Response.TransmitFile is not opening the links directly from SharePoint Library c#

Question

Hi,
 I want to open a pdf file from a sharepoint library. I am using Response.TransmitFile to do that. But it throws me the error "'url' is not a valid virtual path". Is there anyway otherway to do this.
            Response.Clear();
            Response.ClearHeaders();            
            Response.ContentType = "application/pdf";
            Response.TransmitFile("URL to the library" + fileName);
            Response.Flush();
            Response.End();

Answer 1

try using this method. In a standard .NET application what your doing may work but SharePoint works different as all the files are stored in the database.
private void OpenDocument(SPListItem listItem)
SPFile file = listItem.File;
using (MemoryStream ms = new MemoryStream(file.OpenBinary()))
Response.Clear();
// Clear the content of the response
Response.ClearContent();
Response.ClearHeaders();
// Buffer response so that page is sent after processing is complete.
Response.BufferOutput = true;
// Add the file name and attachment, which will force the open/cance/save dialog to show, to the header
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
// Add the file size into the response header
Response.AddHeader("Content-Length", file.Length.ToString());
// Set the ContentType - octet stream helps handle all content types generically
Response.ContentType = "application/octet-stream";
ms.WriteTo(Response.OutputStream);
Response.Flush();
Response.Close();
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Hi, Thanks for the reply. I didn't tested this, but when I do I will let you know the feedback.
For me "Response.Redirect" worked for now as a I am saving the document into library and then opening it.