将图片以流的形式保存到数据库(Image)以及从数据库中取出显示 
try 
            { 
                string imagepath = @"D:\backImage\black.jpg"; 
                FileStream fs = new FileStream(imagepath, FileMode.Open); 
                BinaryReader br = new BinaryReader(fs); 
                byte[] myimages = br.ReadBytes(Convert.ToInt32(fs.Length)); 
                //string conn_Str = @"server=.;database=pubs;user=sa;pwd=sasa"; 
                string conn_Str = @"Data Source=DF15D10F40A945C\SQLEXPRESS;Initial catalog =pubs;user=sa;pwd=sasa"; 
                using (SqlConnection sqlcon = new SqlConnection(conn_Str)) 
                { 
                    sqlcon.Open(); 
                    string insertsql = "insert into table1 values(1,@image)"; 
                    using (SqlCommand sqlcom = new SqlCommand(insertsql, sqlcon)) 
                    { 
                        SqlParameter sqlparameter = new SqlParameter("@image", SqlDbType.Image); 
                        sqlparameter.Value = myimages; 
                        sqlcom.Parameters.Add(sqlparameter); 
                        sqlcom.ExecuteNonQuery(); 
                    } 
                    string selectsql = "select * from table1"; 
                    using (SqlCommand sqlcom = new SqlCommand(selectsql, sqlcon)) 
                    { 
                        SqlDataReader sqldr = sqlcom.ExecuteReader(); 
                        sqldr.Read(); 
                        byte[] images = (byte[])sqldr["myimage"]; 
                        Stream stream = new MemoryStream(images); 
                        pictureBox2.Image = System.Drawing.Image.FromStream(stream); 
                    } 
                } 
            } 
            catch (Exception ex) 
            { 
                MessageBox.Show(ex.Message); 
            }