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Post different binary files by curl, asp.net

The development environment is ASP.NET(C#) and I develop REST API.
And use curl command for calling the api in integration test.
What I want to know is the following things.
At one request,
it include two binary data files in an HTTP request body
and want to post it.
By the way, I know the method to post one binary data file.
The curl commnad is [--data -binary "#filePath"]
The mehod of ApiControlleris [public HttpResponseMessage Post(dyte[] data1)
The binary data of the file are included in variable data1.
It would be greatly appreciated if you could explain the details.

How to POST using httpwebrequest when I need to authenticate and in curl the authentication is done with "username:pass#website.com"?

In brief, in curl I can send post like this:
curl -X POST http://admin:admin#website.com/scriptText -F 'data here'
So in C# what header or method should I use to mimic this? Is this just basic auth? It doesn't seem to be since when i open the website it uses classic php like post/cookie method to keep track.
I have a method in C# which lets me log in and keeps me there with cookie but after this i can only use downloadstring() method to GET and not post a "forbidden" data?

Run a curl request in c#

I want to run a curl request given as
curl --data-binary #"/path/to/my.pdf" -H "Content-Type: application/pdf" -L "http://pdfx.cs.man.ac.uk"
This request simply sends a PDF file to http://pdfx.cs.man.ac.uk and in response this site return a XML file.
How it can be done in C#?

If I understand correctly, you want to reproduce form POST action in C#. One way is to use HttpClient from this package (.NET 4.0) or directly if working in .NET 4.5+.
A fully working example can be found here. Basically you have to:
you initialize the http client
initialize form data
post the data
wait for the response
You can also set the content type of posted content (in your case application/pdf), by following the provided answer from this question.

using cUrl from c#

I am trying to connect to clarify photo tagging service using c#. unfortunately they do not have a client api and I need to send cURL requests
The company website display the following code
curl "https://api.clarifai.com/v1/tag/" \
-X POST -F "encoded_data=#/Users/USER/my_image.jpeg" \
-H "Authorization: Bearer {access_token}"
I have tried different options with no luck
Is there a simple wrapper that I can use (that support the –x and –h options)
Or even better a code sample on how to approach this issue
Many thanks in advance

I believe, that Process.Start() suites your needs.

Watson dialog cURL conversation post request not passing form data

When making a post cURL request as below to try and continue a created conversation watson instead returns a new conversation.
curl -u "USERNAME":"PASSWORD" -X POST --form conversation_id=CONVOID --form client_id=CLIENTID --form input="What type of toppings do you have?" "https://gateway.watsonplatform.net/dialog/api/v1/dialogs/DIALOGID/conversation"
If i use the below cURL it works fine.
curl -u "USERNAME":"PASSWORD" --data "conversation_id=CONVOID&client_id=CLIENTID&input=What type of toppings do you have?" https://gateway.watsonplatform.net/dialog/api/v1/dialogs/DIALOGID/conversation
My issue being that now when trying to write a c# wrapper i'm running in to the same issue that POST requests fail to transmit their form data correctly.
What's going on ?
I either need a c# MVC equivalent to the "--data" formatting. ( currently using HttpClient.PostAsync) or to figure out what is exactly wrong with using post requests to continue conversations.
As far as i can tell i am replicating the post request in c# correctly so i don't think there are two issues. ( just one post request issue, not a cURL issue then a C# implementation issue.)
For what it's worth i have left the commands in the format i submitted them, only replacing sensitive values with BLOCKCAPITALS. If it looks like i've missed a quotation mark or curly bracket , it's because i have and may be the cause of the issue.

The service expects an application/x-www-form-urlencoded POST request
To do that in curl you need to use the -d parameter:
curl -u "USERNAME":"PASSWORD" -X POST
-d conversation_id=CONVOID
-d client_id=CLIENTID
-d input="What type of toppings do you have?"
"https://gateway.watsonplatform.net/dialog/api/v1/dialogs/DIALOGID/conversation"
-d, --data
(HTTP) Sends the specified data in a POST request to the HTTP server, in the same way that a browser does when a user has filled in an HTML form and presses the submit button. This will cause curl to pass the data to the server using the content-type application/x-www-form-urlencoded. Compare to -F, --form.
Curl documentation