MVC Tooltip Validation is a jQuery plugin that will convert Validation Messages in MVC App to a Bootstrap tooltip. Its simple, very simple .. just check Register View in this sample application
<div class="form-group">
@Html.LabelFor(m => m.UserName, new { @class = "col-md-2 control-label" })
<div class="col-md-10">
@Html.TextBoxFor(m => m.UserName, new { @class = "form-control" })
@Html.ValidationMessageFor(m => m.UserName)
</div>
</div>
And in document ready add
$("#UserName").tooltipValidation();
Or
$("form input").tooltipValidation({
placement: "right"
});