We Keep Coding

Blazor client side send an email

I included a contact form in a razor page, so an user can fill it with his email, a subject and a body. When he submit it, the email is send to my email adress.
My code looks like this example
But when i submit my form, i had this error
Operation is not supported on this platform.
It's not supported because i'm running it on the browser (client side).
I would like to know if someone as a turnaround for this case, without using a smtp server (since the user can access the credentials of the server) or
test#example.com
Thank you.
Regards, Samih.

This is not possible, because browsers have security restrictions which forbids sending E-Mails. This restrictions doesn't come from Blazor or ASP.NET Core. It won't work with JavaScript either. Or at least not with questionable hacks.
I won't recommend to use projects like smtp.js which are trying to work around those limitations: They're doing the only suiteable method by using a server-side API. But the problem here is, that you expose those credentials at least to smtp.js cause by generating a security token, they store your credentials on their servers so the API could fetch them when you call their Email.send() method from JS.
To realize this securely, you need some kind of API on the server side for sending those mails using a mailserver (mostly with SMTP). Since you say it runs on the browser, I'm assuming that you're using Blazor WebAssembly. So either create an API project which could be called using e.g. Ajax from your WASM project or switch to Blazor Server which allows you to run the code directly on the server, if this is suiteable for the use-case.
Important: Keep an eye on misuse!
Even with your own API using credentials stored secretly on your own server, it's important to prevent misuse. If there is an API that could send Mails to anyone with your account without any limitations, it will be only a matter of time until bots will abuse them to send spam - even when the credentials are not exposed!
This can harm your on many ways:
Spam or even malicious content in your name
Your mail account got taken down
Desired mails won't be send cause your mail is on every spam-list
...
For that reasons it should be in your interest to send mails only from your servers with proper limits on that API like allowing only whitelisting senders, rate limits and so on.

This blog post may be helpful to you: Blazor (Wasm) – How to Send Email from a PWA. It invokes the user's native mail application instead of relying on a server-based or API-based implementation.
Excerpted, "...for very basic email needs is to leverage the old-school technique of using “mailto:” anchor links combined with injecting Blazor’s IJSRuntime."
protected void SendLocalEmail(string toEmailAddress, string subject, string body)
{
JsRuntime.InvokeAsync<object>("blazorExtensions.SendLocalEmail",
new object[] { toEmailAddress, subject, body });
}
Then, in your wwwroot folder, you should have a corresponding .js file (i.e. GlobalFunctions.js) that contains the corresponding JavaScript SendLocalEmail() function
window.blazorExtensions = {
SendLocalEmail: function (mailto, subject, body) {
var link = document.createElement('a');
var uri = "mailto:" + mailto + "?";
if (!isEmpty(subject)) {
uri = uri + "subject=" + subject;
}
if (!isEmpty(body)) {
if (!isEmpty(subject)) { // We already appended one querystring parameter, add the '&' separator
uri = uri + "&"
}
uri = uri + "body=" + body;
}
uri = encodeURI(uri);
uri = uri.substring(0, 2000); // Avoid exceeding querystring limits.
console.log('Clicking SendLocalEmail link:', uri);
link.href = uri;
document.body.appendChild(link); // Needed for Firefox
link.click();
document.body.removeChild(link);
}
};
function isEmpty(str) {
return (!str || str.length === 0);
}
Finally, be sure you include a reference to your .js file in the index.html file (also in the wwwroot folder):
<script src="GlobalFunctions.js"></script>
I place the above script reference below this line:
<script>navigator.serviceWorker.register('service-worker.js');</script>

