this.Show();
            }
        }
    }
}

Byte[] blob = null;
FileStream fs = null;
const string sConn = "server=(local);Initial
Catalog=Northwind;UID=ctester;PWD=password";
try {
SqlConnection conn = new SqlConnection(sConn);
SqlCommand cmd = new SqlCommand("SELECT Picture FROM Categories WHERE
CategoryName='Builder'", conn);
cn.Open();
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
 
blob = new Byte[(sdr.GetBytes(0, 0, null, 0, int.MaxValue))];
sdr.GetBytes[0, 0, blob, 0, blob.Length);
sdr.Close();
conn.Close();
fs = new FileStream("c:\\Builder.doc", FileMode.Create, FileAccess.Write);
 
fs.Write(blob, 0, blob.Length);
fs.Close();
} catch (SqlException e){
Console.WriteLine("SQL Exception: " + e.Message);
} catch (Exception e) {
Console.WriteLine("Exception: "+ e.Message);
}

string database = "test.fdb";
 
CreateEmbeddedDb(database, "test.sql");
 
FbConnectionStringBuilder csb = new FbConnectionStringBuilder();
csb.ServerType = 1;
csb.Database = database;
 
using (FbConnection c = new FbConnection(csb.ToString()))
{
    c.Open();
            
    FbCommand cmdInsert = new FbCommand("INSERT INTO mytable(id, val) VALUES(@id, @val)", c);
    cmdInsert.Parameters.Add("@id", 1);
    cmdInsert.Parameters.Add("@val", new byte[] {1, 2, 3});
    cmdInsert.ExecuteNonQuery();
 
    FbCommand cmd = new FbCommand("SELECT val FROM mytable", c);
                
    using (FbDataReader r = cmd.ExecuteReader())
    {
        while (r.Read())
        {
            int size = 20;
            byte[] bytes = new byte[size];
            long count = r.GetBytes(0, 0, bytes, 0, size);
            for(int i = 0; i < count; i++)
                Console.WriteLine("Value: " + bytes[i]);
        }
    }
}