怎么解决
SqlCommand com = new SqlCommand("select name from tb_17 where id="+DropDownList1.Text+"", con);SqlDataReader dr = com.ExecuteReader();
dr.Read();
MemoryStream ms = new MemoryStream((Byte[])dr["name"]);
Bitmap image = new Bitmap(ms);
string filepath = Server.MapPath("Files/");
DirectoryInfo dir = new DirectoryInfo(filepath);
FileInfo[] filecount = dir.GetFiles();
int i = filecount.Length;
imagename = filepath + ((i+1) + ".jpg");
// Label2.Text = (dir.GetFiles()).ToString();
image.Save(imagename);
dr.Close();
Image1.ImageUrl = "Files/"+(i+1)+".jpg";
// ImageButton1.ImageUrl = "Files/" + (i + 1) + ".jpg";
有哪位大哥帮我解下这段代码的意思