Pass model from a view to a controller (MVC)

Question

When passing the model from my view to my controller, the data is all null. I was able to successfully pass it using an ActionLink but I don't think that is the best way; for security reasons (I do not want sensitive data in the querystring).

My models

public class DashboardModel
{
    // Dasboard quick numbers
    public int TotalUsers { get; set; }
    public int TotalUnauthUsers { get; set; }
    public int GamesPlayed { get; set; }
    public int AssociatedGroups { get; set; }
    public int TotalGroups { get; set; }

    // Dashboard table
    public IEnumerable<ManageUserData> UnauthUsers { get; set; }

}

public class ManageUserData
{
    public string UserName { get; set; }
    public int AlternateId { get; set; }
    public string Email { get; set; }
    public string Role { get; set; }
    public IEnumerable<string> InvestigatorGroups { get; set; }
    public string Institution { get; set; }

    // User status
    public bool AccountLocked { get; set; }
    public bool EmailConfirmed { get; set; }
}

Snippet of my view

@model TestGame.ViewModels.DashboardModel

@foreach (var user in Model.UnauthUsers)
{
    <tr>
        <td>@user.UserName</td>
        <td>@user.AlternateId</td>
        <td>@user.Email</td>
        <td>@user.Role</td>
        <td>
            @if (!user.EmailConfirmed)
            {
                <div class="text-warning">Unconfirmed Email</div>
            }
            @if (user.AccountLocked)
            {
                <div class="text-danger">Account Locked</div>
            }

        </td>
        <td>

            @if (user.AccountLocked || !user.EmailConfirmed)
            {

                using (Html.BeginForm("Manage", "Admin", FormMethod.Post))
                {
                    @Html.HiddenFor(x => user.UserName)
                    @Html.HiddenFor(x => user.Email)

                    <input type="submit" value="Manage" />

Answer 1

You have to make sure the path starts with the object being posted back; what you have will work great if the action being posted to (HttpPost Admin/Manage action) takes an object of type User; if it takes an object of the model type, change your form to the following:

for (var i = 0; i < Model.UnAuthUsers.Count; i++)

 using (Html.BeginForm("Manage", "Admin", FormMethod.Post))
                {
                    @Html.HiddenFor(x => x.UnAuthUsers[i].UserName)
                    @Html.HiddenFor(x => x.UnAuthUsers[i].Email)

                    <input type="submit" value="Manage" />

Creating a reference from the model (being x) will do the trick.

EDIT: Based on comments, add two properties to your model:

public class DashboardModel
{
   public string SelectedUserName { get; set; }
   public string SelectedEmail { get; set; }
}

In your form, render a hidden for for that name; I've had trouble using HiddenFor, so I've in the past used the hidden directly:

using (Html.BeginForm("Manage", "Admin", FormMethod.Post))
{
   <input type="hidden" name="@Html.NameFor(i => i.SelectedUserName)" value="@Model.UnauthUsers[i].UserName" />
   <input type="hidden" name="@Html.NameFor(i => i.SelectedEmail)" .. />

And upon submitting the form, the user from that form will be posted back via the model, via these new properties.