he input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. in MVC4

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ASP.NET

SQL-Server-2008R2

MVC4

Below is my View Code---

model IkkosAdminPortalWebSite.Models.RecordDetails

@{
ViewBag.Title = "Add";
Layout = "~/Views/Shared/_Layout.cshtml";
}

Add

@using (Html.BeginForm("Add", "RecordDetails", FormMethod.Post, new { enctype = "multipart/form-data", @data_ajax = "false" })) {
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)


RecordDetails

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

}
*******
Model Class is---

public class RecordDetails
{
    public string Actor { get; set; }
    public string Owner { get; set; }
    public string Category { get; set; }
    public string SubCategory { get; set; }
    public string Movement { get; set; }
    public HttpPostedFileBase Thumbnail { get; set; }
    public string IAPProductId { get; set; }
}

********
In Controller ActionResult code:

[HttpPost]
public ActionResult Add(RecordDetail record, HttpPostedFileBase Thumbnail)
// public ActionResult Add(RecordDetail record)
{
if (ModelState.IsValid)
{

RecordDetail objrec = new RecordDetail();
if (Thumbnail != null && Thumbnail.ContentLength > 0)
{
var filename = Path.GetFileName(Thumbnail.FileName);
objrec.Thumbnail = System.Text.Encoding.UTF8.GetBytes(filename);

}

objList.RecordDetails.Add(record);

objList.SaveChanges();
return RedirectToAction("RecordDetails");
}
return View(record);
}

*****************
DataBase ---Thumbnail Column DataType is Image.