//獲取當前選擇的圖片
this.pictureBox1.Image = Image.FromStream(this.openFileDialog1.OpenFile());
//獲取當前圖片的路徑
string path = openFileDialog1.FileName.ToString();
//將制定路徑的圖片添加到FileStream類中    
FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
//通過FileStream對象實例化BinaryReader對象
BinaryReader br = new BinaryReader(fs);
//通過BinaryReader類對象的ReadBytes()方法將FileStream類對象轉化為二進制數(shù)組
byte[] imgBytesIn = br.ReadBytes(Convert.ToInt32(fs.Length));

//將圖片添加到數(shù)據庫中
string sql="insert into pic values(@pic)"; 
SqlParameter[] param = new SqlParameter[] { new SqlParameter("@pic", imgBytesIn) };
DBHelper.GetExecuteQuery(sql, param);

//將圖片從數(shù)據庫中取出
string sql="select * from pic where id=0";
SqlDataReader reader = DBHelper.GetExecuteReader(sql, null);
MemoryStream mss = null;
if (reader.Read())
{
  byte[] bytes = (byte[])reader["pic"];
  mss = new MemoryStream(bytes);
}
this.pictureBox2.Image = Image.FromStream(mss);