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NotSupportedException: Cannot serialize interface C# Web Service [closed]

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I'm using for the first time Web Services, and when I try to consume it, I have this error:
NotSupportedException: Cannot serialize interface
I tried changing the configuration names or adding [XmlSerialize] but is not working...
What should I do to avoid this?
BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecurityMode.TransportCredentialOnly);
EndpointAddress endpoint =
new EndpointAddress("myendpoint")
client.ClientCredentials.UserName.UserName = _userName;
client.ClientCredentials.UserName.Password = _password;
SoapClient client = new SoapClient(binding, endpoint);
using (new OperationContextScope(client.InnerChannel)) --> here I have the problem
{
//My code
}

Why does creating contact forms require a password? [closed]

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So Im looking at having a contact form on my website where a person can type a message and send it, with the mesage going to my inbox.
But every time I see them online Ill see this:
System.Net.NetworkCredential("yourEmail#gmail.com", "YourPassword");
Why do I need to provide my password? When you send someone a regular email, you dont need THEIR password.
I also have security concerns. Ok, it's in a .cs file, but still, I dont like seeing my password in plain text there.
Also, what about if its for a big company? Does ebay have their password in plain text? It's something I doubt. How do other people do it?

You absolutely don't want the users password.
But for your contact form to be able to send a mail it needs to be send by a valid email client. Say for example you want to use the gmail server for your mail, you need to provide your credentials for it.
As for the second part of your question, please don't store these plain text in code. You can easily acces those from app.config / web.config
(for example see: Embed credentials for webclient in C# Console Application app.config?)

This is because you have your own SMTP relay and your own credentials.
So when setting up the mailer on your side, you need to specify a reply to email address.
Below is a working example of how do it
var m = new MailMessage { Subject = txtSubject.Text, IsBodyHtml = true, Body = emailOpeningLine + txtMessage.Text };
try
{
m.To.Add(new MailAddress("to");
m.From = new MailAddress("senders email address");
m.ReplyToList.Add("senders email address");
foreach (var attachment in Attactments)
{
m.Attachments.Add(new Attachment(attachment));
}
client.Send(m);
m.To.Clear();
m.Attachments.Clear();
}
catch (SmtpException esException)
{
}
catch (Exception ex)
{
}
Re your other questions, you can keep the passwords in a database, but remember to encrypt them.

C# asp.net Get Ipv4 ip address of a client [duplicate]

This question already has answers here:
How to get a user's client IP address in ASP.NET?
(21 answers)
Closed 7 years ago.
My below code is getting ivp6 ip address am not sure how to get ipv4 in the same manner.
string ipAddress = "";
if (Dns.GetHostAddresses(Dns.GetHostName()).Length > 0)
{
ipAddress = Dns.GetHostAddresses(Dns.GetHostName())[0].ToString();
}

This code:
Dns.GetHostAddresses(Dns.GetHostName())
Will return an array of all IP addresses assigned to the local machine. When you assign to the ipAddress variable, you are using "[0]", which only takes the first IP address in the list.
Look at the entire array and you might find that you are indeed getting the IPv4 addresses too.

Connect to Stack Overflow API [closed]

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Closed 8 years ago.
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I am trying to connect to the Stack Overflow API as one of my first api calls, but I am struggling.
Can someone tell me why this code does not return a success code?
using (var handler = new HttpClientHandler())
using (var client = new HttpClient(handler))
{
client.BaseAddress = new Uri("https://api.stackexchange.com/");
var response = await client.GetAsync("questions");
if (response.IsSuccessStatusCode)
{
}
else
{
Console.WriteLine(response.ToString());
}
}

The response tells you site is required. Hit https://api.stackexchange.com/questions?site=stackoverflow instead.

You're getting back
{"error_id":400,"error_message":"site is required","error_name":"bad_parameter"}
If you read the error and documentation, it needs to know which StackExchange site you want. Try:
https://api.stackexchange.com/questions?site=stackoverflow

how to use mailing system in C# [closed]

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Closed 9 years ago.
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i want to have an email system , when user done an action after that someone recieve an email in C#
so now how I can do that ??

You could use the .Net SmtpClient class as follows:
using System.Net.Mail;
// the e-mail details
String from = "me#server.com";
String to = "someone#server.com";;
// build up the message
MailMessage message = new MailMessage(from, to);
message.Subject = "My Title";
message.Body += "This is the biody of my message";
// create a server pointing to your mail server
String server = "mail.server.com";
// create a client
SmtpClient client = new SmtpClient(server);
client.Credentials = CredentialCache.DefaultNetworkCredentials;
// send the message
client.Send(message);

To send an email in .NET you could use the SmptClient class.