The ObjectContext object has been deleted and cannot be utilized for any activities that require a connection.

I think as follows:

@model MatchGaming.Models.ProfileQuery
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>    
<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (Html.BeginForm("Results", "Profiles")) {
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>ProfileQuery</legend>
        @Html.EditorFor(model=>model.SearchString)
        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

I have the following HttpPost controller:

[HttpPost]
public ActionResult Results(ProfileQuery profileQuery)
{
    Debug.Write(profileQuery.SearchString);
    using(var db = new MatchGamingEntities())
    {
        var SearchUserName = db.Users.SingleOrDefault(a=> a.UserName.Contains(profileQuery.SearchString));
        var Users = from m in db.Users
                    join m2 in db.MyProfiles on m.UserId equals m2.UserId
                    where m.UserName == SearchUserName.UserName
                    select new UserViewModel
                    {
                        UserName = m.UserName,
                        LastActivityDate = m.LastActivityDate,
                        Address = m2.Address,
                        City = m2.City,
                        State = m2.State,
                        Zip = m2.Zip
                    };

        return View(Users.AsEnumerable());
    }
}

The View for Results is shown below:

@model IEnumerable<MatchGaming.Models.UserViewModel>    
@{
    ViewBag.Title = "Results";
}

<h2>Results</h2>

<fieldset>
    <legend>UserViewModel</legend>
    @foreach (var item in Model){
    <div class="display-label">UserName</div>
    <div class="display-field">@item.UserName</div>

    <div class="display-label">LastActivityDate</div>
    <div class="display-field">@String.Format("{0:g}", item.LastActivityDate)</div>

    <div class="display-label">Address</div>
    <div class="display-field">@item.Address</div>

    <div class="display-label">City</div>
    <div class="display-field">@item.City</div>

    <div class="display-label">State</div>
    <div class="display-field">@item.State</div>

    <div class="display-label">Zip</div>
    <div class="display-field">@item.Zip</div>
    }
</fieldset>

This error keeps occurring:

The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.

I'm stumped as to why.