wait() in asp.net (showing uploaded image) - asp.net

Question

I want to force my program to wait some moments after doing something, and then do somwthing else, in asp.net and silverlight.
(In Detail, I want to upload an image by silverlight program, and then show it in my page by an Image control. But when I upload images which their size is about 6KB or upper, the image doesn't show, however it has been uplaoded successfully. I think that waiting some moments may solve the problem)
May anyone guide me?
thank you

Answer 1

I use the code in this page
This is the code in MyPage.Xaml:
private void UploadBtn_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.Multiselect = false;
dlg.Filter = UPLOAD_DIALOG_FILTER;
if ((bool)dlg.ShowDialog())
{
progressBar.Visibility = Visibility.Visible;
progressBar.Value = 0;
_fileName = dlg.File.Name;
UploadFile(_fileName, dlg.File.OpenRead());
}
else
{
//user clicked cancel
}
}
private void UploadFile(string fileName, Stream data)
{
// Just kept here
progressBar.Maximum = data.Length;
UriBuilder ub = new UriBuilder("http://mysite.com/receiver.ashx");
ub.Query = string.Format("fileName={0}", fileName);
WebClient c = new WebClient();
c.OpenWriteCompleted += (sender, e) =>
{
PushData(data, e.Result);
e.Result.Close();
data.Close();
};
try
{
c.OpenWriteAsync(ub.Uri);
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
}
private void PushData(Stream input, Stream output)
{
byte[] buffer = new byte[input.Length];
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) != 0)
{
output.Write(buffer, 0, buffer.Length);
}
progressBar.Value += input.Length;
if (progressBar.Value >= progressBar.Maximum)
{
progressBar.Visibility = System.Windows.Visibility.Collapsed;
loadImage();
}
}
private void loadImage()
{
Uri ur = new Uri("http://mysite.com/upload/" + _fileName);
img1.Source = new BitmapImage(ur);
}
And this is receiver.ashx:
public void ProcessRequest(HttpContext context)
{
string filename = context.Request.QueryString["filename"].ToString(); using (FileStream fs = File.Create(context.Server.MapPath("~/upload/" + filename)))
{
SaveFile(context.Request.InputStream, fs);
}
}
private void SaveFile(Stream stream, FileStream fs)
{
byte[] buffer = new byte[stream.Length];
int bytesRead;
while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
{
fs.Write(buffer, 0, bytesRead);
}
}