Using (Ajax.BeginForm("Index", "Brand", FormMethod.Post, New AjaxOptions With {
                                        .InsertionMode = InsertionMode.Replace,
                                        .UpdateTargetId = "GridList"}))
@Html.TextBox("strName", Nothing, New With {.class = "form-control", .PlaceHolder = "XXXXX"})
<button type="submit" style="display: none">Search</button>

<button type="submit" style="display: none" id="btn-search">Search</button>

$(function () {

    $("#btn-search").trigger("click");

})