会话中还有其他线程在运行

Question

我的控制器代码：

public ActionResult groupeditSubmit(List<string> barC, int PID = -1, int TID = -1, string DateT = "", int nPID = -1, int nTID = -1, string nDateT = "")
    {
            ViewBag.PID = new SelectList(db.Places, "ID", "Name", 0);
            ViewBag.TID = new SelectList(db.Transferees, "ID", "FullName", 0);
            ViewBag.DateT = DateT;
            var studentList = db.Database.ExecuteSqlCommand("Update Barcode set PID = '"+nPID+ "' ,TID='"+nTID+ "' , DateT = '"+nDateT+ "' where (PID = "+PID+ " AND TID = "+TID+ " AND DateT = '"+ DateT + "' )");
            db.SaveChanges();
            return RedirectToAction("groupedit");
    }

我的查看代码：

@model IEnumerable<barkod.Models.Barcode>
@{
    ViewBag.Title = "groupedit";
    Layout = "~/Views/Shared/_LayoutPanel.cshtml";
}
</form>
@if (Model.Count() > 0)
{
    <div class="row text-center">
        <form method="post" action="groupeditSubmit">
            <table class="table table-responsive">
                <tr>
                    <th>
                        بارکد
                    </th>
                    <th>
                        مکان
                    </th>
                    <th>
                        تحویل گیرنده
                    </th>
                    <th>
                        تاریخ تحویل
                    </th>
                </tr>
                @foreach (var item in Model)
                {
                    <tr>
                        <td>
                           <input name="barc" value="@Html.DisplayFor(modelItem => item.barC)" class="hidden" />
                            @Html.DisplayFor(modelItem => item.barC)
                        </td>
                        <td>
                            @Html.DisplayFor(modelItem => item.Place.Name)
                        </td>
                        <td>
                            @Html.DisplayFor(modelItem => item.Transferee.FullName)
                        </td>
                        <td>
                            @Html.DisplayFor(modelItem => item.DateT)
                        </td>
                    </tr>
                }
            </table>
            <div class="form-group">
                <div class="col-md-10">
                    @Html.DropDownList("nTID", null, htmlAttributes: new { @class = "form-control", required = "required" })
                </div>
            </div>
            <div class="form-group">
                <div class="col-md-10">
                    @Html.DropDownList("nPID", null, htmlAttributes: new { @class = "form-control", required = "required" })
                </div>
            </div>
            <div class="form-group">
                <div class="col-md-10">
                    @Html.Editor("nDateT", new
           {
               htmlAttributes = new
               {
                   @class = "form-control"@*, Type = "date"*@,
                   required = "required",
                   @Value = ViewBag.DateT
               }
           })
                    @*<input type="button" id= "exampleI" class="btn-danger" value="#" name="Date" data-mddatetimepicker="true" data-placement="right" data-trigger="click" data-targetselector="#exampleI" required />*@
                </div>
            </div>
            <div class="form-group hidden">
                <div class="col-md-10">
                    @Html.DropDownList("TID", null, htmlAttributes: new { @class = "form-control", required = "required" })
                </div>
            </div>
            <div class="form-group hidden">
                <div class="col-md-10">
                    @Html.DropDownList("PID", null, htmlAttributes: new { @class = "form-control", required = "required" })
                </div>
            </div>
            <div class="form-group hidden">
                <div class="col-md-10">
                    @Html.Editor("DateT", new
           {
               htmlAttributes = new
               {
                   @class = "form-control"@*, Type = "date"*@,
                   required = "required",
                   @Value = ViewBag.DateT
               }
           })
                    @*<input type="button" id= "exampleI" class="btn-danger" value="#" name="Date" data-mddatetimepicker="true" data-placement="right" data-trigger="click" data-targetselector="#exampleI" required />*@
                </div>
            </div>

            <input type="submit" class="btn btn-success" value="ویرایش گروهی" />
        </form>
    </div>
}

在我的本地主机中可以，但是当它在服务器中运行时，会出现此错误：

  

“ /”应用程序中的服务器错误。   不允许新事务，因为会话中有其他线程正在运行。   说明：执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪，以获取有关错误及其在代码中起源的更多信息。   异常详细信息：System.Data.SqlClient.SqlException：不允许新事务，因为会话中正在运行其他线程。