How to clear previous search history in the immediate window

 type >cls in immediate window and Enter.

based on number get alphabets in c#

public string GetAlphabets(int number)

{

   string strAlpha = "";

   try

   {

     strAlpha = ((char)number).ToString();

   }

   catch (Exception e)

   {

     string message = e.Message;

     throw;

   }

   return strAlpha;

}

An item with the same key has already been added

"exceptionType": "System.ArgumentException",
  "message": "An item with the same key has already been added.",  "exceptionType": "System.ArgumentException",
  "message": "An item with the same key has already been added.",

Solution: In your model or .cs file same keys
Ex: public class Student
{
 public int Sid {set; get;};
 public string Name {get; set;}
 public sting Sid {set; get;} //Same Name - here we will get above exception. if we chnage to another name this issue will resolve.

}

stop confirm resubmission in page refresh time

<script>
if ( window.history.replaceState ) {
  window.history.replaceState( null, null, window.location.href );
}
</script>

Create hidden or private folder in windows

open notepad and paste below code and save .bat extension. password place changes your password. 

open your saved file. Here automatically create one folder like private. 

if you want to hide that folder open you're saved file it will open one command prompt type here "Y".

again if you want to open the private folder open you're saved file it will open one command prompt type here your password.

Quote: cls

@ECHO OFF

title Folder Private

if EXIST "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" goto UNLOCK

if NOT EXIST Private goto MDENTER PASSWORD TO OPEN

:CONFIRM

echo -----------------------------------------------------------

echo ================== Choulla Naresh ==================

echo -----------------------------------------------------------

echo Are you sure you want to lock the folder(Y/N)

echo Press (Y) for Yes and Press (N) for No.

echo -----------------------------------------------------------

set/p "cho=>"

if %cho%==Y goto LOCK

if %cho%==y goto LOCK

if %cho%==n goto END

if %cho%==N goto END

echo Invalid choice.

goto CONFIRM

:LOCK

ren Private "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"

attrib +h +s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"

echo Folder locked

goto End

:UNLOCK

echo -----------------------------------------------------------

echo ================== Choulla Naresh ==================

echo -----------------------------------------------------------

echo Enter password to unlock folder

set/p "pass=>"

if NOT %pass%== YOUR PASSWORD goto FAIL

attrib -h -s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"

ren "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" Private

echo Folder Unlocked successfully

goto End

:FAIL

echo Invalid password

goto end

:MDENTER PASSWORD TO OPEN

md Private

echo Private created successfully

goto End

:End

how to add project to GitHub repository

Open GitHub and create a repository
Next, execute a command in Gitbash
next, take update using GitHub repository URL
paste ur project and commit

Example : URL: https://github.com/C-Naresh/aspdotnet.git

Execute this command in GitBash

echo "# aspdotnet" >> README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/C-Naresh/aspdotnet.git
git push -u origin master

Now take update using this url https://github.com/C-Naresh/aspdotnet.git

Add your existing project inside folder and commit that's it... 

send confirmation email after registration and forgot password in Asp.Net MVC

find out EmailService : IIdentityMessageService

and add these two methods---

public async Task SendAsync(IdentityMessage message)
   {
      await configSendGridasync(message);
   }

   // Use NuGet to install SendGrid (Basic C# client lib)
   private async Task configSendGridasync(IdentityMessage message)
   {
      var myMessage = new SendGridMessage();
      myMessage.AddTo(message.Destination);
      myMessage.From = new System.Net.Mail.MailAddress(
                          "Joe@contoso.com", "Joe S.");
      myMessage.Subject = message.Subject;
      myMessage.Text = message.Body;
      myMessage.Html = message.Body;

      var credentials = new NetworkCredential(
                 ConfigurationManager.AppSettings["mailAccount"],
                 ConfigurationManager.AppSettings["mailPassword"]
                 );

      // Create a Web transport for sending email.
      var transportWeb = new Web(credentials);

