Redirect av webbläsare efter form submit till C#-program

 <form name="form1" method="post" enctype="multipart/form-data" action="api/upload">
            <div class="row">
               <div class="col-sm-3">
                    <div class="form-group">
                        <label for="firstName">First Name</label>
                        <input type="text" class="form-control" name="FirstName" id="firstName" placeholder="First Name" data-required="yes">
                    </div>
                </div>
                <div class="col-sm-3">
                    <div class="form-group">
                        <label for="lastName">Last Name</label>
                        <input type="text" class="form-control" name="LastName" id="lastName" placeholder="Last Name" data-required="yes">
                    </div>
                </div>
                <div class="col-sm-6">
                    <!-- File Upload - Application -->
                    <label for="uploadApplication">Application (PDF)</label>
                    
                    <div class="fileinput fileinput-new input-group" id="uploadApplication" name="UploadApplication" data-provides="fileinput">
                        <div class="form-control" data-trigger="fileinput"><i class="glyphicon glyphicon-file fileinput-exists"></i> <span class="fileinput-filename"></span></div>
                        <span class="input-group-addon btn btn-default btn-file"><span class="fileinput-new">Select file</span><span class="fileinput-exists">Change</span><input type="file" name="..."></span>
                        <a href="#" class="input-group-addon btn btn-default fileinput-exists" data-dismiss="fileinput">Remove</a>
                    </div>
                </div>

            </div>
                
            <div class="row">
                <div class="col-sm-6">
                    <div class="form-group">
                        <label for="firstName">Agency Name</label>
                        <input type="text" class="form-control" name="AgencyName" id="agencyName" placeholder="Name of Agency" data-required="yes">
                    </div>
                </div>
                <div class="col-sm-6">
                    <!-- File Upload - E&O -->
                    <label for="uploadErrorOmissions">E&amp;O (PDF)</label>
                    <div class="fileinput fileinput-new input-group" id="uploadErrorOmissions" name="UploadErrorOmissions" data-provides="fileinput">
                        <div class="form-control" data-trigger="fileinput"><i class="glyphicon glyphicon-file fileinput-exists"></i> <span class="fileinput-filename"></span></div>
                        <span class="input-group-addon btn btn-default btn-file"><span class="fileinput-new">Select file</span><span class="fileinput-exists">Change</span><input type="file" name="..."></span>
                        <a href="#" class="input-group-addon btn btn-default fileinput-exists" data-dismiss="fileinput">Remove</a>
                    </div>
                </div>
            </div>

            <div class="row">
                <div class="col-sm-6">
                    <div class="form-group">
                        <label for="emailAddress">Email Address</label>
                        <input type="email" class="form-control" name="EmailAddress" id="emailAddress" placeholder="username@example.com">
                    </div>
                </div>
                <div class="col-sm-6">

                </div>
            </div>


            <div class="row">
                <div class="col-sm-12">
                    <button type="submit" class="btn btn-default btn-primary" id="btnSubmit">Submit</button>
                </div>
            </div>
        </form>

public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
{
    public CustomMultipartFormDataStreamProvider(string path) : base(path)
    { }

    public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers)
    {
        var name = !string.IsNullOrWhiteSpace(headers.ContentDisposition.FileName) ? headers.ContentDisposition.FileName : "NoName";
        //this is here because Chrome submits files in quotation marks which get treated as part of the filename and get escaped
        return name.Replace("\"",string.Empty); 
        }
}


public class UploadController : ApiController
{
    public struct EmailData
    {
        public string sendTo;
        public string sendFrom;
        public string subject;

    }

    static Dictionary<string, string> fieldList = new Dictionary<string, string>();
    static Dictionary<int, string> attachmentList = new Dictionary<int, string>();

    public async Task<HttpResponseMessage> PostFile()
    {
        // Check if the request contains multipart/form-data.
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
        }

        string root = HttpContext.Current.Server.MapPath("~/App_Data");
        var provider = new CustomMultipartFormDataStreamProvider(root);

        try
        {
            StringBuilder sb = new StringBuilder(); // Holds the response body

            // Read the form data and return an async task.
            await Request.Content.ReadAsMultipartAsync(provider);

            // This loops through the form data.
            foreach (var key in provider.FormData.AllKeys)
            {
                foreach (var val in provider.FormData.GetValues(key))
                {
                    fieldList.Add(key, val);
                }
            }

            // This loops through the uploaded files.
            int fileCount = 0;
            foreach (var file in provider.FileData)
            {
                fileCount++;
                FileInfo fileInfo = new FileInfo(file.LocalFileName);
                string foo = fileInfo.Name;
                attachmentList.Add(fileCount, fileInfo.FullName);
            }

            // Send email here
            EmailData emaildata = new EmailData();
            emaildata.sendFrom = "noreply@deep-south.com";
            if (fieldList.ContainsKey("SendTo"))
            {
                emaildata.sendTo = fieldList["SendTo"];
            }
            else
            {
                emaildata.sendTo = "khm@deep-south.com";
            }
            emaildata.subject = "Agency Submission (web)";
            SendEmail(emaildata,fieldList,attachmentList);

            // Send response back to browser
            return new HttpResponseMessage()
            {
                Content = new StringContent("Thank you.")
            };
            
        }
        catch (System.Exception e)
        {
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
        }
    }




    public static void SendEmail(EmailData emaildata, Dictionary<string, string> fields, Dictionary<int, string> attachments)
    {
        string smtpServer = "dsmail.deep-south.com";
        string bodyText = "A new agency submission has been received.\n";

        MailMessage message = new MailMessage(emaildata.sendFrom, emaildata.sendTo);
        message.Subject = emaildata.subject;
        foreach (KeyValuePair<string, string> pair in fields) {
            bodyText += "\n" + pair.Key + ": " + pair.Value;
        }
        bodyText += "\n\n";
        message.Body = bodyText;

        Attachment attachment;
        foreach (KeyValuePair<int, string> pair in attachments)
        {
            attachment = new Attachment(pair.Value);
            message.Attachments.Add(attachment);
            //bodyText += "\n" + pair.Key + ": " + pair.Value;
        }
        SmtpClient client = new SmtpClient(smtpServer);
        // Credentials are necessary if the server requires the client 
        // to authenticate before it will send e-mail on the client's behalf.
        client.UseDefaultCredentials = true;
        try
        {
            client.Send(message);
        }
        catch (System.Exception ex)
        {
            // Console.WriteLine("Exception caught in CreateTestMessage2(): {0}", ex.ToString());
        }
    }
}