Upload and download a file in the appn, asp.net

write this in a asp botton after browse the file using file upload button:

if (FileUpload1.HasFile)
{
string strFileExtension = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName);

if (strFileExtension.ToUpper() == ".DOC" || strFileExtension.ToUpper() == ".DOCX" || strFileExtension.ToUpper() == ".TXT" || strFileExtension.ToUpper() == ".XLS" || strFileExtension.ToUpper() == ".XLSX" || strFileExtension.ToUpper() == ".PDF" || strFileExtension.ToUpper() == ".JPG" || strFileExtension.ToUpper() == ".JPEG" || strFileExtension.ToUpper() == ".PNG")
{
string fileNameWithoutExtension = System.IO.Path.GetFileNameWithoutExtension(FileUpload1.FileName);
string fn = fileNameWithoutExtension + "" + txtMRNNO.Text + "_" + DateTime.Now.ToString().Replace("/", string.Empty).Replace(" ", string.Empty).Replace(":", string.Empty) + "" + strFileExtension;
string SaveLocation = Server.MapPath("~/MedicalRecords/Uploads/") + fn;
FileUpload1.PostedFile.SaveAs(SaveLocation);
FileUpload1.Visible = false;
Label1.Text = fn;
imgAttachmentsSave.Focus();
btnUpload.Visible = false;
}




for dowloading:


if (e.CommandName == "Download")
{
int Count = Convert.ToInt32(e.CommandArgument);
//GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
Label lblFileName = new Label();
lblFileName = gvAttachments.Rows[Count].FindControl("lblFileName") as Label;

string filename = Server.MapPath("Uploads/" + "" + Convert.ToString(lblFileName.Text));
FileInfo fileInfo = new FileInfo(filename);
if (fileInfo.Exists)
{
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment;filename=" + fileInfo.Name);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.Flush();
Response.WriteFile(fileInfo.FullName);
Response.End();
}
}