Errore server nell'applicazione '/'.

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Riga 15:         context.Response.Clear()
Riga 16:         context.Response.AddHeader("Content-Disposition", "attachment; filename=" + File.Name)
Riga 17:         context.Response.AddHeader("Content-Length", File.Length.ToString())
Riga 18:         context.Response.ContentType = "application/...."
Riga 19:         context.Response.WriteFile(File.FullName)

[FileNotFoundException: Impossibile trovare il file 'C:\Domini\www.torredeironchi.com\App_Data\gare/df549bcf-60a8-4712-8cbe-bd6158b71c6d/1ef74399-79e9-4fb7-9268-c370f8654535.pdf'.]
   System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +305
   System.IO.FileInfo.get_Length() +7622836
   getDoc.ProcessRequest(HttpContext context) in C:\Domini\www.torredeironchi.com\admin\class\getDoc.ashx:17
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75