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private void button1_Click(object sender, EventArgs e)
  {
  SqlConnection conn = new SqlConnection("server=.;database=test;uid=sa;pwd=sa");
  conn.Open();
  string sql = "insert into image values (@i)";
  SqlCommand cmd = new SqlCommand(sql, conn);
  byte[] ib = new Byte[60000];
  FileStream fs = new FileStream(@"D:\ͼƬ.jpg", FileMode.Open, FileAccess.Read);
  fs.Read(ib, 0, 60000);
  cmd.Parameters.Add("@i", SqlDbType.Image, (int)fs.Length);
  cmd.Parameters["@i"].Value = ib;
  cmd.ExecuteNonQuery();
  conn.Close();
  }

  private void button2_Click(object sender, EventArgs e)
  {
  SqlConnection conn = new SqlConnection("server=.;database=test;uid=sa;pwd=sa");
  conn.Open();
  string sql = "select * from image where id = 4";
  SqlCommand com=new SqlCommand (sql,conn);


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