1. Enable classic ASP compatibility mode
AspUpload 3.0 is not a native ASP.NET component. It was
written specifically for classic ASP, and it uses many intrinsic
ASP objects such as Request. Therefore, you must enable
the classic ASP compatibility mode
for all pages using AspUpload by setting the aspCompat attribute of the @Page
directive to True:
<%@ Page aspCompat="True" other attributes%>
Failure to do so will result in the run-time error
There is no MTS object context
2. Place ASPUPLOADLib.dll under \bin directory of your app
Create a \bin subdirectory under your ASP.NET application and place
the wrapper assembly ASPUPLOADLib.dll in it. Alternatively, you can
place this file in the Global Assembly Cache.
The file ASPUPLOADLib.dll
is included in the download given below. You may also re-create this file using the command-line utility TLBIMP.
3. Use ASPUPLOADLib.IUploadManager type to declare Upload object
Declare and instantiate the main Upload Manager object as follows:
VBScript:
Dim objUpload As ASPUPLOADLib.IUploadManager
objUpload = New ASPUPLOADLib.UploadManager
C#:
ASPUPLOADLib.IUploadManager objUpload;
objUpload = new ASPUPLOADLib.UploadManager();
4. In C#, use Missing.Value for optional arguments
AspUpload's main "workhorse" Save method
takes 3 optional arguments. In many cases you will be using only
the first argument (path) or none at all (if saving to memory).
C# requires all three arguments to be specified. Use the expression
Missing.Value for arguments you do not wish to use:
objUpload.Save("c:\\upload", Missing.Value, Missing.Value);
You must import the namespace System.Reflection to use the Missing object:
<%@ Import Namespace="System.Reflection" %>
4. In C#, shortcuts won't work
A VBscript expression such as
txtName = Upload.Form("name")
must be fully expanded in C#, as follows:
txtName = objUpload.Form.Item("Name").Value;
5. In C#, use + instead of & to concatenate strings
A VBscript expression such as
txtLine = File.Name & "= " & File.Path & " (" & File.Size &" bytes)<BR>"
must be rewritten in C# as follows:
txtLine = objFile.Name + "= " + objFile.Path + " (" + objFile.Size + " bytes)<BR>";
6. Adjust maxRequestLength in web.config if necessary
The upload limit is set to 4MB (4096) by the httpRuntime section of the
machine.config file. You can change this setting to affect all applications
on your site, or you can override the settings in your application-specific
web.config as follows:
<system.web>
<httpRuntime maxRequestLength="15000" />
</system.web>
7. Review code samples
We have rewritten the code samples Form1.asp/UploadScript1.asp,
Form2.asp/UploadScript2.asp, and Form3.asp/UploadScript3.asp
in C#. Click on the following link to download
the .aspx versions of these code samples, along with
the wrapper assembly ASPUPLOADLib.dll:
simple_aspx.zip
Problems and Issues
It appears that the client-side progress bar functionality of AspUpload 3.0
no longer works under ASP.NET due to the way ASP.NET
handles large posts. We will continue to investigate this issue and
post our findings on this web site.
