What's the meaning of these lines

[Christine25]

Hi, I'm working on C# ASP.Net MVC, still a newbie... and want to know the meaning of these below lines.

I usually use it without knowing what exactly it does... and today want to know what it is.

When I create default Microsoft template for ASP.Net MVC then I got these.

also, is there another way to make it?

Seems lile the last line is a property as I can see (set/get) !!! not sure.

public AccountController()
: this(new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext())))
{
}

public AccountController(UserManager<ApplicationUser> userManager)
{
UserManager = userManager;
}

public UserManager<ApplicationUser> UserManager { get; private set; }

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