Validation not working

Hi

 public class Location
    {
        public Location()
        {
        }

        [Key]
        [Display(Name = "Id")]
        public string Id { get; set; }

        [DataType(DataType.Text)]
        [RegularExpression(@"^[a-zA-Z'.\s]{1,25}$", ErrorMessage = "Special Characters not allowed")]
        [Required(ErrorMessage = "Please enter Location"), MaxLength(25)]
        [Display(Name = "Description")]
        public string Description { get; set; }

        [Required]
        public bool IsActive { get; set; }


    }

@using (Html.BeginForm("CreateEdit", "Location", FormMethod.Post))
        {
            <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
                <div class="modal-dialog modal-sm">
                    <div class="modal-content">
                        <div class="modal-header">
                            <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
                            <h4 class="modal-title"></h4>
                        </div>
                        <div class="modal-body">
                            @Html.ValidationSummary(false, "", new { @class = "text-danger" })
                            <div class="form-horizontal">
                                <div class="form-group row">
                                    <label class="control-label col-sm-3" for="Id">Id</label>
                                    <div class="col-sm-9">
                                        <input type="text" class="form-control form-control-sm" id="txtId" name="Id" placeholder="Id" autofocus>
                                    </div>
                                </div>
                                <div class="form-group row">
                                    <label class="control-label col-sm-3" for="Description">Description</label>
                                    <div class="col-sm-9">
                                        <input type="text" class="form-control form-control-sm" id="txtDescription" name="Description" placeholder="Description">
                                    </div>
                                </div>
                                <div class="form-group row">
                                    <label class="control-label col-sm-3" for="IsActive">Active</label>
                                    <div class="form-check col-sm-9">
                                        <input class="form-check-input col-sm-9" type="checkbox" id="IsActive">
                                        <input type="hidden" id="hfIsActive" name="IsActive" />
                                    </div>
                                </div>
                            </div>
                        </div>

                        <div class="modal-footer">
                            <button type="button" class="btn btn-sm btn-default m-r-5" data-dismiss="modal">Cancel</button>
                            <button type="submit" class="btn btn-primary">Save Changes</button>
                        </div>
                    </div>
                </div>
            </div>
        }

Thanks