HttpContext null in WCF service?

here is my line of code and it throws me error on HttpConext.Current

string postData = "username=" + HttpContext.Current.Server.UrlEncode(USERNAME);


That's normal. There is no HTTP Context in a WCF web service. A WCF service might not even be hosted inside a web server. You could host in inside a console application. There's a trick that allows you to set the ASP.NET Compatibility Mode:

    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />    

but it is not something that I would recommend you doing.

I would do this instead:

var postData = "username=" + HttpUtility.UrlEncode(USERNAME);

And because I have a 7th sense about where you are going with this code (sending it as an HTTP request to a remote web server) let's get straight to the point:

using (var client = new WebClient())
    var values = new NameValueCollection
        { "username", USERNAME }
    var result = client.UploadValues("", values);

If you want to enable the HttpContext you can set the aspNetCompatibilityEnabled flag in web config.

 <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />    

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