Passing Model to the partial view doesn't work - asp.net-mvc

Question

The file "Add.cshtml" is calling the partial view "_ManagePartial.cshtml" and passing the "Model""however the "Model " is not being picked up in the partial view.
When I include the code that's on the partial view into "Add.cshtml" everything works great.
Please advise what I''m doing wrong.
Error Message:
Click here to see the error message screenshot
File: _ManagePartial.cshtml
<div class="row">
<div class="col-md-4">
<div class="form-group">
#Html.LabelFor(model => model.UserName)
#Html.EditorFor(model => model.UserName, new { htmlAttributes = new { #class = "form-control input-lg" } })
#Html.ValidationMessageFor(model => model.UserName, "", new { #class = "text-danger" })
</div>
<div class="form-group">
#Html.LabelFor(model => model.UserPassword)
#Html.EditorFor(model => model.UserPassword, new { htmlAttributes = new { #class = "form-control input-lg" } })
#Html.ValidationMessageFor(model => model.UserPassword, "", new { #class = "text-danger" })
</div>
<div class="form-group"><button type="submit" class="btn btn-primary btn-lg">Submit</button></div>
</div>
<div class="col-md-4">
<div class="form-group">
#Html.LabelFor(model => model.UserEmail)
#Html.EditorFor(model => model.UserEmail, new { htmlAttributes = new { #class = "form-control input-lg" } })
#Html.ValidationMessageFor(model => model.UserEmail, "", new { #class = "text-danger" })
</div>
<div class="form-group">
#Html.LabelFor(model => model.UserConfirmPassword)
<input type="password" class="form-control input-lg" name="UserConfirmPassword">
</div>
</div>
</div>
File: Add.cshtml
#model CardDistro.Models.AddUserViewModel
#{
ViewBag.Current = "Users#Index";
String Action = ViewBag.FormAction;
}
<h2 class="page-header">#ViewBag.Title</h2>
#using (Html.BeginForm(Action, "Users", FormMethod.Post, new { id = "SiteAddUserContainer" }))
{
<input type="hidden" name="UserID" value="#Model.UserID" />
if (ViewBag.Retval != null){
<div class="row"><div class="col-md-8"><div class="alert alert-danger">#ViewBag.Retval</div></div></div>
}
Html.RenderPartial("_ManagePartial", Model);
}

Answer 1

_ManagePartial.cshtml needs to identify the model by starting the partial view with
#model CardDistro.Models.AddUserViewModel
so the compiler knows what to do with model=>UserName