CS0103: The name 'test' doesn't exist in the actual context

I'm coding a mobile app who should save some infos in a private remote database.
Of course, I can't access public websites of my enterprise to implement a webservice. On the other hand, we have a mailbox with a permanently activated macro who is able to activate another macro when it receives an email with a predefined subject. So, potentially, that 'robot' can save infos I want it to save.
I had to think at different solutions, I choosed one, but I am less and less sure of my choice.
Anyway, my mobile app is developed with Cordova and Ionic Framework. I didn't want to implement a plugin to open my user's mail client, I wanted my mail to be sent automatically.
Finally, I found SendGrid, I thought I could implement it directly in my mobile app, but I didn't make it (If somebody dit it, could you tell me so ? It could delete some steps in my app)
So I reflected about put a third actor in my process. PHP appeared as the best : I'm used to it, and I know we can easily send an email while the SMTP is defined ... It's too bad I can't implement webservices in public websites of my enterprise ^^
Another solution appeared to me : to use Microsoft's Azure service. So i created an ASP.net app of which here is the only sample of code. That method sends correctly my email (the first thing I wanted to verify), but it's unable to recover my form's data.
I wanted to use Request.Form.Keys to see what does it recover before I treat my data, and it didn't recover anything so I didn't understand.
I finally created that test String to delete a doubt who was growing. I put a breakpoint on the next line, where my Datetime is instantiate, to see what was in my test ... and it doesn't exist.
Here is the error I can see with my breakpoint :
AzureSendgrid.Controllers.HomeController.SendMail() : test value is error CS0103: The name 'test' doesn't exist in the actual context
public void SendMail()
{
//System.Collections.Specialized.NameObjectCollectionBase.KeysCollection test = Request.Form.Keys;
String test = "test";
System.Diagnostics.Debug.Write(test);
DateTime now = DateTime.Now; // Here is a breakpoint
// Create the email object first, then add the properties.
SendGridMessage myMessage = new SendGridMessage();
myMessage.AddTo(emailTo);
myMessage.From = new MailAddress(emailFrom, "Appli Mobile");
myMessage.Subject = "Appli Mobile Testing SendGrid";
myMessage.Text = "Date-Heure d'envoi : " + now.Day + "/" +
now.Month + " " + now.Hour + ":" + now.Minute + ":" + now.Second;
//myMessage.AddAttachment
// Create a Web transport, using API Key
var transportWeb = new Web(api_key)
// Send the email.
//var t = transportWeb.DeliverAsync(myMessage);
}
That error is pretty clear, and I could have understand it if there was not juste one line between the initialization and use of my test variable.
If anyone can see anything to help me, it would be nice !
Sorry for potential errors in this message, I'm French.

How do I create a webhook in ASP.NET MVC?

I'm trying to create a simple webhook to receive a delivery receipt from Nexmo SMS service. The only documentation on their website was this.
During account set-up, you will be asked to supply Nexmo a CallBack URL for Delivery Receipt to which we will send a delivery receipt for each of your SMS submissions. This will confirm whether your message reached the recipient's handset. The request parameters are sent via a GET (default) to your Callback URL and Nexmo will be expecting response 200 OK response, or it will keep retrying until the Delivery Receipt expires (up to 72 hours).
I've been searching for ways to do this, and so far I have this method from an example I found online, although I'm not sure if this is correct. Anyways, this is being run on ASP.NET and on port 6563, so is this the port I'm supposed to be listening to? I downloaded an application called ngrok which should expose my local web server to the internet, so I ran the application and instructed it to listen onto port 6563, but no luck. I've been fiddling with it trying to find someway to post to this function.
[HttpPost]
public ActionResult CallbackURL()
{
System.IO.StreamReader reader = new System.IO.StreamReader(HttpContext.Request.InputStream);
string rawSendGridJSON = reader.ReadToEnd();
return new HttpStatusCodeResult(200);
}
Usually I can call the function directly to return the view just by visiting http://localhost:6563/Home/Index/CallbackURL
So I've inserted a breakpoint on the method signature, but it'll only get called if I remove the [HttpPost] from it. Any next steps that I should try?

First you have to remove the [HttpPost] bit because it clearly states that "parameters are sent via a GET".
Then you should also remove the return HttpStatusCodeResult(200) as it will return the 200 OK status code anyway if no error occures.
Then you should simply read the values from querystring or using model binding. Here is a sample:
public string CallbackURL()
{
string vals = "";
// get all the sent data
foreach (String key in Request.QueryString.AllKeys)
vals += key + ": " + Request.QueryString[key] + Environment.NewLine;
// send all received data to email or use other logging mechanism
// make sure you have the host correctly setup in web.config
SmtpClient smptClient = new SmtpClient();
MailMessage mailMessage = new MailMessage();
mailMessage.To.Add("...#...com");
mailMessage.From = new MailAddress("..#....com");
mailMessage.Subject = "callback received";
mailMessage.Body = "Received data: " + Environment.NewLine + vals;
mailMessage.IsBodyHtml = false;
smptClient.Send(mailMessage);
// TODO: process data (save to database?)
// disaplay the data (for degugging purposes only - to be removed)
return vals.Replace(Environment.NewLine, "<br />");
}

