Problem with Profiles in ASP .NET

I made an ASP .net application which use the asp .net login system. I use the a class which gets some details of the logged in user such as Name, address etc. In the page that the user can change his details i have those commands. If i don't use the commands in the page_load the address changes in the database successfully, but if i use them the database doesnt make the changes in the address. How is it possible? The profileC class uses the Inherits from ProfileBase class

       protected void Page_Load(o开发者_开发百科bject sender, EventArgs e)
    {
        if (HttpContext.Current.User.Identity.IsAuthenticated)
        {
            classes.ProfileC pr = classes.ProfileC.GetProfileC(HttpContext.Current.User.Identity.Name);

            TxtAddress.Text = pr.UserAddress;

        }

    }

    protected void BtnAdd_Click(object sender, EventArgs e)
    {
        classes.ProfileC pr = classes.ProfileC.GetProfileC(HttpContext.Current.User.Identity.Name);
        pr.UserAddress = TxtAddress.Text;

        pr.Save();
    }
}

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You need an If !IsPostback in your Page_Load with your current logic inside the if.

Don't forget when you press a button Page_Load will fire before the BtnAdd_Click