      // Send the email.
      if (transportWeb != null)
      {
         await transportWeb.DeliverAsync(myMessage);
      }
      else
      {
         Trace.TraceError("Failed to create Web transport.");
         await Task.FromResult(0);
      }
   }
------------------------------
add keys in web.config

<add key="mailAccount" value="xyz" />
      <add key="mailPassword" value="password" />
-----------------------
find out public async Task<ActionResult> Register(RegisterViewModel model)
Add
await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);
After
string code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
            var callbackUrl = Url.Action("ConfirmEmail", "Account",
               new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
            await UserManager.SendEmailAsync(user.Id,
               "Confirm your account", "Please confirm your account by clicking <a href=\""
               + callbackUrl + "\">here</a>");
-------------------------
find out public async Task<ActionResult> Register(RegisterViewModel model)
comment await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);

and comment return RedirectToAction("Index", "Home");
add
ViewBag.Message = "Check your email and confirm your account, you must be confirmed "
                         + "before you can log in.";

         return View("Info");
         //return RedirectToAction("Index", "Home");
=================
create info page shared folder inside
----------
Add attribute in contact page
[Authorize]
public ActionResult Contact()

--------------
findout public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
add
if (!ModelState.IsValid)
    {
        return View(model);
    }
after
// Require the user to have a confirmed email before they can log on.
    var user = await UserManager.FindByNameAsync(model.Email);
    if (user != null)
    {
       if (!await UserManager.IsEmailConfirmedAsync(user.Id))
       {
          ViewBag.errorMessage = "You must have a confirmed email to log on.";
          return View("Error");
       }
    }
---------------
Add error.cshtml inside

@{
   if (String.IsNullOrEmpty(ViewBag.errorMessage))
   {
      <h2 class="text-danger">An error occurred while processing your request.</h2>
   }
   else
   {
      <h2 class="text-danger">@ViewBag.errorMessage</h2>
   }
}
------------
find out public async Task<ActionResult> ForgotPassword(ForgotPasswordViewModel model)
Add
if (user == null || !(await UserManager.IsEmailConfirmedAsync(user.Id)))
        {
            // Don't reveal that the user does not exist or is not confirmed
            return View("ForgotPasswordConfirmation");
        }
after
string code = await UserManager.GeneratePasswordResetTokenAsync(user.Id);
        var callbackUrl = Url.Action("ResetPassword", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
        await UserManager.SendEmailAsync(user.Id, "Reset Password", "Please reset your password by clicking <a href=\"" + callbackUrl + "\">here</a>");
        return RedirectToAction("ForgotPasswordConfirmation", "Account");

-------------------
uncomment Login.cshtml
inside
forget password link
-------
Add method
private async Task<string> SendEmailConfirmationTokenAsync(string userID, string subject)
{
   string code = await UserManager.GenerateEmailConfirmationTokenAsync(userID);
   var callbackUrl = Url.Action("ConfirmEmail", "Account",
      new { userId = userID, code = code }, protocol: Request.Url.Scheme);
   await UserManager.SendEmailAsync(userID, subject,
      "Please confirm your account by clicking <a href=\"" + callbackUrl + "\">here</a>");

   return callbackUrl;
}

How to check which version of .NET Framework I have installed in Command prompt

Goto To run and enter this path and "%windir%\Microsoft.NET\FrameWork" and enter 

next, find out latest version like "v4.0.30319" and open this folder

copy location and run cmd in administrator mode

Cd C:\WINDOWS\Microsoft.NET\FrameWork\v4.0.30319 press enter 

next, execute this command ".\MSBuild.exe -version" and enter that's it njoy... 

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required.

https://www.google.com/settings/security/lesssecureapps

Allow less secure apps: OFF to On 

'Y' already has a dependency defined for 'Z' in Nuget

This has been solved by installing the latest NuGet package manager

https://visualstudiogallery.msdn.microsoft.com/4ec1526c-4a8c-4a84-b702-b21a8f5293ca

Don't forget to re-launch or (close and open) Visual Studio.