Before couple of weeks Asp.Net team has announced to support Web Hooks with Visual Studio.
Please have a look here for more detailed information:
https://neelbhatt40.wordpress.com/2015/10/14/webhooks-in-asp-net-a-visual-studio-extension/

Microsoft is working on ASP.NET WebHooks, a new addition to the ASP.NET family. It supports a lightweight HTTP pattern providing a simple pub/sub model for wiring together Web APIs and SaaS services.
See Introducing Microsoft ASP.NET WebHooks Preview

So the issue I was having wasn't with my webhook at all, it was actually with IIS Express. Apparently it blocks most traffic from foreign hosts so there is some tweaking you can do before tunneling anything to your server. If you follow these guides you should have a working server.
https://gist.github.com/nsbingham/9548754
https://www.twilio.com/blog/2014/03/configure-windows-for-local-webhook-testing-using-ngrok.html

How to put contact us page in windows application c# [duplicate]

I'm thinking of implementing "Report a bug/Suggestions" option to my game, however I am not quite sure how I could get that working. I do not have my own server or anything, so I can't just send the text that user has written to there.
The only way I came up with is that the client would write a message and I would send it to an email account where I could read them. However, I do not want that users would need to send the reports through their personal accounts. I am not quite sure how I could implement this and googling didn't bring up any good suggestions.
I haven't done a lot of network stuff, so I'd really appreciate it if you could explain ( possibly even in code ) the process step-by-step.
I am using C# and the game is being programmed for Windows Phone 7.

Yes, it is absolutely possible to do that. From a relatively low-level perspective, you need to:
Resolve the MX (mail-exchanger) server for the e-mail account you want to send to.
Open a socket to the MX server.
Send the appropriate SMTP commands to cause the e-mail message to be delivered to your recipient account. You essentially have the freedom to set the "from" address to be any arbitrary thing you want.
SMTP is a very simple/human-friendly protocol, so it's not a massive effort to do all of that by hand. At the same time, there are prebuilt libraries that will handle all of that for you (except possibly the resolution of the recipient's MX server).
Note that emails sent this way are more likely to be filtered out as spam (generally because the sender's IP/hostname is not going to match whatever domain you put on the outgoing e-mail address you decide to use).
Also note that since you can set the "from" address to anything, you have the option of asking the user if they want to provide their actual contact address, and if they do you can make that the "from" address so that you can actually get back in touch with them if necessary.

You don't need to use email at all. Consider using an error reporting service like sentry or airbrake.
These services have clients that you embed in your program; which automatically log your errors, including any debugging information/stacktrace; and notify you by email when your application reports a problem.
Usually you integrate the app's API into your own error handling mechanism. At the point of an error, the client will capture your debugging information, you can popup a modal asking user for information like "what were you doing when this error happened?", save that as part of your error response that is sent back to the service.
Since the app works over HTTP, you don't need any special ports to be open. It is easier and more helpful than having users send you emails with "it doesn't work!!", and you don't have to deal with email sending headaches.

I recently wrote an article on this: Sending email with C#
You basically have two choices, either you send it using an SMTP-client, this means that you have to have a SMTP-server and be able to connect to port 25 (if you're not using an external SMTP, then you have to manage that by yourself). Or you can use an external email provider, such as:
AlphaMail
SendGrid
Mandrill
If you're using AlphaMail you can send emails in the following way:
IEmailService emailService = new AlphaMailEmailService()
.SetServiceUrl("http://api.amail.io/v1/")
.SetApiToken("YOUR-ACCOUNT-API-TOKEN-HERE");
var person = new Person()
{
Id = 1234,
UserName = "jdoe78",
FirstName = "John",
LastName = "Doe",
DateOfBirth = 1978
};
var response = emailService.Queue(new EmailMessagePayload()
.SetProjectId(12345) // ID of AlphaMail project (determines options, template, etc)
.SetSender(new EmailContact("support#company.com", "from#example.com"))
.SetReceiver(new EmailContact("Joe E. Receiver", "to#example.org"))
.SetBodyObject(person) // Any serializable object
);
Another thing that differs from just building HTML and sending it with an SMTP-client is that with AlphaMail you have the ability to edit your emails outside your code directly in a GUI. You can also easily create highly dynamic templates using AlphaMail's templating language Comlang.
<html>
<body>
<b>Name:</b> <# payload.FirstName " " payload.LastName #><br>
<b>Date of Birth:</b> <# payload.DateOfBirth #><br>
<# if (payload.Id != null) { #>
Sign Up Free!
<# } else { #>
Sign In
<# } #>
</body>
</html>

