private void button2_Click(object sender, EventArgs e)
        {
            sql_sel s1 = new sql_sel();

            s1.conn();
            string sql = "select image From dbo.pic where ID='" + textBox1.Text + "'";

            byte[] b = (byte[])s1.select(sql);
            File.WriteAllBytes(@"D:\read.gif", b);
            s1.close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string  teshuleixin = "@image";
            sql_sel s1          = new sql_sel();

            s1.conn();
            string sql = "insert into dbo.pic(image) values (" + teshuleixin + ")";

            s1.sql_insert(sql, byte1, teshuleixin);
            s1.close();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            sql_sel s1 = new sql_sel();

            s1.conn();
            string sql = "select R示意图 From dbo.B示意图 where R所属台账编号='" + textBox1.Text + "'";

            byte[]           b     = (byte[])s1.select(sql);
            MemoryStream     ms    = new MemoryStream(b);
            Image            image = System.Drawing.Image.FromStream(ms);
            img_width_change a     = new img_width_change();

            image             = a.change(image, pictureBox2.Width, pictureBox2.Height);
            pictureBox2.Image = image;
            s1.close();
        }