my Response.TransmitFile not working when the file size is more than 10 MB [Answered]RSS

• • Reply
  wibowowiwit

  Member

  53 Points

  101 Posts

  my Response.TransmitFile not working when the file size is more than 10 MB

  Jul 06, 2017 07:18 AM|wibowowiwit|LINK

  Hi guys,

  i have button download, the button download will transferring file into the browser.

  the file will not transferred when the file size is more than 10 Mb.

  this will never occurs if the file size is less than 10 Mb.

  please suggest me whats wrong with me ? or please suggest me if i shall config my IIS server ?

  this is my code : 

  Protected Sub button_download_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button_download.Click
              
  table = "TABLE"
              sql = "SELECT FILE_NAME FROM DOCUMENT WHERE ID_DOCUMENT = '" & id_document & "' ORDER BY FILE_NAME ASC"
              dataset = eclass.dataset(sql, table)
              Dim file_name = dataset.Tables(table).Rows(0)("FILE_NAME")
              Dim file_path = Request.MapPath("") & "\document\" + file_name
              Dim file As New FileInfo(file_path)
  
              If file.Exists Then
                  Response.ClearContent()
                  Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name)
                  Response.AddHeader("Content-Length", file.Length.ToString())
                  Response.ContentType = "text/plain"
                  Response.TransmitFile(file.FullName)
                  Response.[End]()
              End If
  
  end sub

  Thank & Regards.
  Wibowo Wiwit

• • Reply
  Cathy Zou

  Star

  8670 Points

  2882 Posts

  Re: my Response.TransmitFile not working when the file size is more than 10 MB

  Jul 07, 2017 02:47 AM|Cathy Zou|LINK

  Hi wibowowiwit

  The maxRequestLength indicates the maximum file upload size supported by ASP.NET, the maxAllowedContentLength specifies the maximum length of content in a request supported by IIS. Hence, we need to set both maxRequestLength and maxAllowedContentLength values to upload large files.

  So, you need to add the following code in web.config:

  <system.web>
        <customErrors mode="Off"></customErrors>
        <compilation debug="true" targetFramework="4.0" />
        <httpRuntime maxRequestLength="2000000000" executionTimeout="999999"/>
  </system.web>
  
  <system.webServer>
     <security>
         <requestFiltering>
                  <requestLimits maxAllowedContentLength="2000000000" />
         </requestFiltering>
     </security>
     <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

  Then use the code below:

  If File.Exists Then
  	Response.Clear()
  Response.ClearHeaders()
  Response.ClearContent()
  Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name)
  Response.AddHeader("Content-Length", file.Length.ToString())
  Response.ContentType = "text/plain"
  Response.Flush()
  Response.Buffer = false;
  Response.TransmitFile(file.FullName)
  Response.[End]()
  End If
  

  Related links:

  https://forums.iis.net/t/1169846.aspx

  https://stackoverflow.com/questions/18480556/downloading-zip-file-with-maximum-file-size-limit

  https://stackoverflow.com/questions/43804446/c-sharp-download-big-file-from-server-with-less-memory-consumption

  Best regards

  Cathy

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