So this is my thought, why don't you have the email sent to you...as you?
using System.Net;
using System.Net.Mail;
var fromAddress = new MailAddress("from#gmail.com", "From Name"); //Both the email addresses would be yours
var toAddress = new MailAddress("to#example.com", "To Name"); //Both the email addresses would be yours
const string fromPassword = "fromPassword";
const string subject = "There name or whatever";
const string body = "Errors ect....";
var smtp = new SmtpClient
{
Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
};
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = subject,
Body = body
})
{
smtp.Send(message);
}
code from here
All they would see would be the submit button so they wouldn't have all your personal username/password, also you should prolly set up a dummy account to have them sent to even if it just then forwards them to your real email account.

Another way to achieve this would be to host a WCF Service which takes in your Message and stores in db or /sends email. One downside of this is you'll need a web server to do this.

Try following code this might help you :
Dim objCDOMail
Set objCDOMail = Server.CreateObject("CDONTS.NewMail")
objCDOMail.From = "sender#domain.com"
objCDOMail.To = "receiver#domain.com"
objCDOMail.Subject = "Test Mail Script"
objCDOMail.BodyFormat = 0
objCDOMail.MailFormat = 0
objCDOMail.Body = "Testing Mail from Test Script"
objCDOMail.Importance = 1
objCDOMail.Send
Set objCDOMail = Nothing

C#: What is the best method to send support request via email?

I have a windows forms application that I am adding a request support form to, and would like the user to be able to input the values and hit a button. Once the button is pushed I can either:
Open a new mail message and auto populate the message. (Not sure how to do this)
Submit the request via a http form on my website. (I know how to do this)
Send an email directly from the code of the application. (I know how to do this)
What I want to know is what would be the best method to use? I think option 1 is the most transparent, and the user will see exactly what is being sent, but I am not sure how to ensure it works no matter what email client they use.
I see there being potential issues with option two, specifically a firewall possibly stopping the submission. But option 2 would allow me to supply them with a ticket number right then and there for their request.
Thanks for the help.

For Option 1, as suggested, use the mailto handler.
Format your string like so: string.Format("mailto:support#example.com?subject={0}&body={1}", subject, body). Don't forget to UrlEncode the subject and body values.
Then use System.Diagnostics.Process.Start() with your string.
This will launch the registered mail handler (Outlook, Windows Live Mail, Thunderbird, etc) on the system.

For option 1 : If the message body is short, then invoking the mailto handler from inside your code no longer requires that they be using outlook. It's kinda a cheap hack, but it's completely cross-platform for local mail clients. (If they're using something like gmail, you're still SOL, though)

Option 2) is the best to avoid enterprise firewall issues because the HTTP port may not be blocked.
Option 2) is the best for simple configuration. The only config key you will have is the service/page url. Then your SMTP configuration will stay on your webserver.
Now you will have to choose between using a webpage (if one already exists) or a webservice (which is best fitted for your feature).

For option (1) be prepared to deal with Outlook version problems. But this is not hard (again if we are talking about Outlook, last version)
//using Microsoft.Office.Interop.Outlook;
private void OutlookMail(string Subject, string Body)
{
ApplicationClass app = new ApplicationClass();
NameSpaceClass ns = (NameSpaceClass)app.GetNamespace("mapi");
ns.Logon("", "", true, true);
MailItem mi =
(MailItem)app.CreateItem(OlItemType.olMailItem);
mi.Subject = Subject;
int EOFPos = Body.IndexOf(char.Parse("\0"));
if (EOFPos != -1)
{
log.Error("EOF found in Mail body");
ErrorDialog ed = new ErrorDialog(TietoEnator.Common.ErrorDialog.ErrorDialog.Style.OK, "Export Error", "File could not be exported correctly, please inform responsible person", "", "EOF char detected in the body of email message.");
ed.ShowDialog();
Body=Body.Replace("\0", "");
}
mi.HTMLBody = "<html><head><META content='text/html; charset=CP1257' http-equiv=Content-Type></head><body><table>"+Body+"</table></body></html>";
mi.BodyFormat = OlBodyFormat.olFormatHTML;//.olFormatPlain;
mi.Display(0); // show it non - modally
ns.Logoff();
}
BTW for automatic support requests I plan to use in my current project "Microsoft Enterprise Logging Support Block" email sending functionality.