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This problem has been plaguing me for two days now. There are some similar posts, but none that address my problem completely. Using MVC-3, Razor syntax: -- EDIT.cshtml -- @using (Html.BeginForm("Edit", "My", FormMethod.Post, new { enctype = "multipart/form-data" })) {  <div class="editor-field"> @Html.TextAreaFor(m => m.LongDescription) @Html.ValidationMessageFor(m => m.LongDescription) </div>  <input name="button" type="submit" value="Add Picture" />  @foreach(var thumbnail in Model.ThumbnailImagePathAndNames) { <img src="@Url.Content(@thumbnail.ThumbnailPicturePath)" alt="" width="200" /> @Html.RadioButtonFor(o=>o.SelectedImage, @thumbnail.ImageGUID) Primary Picture  @Html.CheckBoxFor(o=>thumbnail.Delete) Delete ????????  } <input id="Submit1" name="button" type="submit" value="Complete Edit!" /> } -- MyController.cs -- [HttpPost] public ActionResult Edit(String button, HttpPostedFileBase file, MyMainModel model) { // if button = submit picture, work with picture here and break(long story) // save model data // if valid, save and redirect // not valid or error, load up view like normal but with error messages model.LoadThumbnails(); return View(model); } -- MyMainModel.cs -- public class MyMainModel { // some properties... public Guid? SelectedImage { get; set; } [Display(Name = "Detailed Description")] public String LongDescription { get; set; } // some more properties.... // and finally my list of models

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