.NET Identity Email/Username change

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Update Dec 2017 Some good points have been raised in comments:

  • Better have a separate field for new email while it is getting confirmed – in cases when user have entered incorrect email. Wait till the new email is confirmed, then make it the primary email. See very detailed answer from Chris_ below.
  • Also there could be a case when account with that email already exist – make sure you check for that too, otherwise there can be trouble.

This is a very basic solution that does not cover all possible combinations, so use your judgment and make sure you read through the comments – very good points have been raised there.

// get user object from the storage
var user = await userManager.FindByIdAsync(userId);

// change username and email
user.Username = "NewUsername";
user.Email = "New@email.com";

// Persiste the changes
await userManager.UpdateAsync(user);

// generage email confirmation code
var emailConfirmationCode = await userManager.GenerateEmailConfirmationTokenAsync(user.Id);

// generate url for page where you can confirm the email
var callbackurl= "http://example.com/ConfirmEmail";

// append userId and confirmation code as parameters to the url
callbackurl += String.Format("?userId={0}&code={1}", user.Id, HttpUtility.UrlEncode(emailConfirmationCode));

var htmlContent = String.Format(
        @"Thank you for updating your email. Please confirm the email by clicking this link: 
        <br><a href="https://stackoverflow.com/questions/25570025/{0}">Confirm new email</a>",
        callbackurl);

// send email to the user with the confirmation link
await userManager.SendEmailAsync(user.Id, subject: "Email confirmation", body: htmlContent);



// then this is the action to confirm the email on the user
// link in the email should be pointing here
public async Task<ActionResult> ConfirmEmail(string userId, string code)
{
    var confirmResult = await userManager.ConfirmEmailAsync(userId, code);

    return RedirectToAction("Index");
}

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