@using (Html.BeginForm("CreateEdit", "Customer", FormMethod.Post))        
{
    @Html.AntiForgeryToken()
    <input type="hidden" id="hfAU" name="hfAU" value="A" />
    <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    @*<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span>Close</button>*@
                    <h4 class="modal-title"></h4>
                </div>
                <div class="modal-body" id="myModalBody">
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
                    <button type="submit" class="btn btn-primary">Save Changes</button>
                </div>
            </div>
       </div>
    </div>
}

$('body').on('click', '[id*=btnEdit]', function () {
    hfAU = "U";
    var data = $(this).parents('tr').find('td');
    var Id = data.eq(0).html();
    $('#hfId').val(Id);
    var url = "/Customer/CreateEdit?Id=" + Id;
    $("#myModalBody").load(url, function () {
        $(".modal-title").html("Update");
        $("#myModal").modal("show");
    });
});

public class Customer
{
    //private string _isactive = "Y";
    public Customer()
    {
        CreatedOn = DateTime.Now;
        //LastUpdatedOn = DateTime.Now;
    }
    [Key]
    [Required(ErrorMessage = "Id cannot be Blank. Max length should be less than or equal to 20."), MaxLength(20)]
    //[RegularExpression(@"^[ a-zA-Z\s]$", ErrorMessage = "Special Characters not allowed")]
    [Display(Name = "Id")]
    [Remote("IsExist", "Customer", ErrorMessage = "Id already exists")]
    public string Id { get; set; }

    [Display(Name = "Description")]
    [DataType(DataType.Text)]
    [Required(ErrorMessage = "Customer Name cannot be Blank. Max length should be less than or equal to 50"), MaxLength(50)]
    public string Description { get; set; }

    [Display(Name = "Active")]
    public bool IsActive { get; set; }
    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
    public DateTime CreatedOn { get; set; }
}

@model MyApplication.Models.Customer
<div class="form-horizontal">
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(model => model.Id, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Id, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Id, "", new { @class = "text-danger" })
        </div>
    </div>
    <div class="form-group">
    @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })
        </div>
    </div>
    <div class="form-group">
    @Html.LabelFor(model => model.IsActive, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        <div class="checkbox">
            @Html.EditorFor(model => model.IsActive)
            @Html.ValidationMessageFor(model => model.IsActive, "", new { @class = "text-danger" })
        </div>
    </div>
</div>

[HttpGet]
public ActionResult CreateEdit(string Id)
{
    return PartialView("_CreateEditCustomer", dbCustomer.GetById(Id));
}

Thanks