protected void Button2_Click(object sender, EventArgs e)
  {
  string lastName = FileUpload1.FileName.Substring(FileUpload1.FileName.LastIndexOf(".") + 1);

  if (lastName.ToLower() == "jpg" || lastName.ToLower() == "bmp" || lastName.ToLower() == "gif")
  {
  int len = FileUpload1.PostedFile.ContentLength;
  Byte[] pictureData = new byte[len]; //将图片转换成二进制
  HttpPostedFile htp = FileUpload1.PostedFile;
  Stream srm = htp.InputStream;
  srm.Read(pictureData, 0, len);
  SqlConnection conn = new SqlConnection("Data Source=tiger;Initial Catalog=liuyan;Integrated Security=True");
  conn.Open();
  string sqlsel = "select * from tb_pic";
  SqlDataAdapter ada = new SqlDataAdapter(sqlsel, conn);
  DataSet ds = new DataSet();
  ada.Fill(ds);
  DataList1.DataSource = ds;
  DataList1.DataBind();
  SqlCommand comd = new SqlCommand("insert into tb_pic (username,name,pic) values ('" + TextBox4.Text + "','" + FileUpload1.FileName + "',@pictureData)", conn);
  comd.Parameters.Add("@pictureData", SqlDbType.Image);
  comd.Parameters["@pictureData"].Value = pictureData;
  comd.ExecuteNonQuery();
  DataList1.DataBind();
  conn.Close();

  Response.Write("<script>alert('添加成功！')location='tupian.aspx'</script>");
  }
  }
//csharp/821