When I click the button,the following method occurs but the OPEN / SAVE dialog doesnt appear
protected void ButtonOpenCustomerFile_Click(object sender, EventArgs e)
{
int notificationID = Convert.ToInt32(Request.QueryString["ID"]);
Guid fileName = AttachmentManager.GetFileNameByNotificationID(notificationID, "customer");
string fileNameString = fileName.ToString();//filename without extension
try
{
string Path = ConfigurationManager.AppSettings["UploadFilePath"].ToString();
FileStream OpenFile = File.Open(Path + "\\" + fileNameString ...
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