Preventing the upload of duplicate files in ASP.NET (C#)

Hello,

I would like to be able to prevent users from overwriting a file on the destination folder but I do not understand how to alter the code-behind to achieve this. I think that the ImageUploader1_FileUploaded class, called by the OnFileUploaded property, is a good candidate as a function that could contain the duplicate file checking code. After reading the documentation, I think that the fileOverwrite property in the Nirvanix class would do the job, but I am not sure how to implement this function to perform the check. Any help on this issue would be very much appreciated, I have included a copy of the function that I have been working on.

Ross

protected void ImageUploader1_FileUploaded(object sender, Aurigma.ImageUploader.FileUploadEventArgs e)
{
string catalogPath = "C:/Documents and SettingsDesktop/Test_folder/";
Aurigma.ImageUploader.SourceFileInfo sourceFile = e.SourceFile;
//sourceFile.Save(Server.MapPath(catalogPath) + sourceFile.FileName);

Aurigma.ImageUploader.Nirvanix.NirvanixExtender ;

sourceFile.Save(catalogPath + sourceFile.FileName);
}

Edited by user Monday, September 13, 2010 1:29:20 AM(UTC)  | Reason: Not specified

Thank you very much for the help Dmitry - that solved the problem right away!