使用C#从数据库读取图像二进制流的代码

工作需要，要判断一个老的数据库中image存放的数据类型，写了一段代码，放在这里供大家参考。除数据库部分需要大家修改一下以外，其它全部调试正常。里面有意思的是省却了connection的close方法，而用了另一种方式取代，希望大家能注意一下。
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
using System.IO;

namespace image
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.ListBox listBox1;
private System.ComponentModel.Container components = null;

public Form1()
{

InitializeComponent();

}

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码

private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.listBox1 = new System.Windows.Forms.ListBox();
this.SuspendLayout();

this.button1.Location = new System.Drawing.Point(104, 216);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);

this.listBox1.ItemHeight = 12;
this.listBox1.Location = new System.Drawing.Point(0, 0);
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(200, 172);
this.listBox1.TabIndex = 1;

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Controls.Add(this.listBox1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Image";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void Form1_Load(object sender, System.EventArgs e)
{

}

private void button1_Click(object sender, System.EventArgs e)
{
string myConnectionString="workstation id=820SERVER;packet size=4096;integrated security=SSPI;data source=820SERVER;persist security info=False;initial catalog=images";
string mySelectQuery="SELECT * FROM VBADGE";
CreateMySqlDataReader(mySelectQuery,myConnectionString);
}

public void CreateMySqlDataReader(string mySelectQuery,string myConnectionString)
{
byte[] tmp;
SqlConnection myConnection = new SqlConnection(myConnectionString);
SqlCommand myCommand = new SqlCommand(mySelectQuery, myConnection);
myConnection.Open();
SqlDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
myReader.Read();
tmp=(byte[])myReader[0];
FileStream fs = new FileStream("tmp.tmp",FileMode.CreateNew);
BinaryWriter w = new BinaryWriter(fs);
w.Write(tmp);
w.Close();
myReader.Close();
}

}
}