The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE))

Question

I have a website in an IIS 7 shared hosting environment. It's running .NET 3.5. I have a download button to download a file from the server.

When I locally deploy this application to IIS 6, it runs fine. On the IIS 7 shared hosting server, the exception occurs.

The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE)) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
System.Runtime.InteropServices.COMException: The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE))
COMException (0x80070006): The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE))] [HttpException (0x80004005): An error occurred while communicating with the remote host. The error code is 0x80070006.]

How can this be solved?

string strRequest = Convert.ToString(Request.QueryString.Get("file"));
System.IO.FileInfo file = new System.IO.FileInfo(strRequest);
if (file.Exists)
{
    Response.Clear();
    Response.ContentType = ReturnExtension(System.IO.Path.GetExtension(file.Name));
    Response.AppendHeader("Content-Disposition", "attachment; filename=" + file.Name);
    Response.TransmitFile(strRequest);
    Response.End();
    HttpContext.Current.ApplicationInstance.CompleteRequest();
    //DownloadFile(file.FullName, file.Name);
}

Answer 1

Create a .bat file, put the following command and run the file. It will kill all existing webserver processes and should fix the problem. I had the same problem and it worked out for me. Thanks much

taskkill  /fi "imagename eq webdev.webserver40.exe"