How can I set id using Html.EditorFor with MVC3

You should change to

@Html.TextBoxFor(x => x.Order, new { id = string.Format("Order_{0}", Model.Row) })

The second parameter of @Html.EditorFor is for view data, not for html attributes

@Html.EditorFor(x => x.Order, null, string.Format("Order_{0}", Model.Row))

have you tried creating an editor template for your x.Order?

have this on your editor template:

<input type="text" id="@ViewData["id"]">

and use this on your view page:

@Html.EditorFor(x => x.Order, new { id = string.Format("Order_{0}", Model.Row) })

I know this question is pretty old, but all I needed to do was the following:

@Html.EditorFor(modelItem => item.EndDate, 
                new { htmlAttributes = new { @class = "form-control", @id = @endID } })

You can give it whatever classes or id that you want/need. I have this earlier in my page as well to create a different ID for each item:

string endID = "end-" + @item.ID;

Hopefully this helps someone in the future.

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