Post to an external form from a controller in mvc5 - asp.net-mvc-5

Question

I have a form in a mvc5 view with a button. I need to process this form in the controller and add a few more field values which is picked up from the controller and then posted to an external url.
#using (Html.BeginForm())
{
#Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Deal</h4>
<hr />
#Html.ValidationSummary(true)
<div class="form-group">
#Html.LabelFor(model => model.First_Name, new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.TextBoxFor(model => model.First_Name, new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.First_Name)
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Last_Name, new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.TextBoxFor(model => model.Last_Name, new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.Last_Name)
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" class="btn btn-default" name="save" />
<input type="submit" value="Register Deal" class="btn btn-default" name="submit" />
</div>
</div>
Controller
public ActionResult Create([Bind(Include = "Id,Name,Company,Telephone,Fax,Email,Title,Status,OpportunityAmount,First_Name,Last_Name,City,State,Country,Zip")] Deal deal, String submit)
{
if (ModelState.IsValid)
{
// do some processing and submit to another external form
}
}
Any thoughts on how we can accomplish this ?
One use case would be
if an username is provided the user then i would need to query from database the first last name, age etc and submit it to registration form of another site

Answer 1

You can post using Web Request Method. E.g.
public void post()
{
string URL = "http://";
System.Net.WebRequest webRequest = System.Net.WebRequest.Create(URL);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
Stream reqStream = webRequest.GetRequestStream();
string postData = Request.QueryString; //you form data in get format
byte[] postArray = Encoding.ASCII.GetBytes(postData);
reqStream.Write(postArray, 0, postArray.Length);
reqStream.Close();
StreamReader sr = new StreamReader(webRequest.GetResponse().GetResponseStream());
string Result = sr.ReadToEnd();
}