The simple way to add Google login (OpenID) into ASP.NET MVC project

Step 1: Add DotnetOpenAuth lib from http://www.dotnetopenauth.net/ into ASP.NET MVC project reference
Step 2: Add following section into web.config file:

Step 3: Add an action for Authentication

protected static OpenIdRelyingParty openid = new OpenIdRelyingParty();
        [ValidateInput(false)]
        public ActionResult LoginByGoogle(string returnUrl)
        {
            var response = openid.GetResponse();
            if (response == null)
            {
                string openidUrl = "https://www.google.com/accounts/o8/id";
                Identifier id;
                if (Identifier.TryParse(openidUrl, out id))
                {
                    try
                    {
                        var req = openid.CreateRequest(openidUrl);
                        var fetch = new FetchRequest();
                        fetch.Attributes.Add(new AttributeRequest(WellKnownAttributes.Contact.Email, true));
                        req.AddExtension(fetch);
                        return req.RedirectingResponse.AsActionResult();
                    }
                    catch (ProtocolException ex)
                    {
                        ViewData["Message"] = ex.Message;
                        return View("LogOn");
                    }
                }

                ViewData["Message"] = "Invalid identifier";
                return View("LogOn");
            }
            switch (response.Status)
            {
                case AuthenticationStatus.Authenticated:
                    Session["FriendlyIdentifier"] = response.ClaimedIdentifier;
                    var sreg = response.GetExtension();
                    if (sreg != null)
                    {
                        var model = new RegisterModel()
                        {
                            Email = sreg.Email,
                        };
                        FormsAuthentication.SetAuthCookie(model.Email, true /* createPersistentCookie */);
                        return RedirectToAction("Home", "Index");
                    }
                    return View("LogOn");
                case AuthenticationStatus.Canceled:
                    ViewData["Message"] = "Canceled at provider";
                    return View("LogOn");
                case AuthenticationStatus.Failed:
                    ViewData["Message"] = response.Exception.Message;
                    return View("LogOn");
            }

            return new EmptyResult();
        }

Step 4: Add a link to point to this Action
@Html.ActionLink("Log in using Google", "LoginByGoogle")

PHP or ASP.NET: Did I Do The Right Thing?

http://www.wekeroad.com/2014/02/18/i-had-a-choice-php-or-net/

How to add log4net into ASP.NET project?

1. Download dll file from
http://logging.apache.org/log4net/download_log4net.cgi
2.Add following log4net.config file into project

3. In Global.asax

protected void Application_Start()
        {
            string l4net = Server.MapPath("~/log4net.config");
            log4net.Config.XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(l4net));
        }

4. Add write permission setting for log file folder
IIS manager -> Application pool -> Get name of application pool
File explorer -> folder property -> Security -> Add IIS AppPool\\app pool name into log file folder write/read permission.

http://blogs.iis.net/webdevelopertips/archive/2009/10/02/tip-98-did-you-know-the-default-application-pool-identity-in-iis-7
-5-windows-7-changed-from-networkservice-to-apppoolidentity.aspx

5. Usage:

ILog log = LogManager.GetLogger(typeof(this));
log.Info("message");

References:
Apache log4net™ Manual - Configuration
http://logging.apache.org/log4net/release/manual/configuration.html
http://ruchirac.blogspot.ca/2012/10/configure-log4net-with-aspnet-logging.html

How to get application root path in ASP.MVC 3 and 3+

string rootpath = HttpContext.Current.Request.ApplicationPath;
Or
string rootpath = Url.Content("~"),

How to solve problem, Only WS-ReliableMessaging messages are processed by this endpoint

Remove reliableSession binding from WCF server side setting.

Or Add reliableSession binding setting into client side as well.

How to enable WCF tracing to debug weird problem?

Got a weird WCF timeout exception
The socket connection was aborted. This could be caused by an error processing your message or a receive timeout being exceeded by the remote host, or an underlying network resource issue
The read operation failed, see inner exception.

After tried all of settings related to timeout, decided to enable WCF tracing to see what exactly happened on server side.

Found one serialization exception in the log, solved the problem.


Put following setting to enable WCF tracing:

http://msdn.microsoft.com/en-us/library/ms733025.aspx

How to format phone number in C#

String.Format("{0:###-###-####}", double.Parse("1234567890"))

How to valid phone by Knockout Validation plugin ?

Add Knockout Validation reference into project from
https://github.com/ericmbarnard/Knockout-Validation

    self.Telephone = ko.observable("").extend({
        required: true,
        pattern: {
            message: '*Invalid Phone Number. (Format: 999-999-9999)',
            params: /\d{3}-\d{3}-\d{4}/
        }
    });

How to cast base class into derived class by JavaScriptSerializer

                BaseClass b = new BaseClass(){};
                System.Web.Script.Serialization.JavaScriptSerializer ser = new System.Web.Script.Serialization.JavaScriptSerializer();
                var json = ser.Serialize(b);
                DerivedClass d = ser.Deserialize(json);

How many data binding context variables in Knockout?

http://knockoutjs.com/documentation/binding-context.html
$parent
$parents
$root
$data
$index (only available within foreach bindings)
$parentContext
$context
$element

How to bind array of string in Knockout?

$data
Example

5 Javascript debugging tips you’ll start using today

http://berzniz.com/post/78260747646/5-javascript-debugging-tips-youll-start-using-today

10 ways to be a faster code reviewer

http://blog.codacy.com/top-10-faster-code-reviews/

How to trigger validation on Data annotation attributes in C#?

Name space: System.ComponentModel.DataAnnotations

var validationResults = new List();
            var myObject = new LoginViewModel();
            var validateContext = new ValidationContext(myObject, null, null);
            var isValid =  Validator.TryValidateObject(myObject, validateContext,validationResults);

    public class LoginViewModel
    {
        [Required]
        [Display(Name = "User name")]
        public string UserName { get; set; }

        [Required]
        [DataType(DataType.Password)]
        [Display(Name = "Password")]
        public string Password { get; set; }

        [Display(Name = "Remember me?")]
        public bool RememberMe { get; set; }
    }

How to get validation errors in ASP.NET MVC model?

foreach (ModelState state in ViewData.ModelState.Values) {
    foreach (ModelError error in state.Errors) {
        var ex = error;
    }
}

How to solve Json deserilization problem, Type 'System.String' is not supported for deserialization of an array?

The property is set to string type, but the json data is return a string array..