@using(Html.BeginForm())
{
   <div class="form-group">
       @Html.LabelFor(m => m.Field1, new { @class = "control-label" })
       @Html.TextBoxFor(m => m.Field1, new { @class = "form-control" })
       @Html.ValidationFor(m => m.Field1)
   </div>
   <div class="form-group">
       @Html.LabelFor(m => m.Field2, new { @class = "control-label" })
       @Html.TextBoxFor(m => m.Field2, new { @class = "form-control" })
       @Html.ValidationFor(m => m.Field2)
   </div>
   <div class="form-group">
       <div class="checkbox">
          @Html.CheckBoxFor(m => m.BoolField)
          @Html.LabelFor(m => m.BoolField)
       </div>
   </div>
   <div class="form-control">
       @Html.LabelFor(m => m.CustomEditorField, new { @class = "control-label" })
       @Html.EditorFor(m => m.CustomEditorField, new { htmlAttributes = new { @class = "form-control" }})
       @Html.ValidationFor(m => m.CustomEditorField)
   </div>
}

@using(Html.BeginForm())
{
       @Html.FormGroupFor(m => m.Field1)
       @Html.FormGroupFor(m => m.Field2)
       @Html.FormGroupFor(m => m.BoolField)
       @Html.FormGroupFor(m => m.CustomEditorField)
}

@using(Html.BeginForm())
{
       using(Html.FormContext(c => c.Horizontal(labelColMd: 3, columns: 12)))
       {
         @Html.FormGroupFor(m => m.Field1)
         @Html.FormGroupFor(m => m.Field2)
         @Html.FormGroupFor(m => m.BoolField)
         @Html.FormGroupFor(m => m.CustomEditorField)
       }
}

@using(Html.BeginForm())
{
       @Html.FormGroups(f => {
          f.Add(m => m.Field1, c => c.HtmlAttributes("myCoolCssClass").Label("Замена текста label"));
          f.Add(m => m.Field2);
          f.Add(m => m.BoolField);
          f.Add(m => m.CustomEditorField);
       })
}