Upload Powerpoint File and Show file after upload

[sanam]

Hi
I upload powerpoint file using this code:

if (File1.PostedFile !=null) //Checking for valid file
		{		
			// Since the PostedFile.FileNameFileName gives the entire path we use Substring function to rip of the filename alone.
			string StrFileName = File1.PostedFile.FileName.Substring(File1.PostedFile.FileName.LastIndexOf("\\") + 1) ;
			string StrFileType = File1.PostedFile.ContentType ;
			int IntFileSize =File1.PostedFile.ContentLength;
			//Checking for the length of the file. If length is 0 then file is not uploaded.
			if (IntFileSize <=0)
				Response.Write(" <font color='Red' size='2'>Uploading of file " + StrFileName + " failed </font>");
			else
			{
				File1.PostedFile.SaveAs(Server.MapPath("./powerpoint/" + StrFileName));
				Response.Write( "<font color='green' size='2'>Your file " + StrFileName + " of type " + StrFileType + " and size " + IntFileSize.ToString() + " bytes was uploaded successfully</font>");
  }
		
		}

My problem is that I want to show all uploaded powerpoint file in specified folder in web server (Like attachment ). How I can do this.