C# download and send file

HttpClient , that I recommend you use instead. Below you can see a exemple of how the Webclient works, on your case you are getting "useless error" because you are on a async method. I would suggest to use the normal method like below to debug and get the correct exception. Also, I'll let this link for your reference. So, When I run the program and enter 2 numbers e.

But, when I run program and type 2,4 and 4,5 the result is 6,9? Then line 13 instantiates a MultipartFormDataContent object, which is the request content sent to the server side app.

The key can be different when multiple files are included in a form. The values can only be represented as strings, and the server side app will have to parse them into correct data types. Line 21 sends the HTTP post request when the request content is ready. Lines 23 and 24 receive the HTTP response for later use. In order to download a file, we make an HTTP Get request, then read the response content into a memory stream which can be copied to a physical file.

If you are interested, you might want to read my other articles: File Upload via Swagger , Upload Files with Angular and. Again, the full solution for this article is in my GitHub repository. I hope you have learned something new. Thanks for reading. HttpWebRequest class.

The following code segment prepares an instance of the System. HttpWebRequest class to download my website logo. Sometimes, there is a need for the client to supply some information to the web server in order to download a file.

Next, make sure your application startup Startup. Hopefully this helps anyone who struggled like me! Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 10 years, 7 months ago. Active 1 year, 7 months ago. Viewed k times. These are the examples of what I've tried so far. Data, document. ContentType, document. Data , document. Add HeaderNames.

ContentDisposition, cd. ToString ; return File document. Nick Albrecht. Nick Albrecht Nick Albrecht Add a comment. Active Oldest Votes. Oskar Berggren 5, 1 1 gold badge 15 15 silver badges 35 35 bronze badges. Darin Dimitrov Darin Dimitrov k gold badges silver badges bronze badges.

If I recall correctly, it can be un-quoted so long as the filename has no spaces I ran mine through HttpUtility. UrlEncode to achieve this. It will work in IE, but Chrome will report a duplicate header and refuse to present the image. Using MVC 5, there is no need for the content-disposition header anymore, as it is already part of the response header. Show 8 more comments.

The document variable was just a class POCO representing the information about the document you wanted to return. That was asked on the answer accepted as well. It could come from an ORM, from a manually built SQL query, from the file system as yours pulls information from , or some other data store.

Thanks for contributing an example using just the file system though. Thanks, Saved my day : — Dipesh. An alternative to AppDomain. BaseDirectory is System. Do i have to use javascript in order to start the download? Nothing is happening, no download or anything when i run through and debug my code. Show 2 more comments.