Handling Field Validations with Loading Progress in ASP.Net

I solved my question..I changed Jquery

function ShowProgress() {
    setTimeout(function () {
        var modal = $('<div />');
        modal.addClass("modal");
        $('body').append(modal);
        var loading = $(".loading");
        loading.show();
        var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
        var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
        loading.css({ top: top, left: left });
    }, 200);
}
function disableBtn(btnID, newText) {

    Page_IsValid = null;

    if (typeof (Page_ClientValidate) == 'function') {
        Page_ClientValidate();
    }

    var btn = document.getElementById(btnID);
    var isValidationOk = Page_IsValid;

    if (isValidationOk !== null) {

        if (isValidationOk) {
            ShowProgress();

        }
        else {
            btn.disabled = false;
        }
    }
    else {
        setTimeout("setImage('" + btnID + "')", 10);
        btn.disabled = true;
        btn.value = newText;
    }
}
function setImage(btnID) {
    var btn = document.getElementById(btnID);
    btn.style.background = 'url(loading.gif)';
}

And write code on button...

OnClientClick="disableBtn(this.id, 'Submitting...')" UseSubmitBehavior="false"