数据库存取图片

private void button1_Click(object sender, EventArgs e) //窗体打开文件图片
{
openFileDialog1.Filter = "@.jpg|*.jpg|all files|*.*";
DialogResult dr = openFileDialog1.ShowDialog();
if (dr == DialogResult.OK)
{
FileStream fs = new FileStream(openFileDialog1.FileName,FileMode.Open,FileAccess.Read);
Image img = System.Drawing.Bitmap.FromStream(fs);
pictureBox1.Image = img;

}
}

private void button2_Click(object sender, EventArgs e)  //图片存入数据库
{
openFileDialog1.Filter = "@.jpg|*.jpg|@.gif|*.gif|All files|*.*";
DialogResult dr = openFileDialog1.ShowDialog();
if (dr == DialogResult.OK)
{
FileStream fs = new FileStream(openFileDialog1.FileName,FileMode.Open,FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
byte[] buffer = br.ReadBytes(int.Parse(fs.Length.ToString()));
SqlConnection conn = new SqlConnection("server=.;database=HQ0325;user=sa;pwd=123");
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into imgtable values(@buffer)";
cmd.Parameters.Add("@buffer",buffer);
conn.Open();
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
MessageBox.Show("保存成功");
}
}

private void button3_Click(object sender, EventArgs e)  //从数据库里获取图片并且在窗体里显示第一张
{
SqlConnection conn = new SqlConnection("server=.;database=HQ0325;user=sa;pwd=123");
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "select * from imgtable where code=1";
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Read();

byte[] buffer = (byte[])dr["imgs"];

cmd.Dispose();
conn.Close();
MemoryStream ms = new MemoryStream(buffer);
ms.Write(buffer, 0, buffer.Length);
Image img = Image.FromStream(ms);
pictureBox1.Image = img;
}
}