Hi,

Silverlight applies some storage quota to applications. You can ask the user to increase the quota as shown here:
http://blogs.silverlight.net/blogs/msnow/archive/2008/07/17/tip-of-the-day-20-ho...

For security reasons this must be done from a user initated event.

I hope that helps,
Stoyan

hi,
i wrote code like this:
private void mnPrint_Click(object sender, RadRoutedEventArgs e)
        {
          
            long spaceRequest = Convert.ToInt64(10485760);
            using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
            {               
                if (isf.IncreaseQuotaTo(spaceRequest))
                {
                    System.Windows.MessageBox.Show("Current Quota=" + isf.Quota.ToString() + " bytes");
                }
                using (IsolatedStorageFileStream os = new IsolatedStorageFileStream(this.DataContext.TaskBillMst.TaskBillCD + ".png", FileMode.Create, isf))
                {
                    this.diagram.SaveToPng(os);
                }

            }
        }

is there any mistakes?

hi,
Thank you for your help!
It didn't work because of telerik control,when i use normal button control ,it worked!
thank you very much!