数据存取、转换问题，请各位指教
private void button2_Click(object sender, EventArgs e)
{
//找图片
//取得textbox中的数
string num = textBox1.Text;
string conn = ( "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\\test.mdb; ");
OleDbConnection myconn = new OleDbConnection(conn);

string query = "select * from graph where id= ' " + num + " ' ";
OleDbCommand mycommand = new OleDbCommand(query, myconn);
//取图片
try
{
myconn.Open();

}
catch
{
MessageBox.Show( " 不能打开数据联接! ");
}

OleDbDataReader dr = mycommand.ExecuteReader();
MessageBox.Show( "图片已找到！ ");
if (dr.Read())
{
byte[] mydata = (byte[])dr[ "photo "]; //缓冲区
int len = mydata.Length; //缓冲区长度

FileStream fs = new FileStream( "E:\\6.jpg ", FileMode.Create, FileAccess.Write);
fs.Write(mydata, 0, len);

fs.Close();

//显示
FileInfo fi = new FileInfo( "E:\\6.jpg ");
int imglen = (int)fi.Length;
byte[] imgdata = new byte[imglen];
Stream imgStream = fi.OpenRead();
int n = imgStream.Read(imgdata, 0, imglen);

Image myImage = Image.FromStream(imgStream);
imgStream.Close();
pictureBox1.Image = myImage;
pictureBox1.Refresh();

myconn.Close();

}
}
我要做的是从表里读一个2进制的记录，然后在picbox里显示出来，这个2进制数是我存的图片，但是数据取得时候还有转换的时候我感觉不太对
Image myImage = Image.FromStream(imgStream);
imgStream参数报错 说是无效的。请大家指教

[解决办法]
我这个也算沙发，
[解决办法]
对图片不熟,帮顶

[解决办法]
FileInfo fi = new FileInfo( "E:\\6.jpg ");
int imglen = (int)fi.Length;
byte[] imgdata = new byte[imglen];
Stream imgStream = fi.OpenRead();
int n = imgStream.Read(imgdata, 0, imglen);

Image myImage = Image.FromStream(imgStream);
imgStream.Close();
pictureBox1.Image = myImage;
pictureBox1.Refresh();

myconn.Close();
这几句是没有问题的，我试过了，关键看你从数据库中取出来没有？