C#+Mysql 图片数据存储

//把文件转成二进制流出入数据库
private void button2_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream(textBox1.Text, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
Byte[] byData = br.ReadBytes((int)fs.Length);
fs.Close();
string conn = "server=.;database=testDB;Uid=sa;Pwd=sa ";
SqlConnection myconn = new SqlConnection(conn);
myconn.Open();
string str = "insert into pro_table (pro_name,pro_file) values('测试文件',@file)";
SqlCommand mycomm = new SqlCommand(str, myconn);
mycomm.Parameters.Add("@file", SqlDbType.Binary, byData.Length);
mycomm.Parameters["@file"].Value = byData;
mycomm.ExecuteNonQuery();
myconn.Close();
}

//从数据库中把二进制流读出写入还原成文件
private void button4_Click(object sender, EventArgs e)
{
string conn = "server=.;database=testDB;Uid=sa;Pwd=sa ";
string str = "select pro_file from pro_table where pro_name='测试文件' ";
SqlConnection myconn = new SqlConnection(conn);
SqlDataAdapter sda = new SqlDataAdapter(str, conn);
DataSet myds = new DataSet();
myconn.Open();
sda.Fill(myds);
myconn.Close();
Byte[] Files = (Byte[])myds.Tables[0].Rows[0]["pro_file"];
BinaryWriter bw = new BinaryWriter(File.Open("D:\2.rdlc",FileMode.OpenOrCreate));
bw.Write(Files);
bw.Close();
}