Question

This code

    @Html.TextBoxFor(m => m.UserName, new { @class = "validate[required]", disabled = "disabled", value = ViewBag.user[0].UserName }) @Html.ValidationMessage("usernameVal", "*")

trows an exception when it get to ViewBag.user[0].UserName

Exception:

The best overloaded method match for ‘System.Web.Security.MembershipUserCollection.this[string]’ has some invalid arguments

Action:

 public ActionResult EditUser()
    {

        //Resgata username do registro
        string user = Request.QueryString["username"];

        try 
        {   //Se nome foi resgatado
                String.IsNullOrEmpty(user)

                MembershipUserCollection muc = Membership.FindUsersByName(user);
                ViewBag.user = muc;


            return PartialView();

        }
        catch (Exception e)
        {

            return Content("Erro: " + e);

        }

    }

Answer 1

In your view, you are accessing the collection using the integer index

ViewBag.user[0]

As the Exception states, to access the MembershipUserCollection you need to provide a string argument.

See the documentation – http://msdn.microsoft.com/en-us/library/system.web.security.membershipusercollection.item.aspx

Gets the membership user in the collection referenced by the specified user name.

Instead of returning a collection from your Controller method, just return the single MembershipUser object

In your controller:

        MembershipUser membershipUser = Membership.GetUser(user, false);
        ViewBag.user = membershipUser;

In your view:

Replace value = ViewBag.user[0].UserName with value = ViewBag.user.UserName