Here is my Model Class

         //--WorkpassType ---//
        //[Required(ErrorMessage = "Please Select WorkPass Type")]
        [Display(Name = "WorkPass Type"), StringLength(20)]
        public string WorkpassType { get; set; }
    
        //--Workpass Expiry Date ---//
        //[Required(ErrorMessage = "Please Select WorkPass Expiry Date")]
        [Display(Name = "WorkPass Expiry Date")]
        [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
        [DataType(DataType.Date)]
        public DateTime? WorkpassExpiryDate { get; set; }



Index.cshtml

        <form method="post" id="FormBiodata" enctype="multipart/form-data">
            <partial name="_BioData" />
            <div class="form-group row">
                <div class="col-sm-10" style="margin-left:800px;">
                    <input type='submit' class='btn btn-success' value='Save' />
                    <input type="submit" id="BtnSubmit" asp-page-handler="InsertBioData" style="display:none;" />
                </div>
            </div>
        </form>



Javascript Validation   

    $('#FormBiodata').submit(function (e) {
                //e.preventDefault();           
                //var WorkPassType = $('#DropDownWorkPassType').val();
                if ($('#DropDownWorkpassType').val() === "") {                
                    $("#SpanWorkPassExpiryDate").hide();
                    this.submit(); 
                }
                else {                
                    $("#SpanWorkPassExpiryDate").html("Please Enter WorkPass Expiry Date");                
                    return false;
                }
            });