search button click show table

Hi Expert,

code is attached.

i want that when my form is loaded then only search form visible to user(means only ui show to user),' and when user click on search button then the grid table display the result.

in this code on form load its showing the records in the grid. please suggest how we can
 do it

////code

@model IEnumerable<MVCDemo.Models.Employee>

@{
    ViewBag.Title = "Index";
}
<div style="font-family:Arial">
<h2>Employee List</h2>
<p>
    @using (@Html.BeginForm("Index", "Home", FormMethod.Get))
    {
        <b>Search By:</b>
        @Html.RadioButton("searchBy", "Name", true) <text>Name</text>
        @Html.RadioButton("searchBy", "Gender") <text>Gender</text><br />
        @Html.TextBox("search") <input type="submit" value="search" />
    }
</p>
<table border="1">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Name)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Gender)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Email)
        </th>
        <th>Action</th>
    </tr>
@if (Model.Count() == 0)
{
    <tr>
        <td colspan="4">
            No records match search criteria
        </td>
    </tr>
}
else
{
    foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Gender)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Email)
            </td>
            <td>
                @Html.ActionLink("Edit", "Edit", new { id = item.ID }) |
                @Html.ActionLink("Details", "Details", new { id = item.ID }) |
                @Html.ActionLink("Delete", "Delete", new { id = item.ID })
            </td>
        </tr>
    }
}
</table>
</div> 

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///

controller

///

public ActionResult Index(string searchBy, string search)
{
    if (searchBy == "Gender")
    {
        return View(db.Employees.Where(x => x.Gender == search || search == null).ToList());
    }
    else
    {
        return View(db.Employees.Where(x => x.Name.StartsWith(search) || search == null).ToList());
    }
}

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///////////
table script

Create table tblEmployee
(
 ID int identity primary key,
 Name nvarchar(50),
 Gender nvarchar(10),
 Email nvarchar(50)
)

Insert into tblEmployee values('Sara Nani', 'Female', 'Sara.Nani@test.com')
Insert into tblEmployee values('James Histo', 'Male', 'James.Histo@test.com')
Insert into tblEmployee values('Mary Jane', 'Female', 'Mary.Jane@test.com')
Insert into tblEmployee values('Paul Sensit', 'Male', 'Paul.Sensit@test.com')

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