How to set span and class in html.actionlink in MVC

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MVC3

dear friends,

I have designed a grid in mvc... that grid have columns and edit update delete links.. i need to set icon for edit update and delete links.. but i have link like this:

.RenderValueAs(c =>Html.ActionLink("Edit", "Edit", new { MRNo = c.MRNo }));

how to set icon for this:

What I have tried:

For eg:

<a href="#" class="add btn btn-warning btn-sm" data-user="my"><i class="fa fa-plus"></i></a>