Trigger (Call) TextBox TextChanged event on JavaScript OnBlur event in ASP.Net

@m7mdm3ode,i tried on textchange event it works for me,below is the sample code,

HTML:

 <asp:TextBox runat="server" ID="txtblur" OnTextChanged="txtblur_TextChanged" AutoPostBack="true"  onchange="texboxchange()"></asp:TextBox>

 JavaSript

  <script type="text/javascript">
        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 });
            },2);
        }
        function texboxchange() {
            ShowProgress();
            var txtBox = document.getElementById('<%= txtblur.ClientID %>');
            var count = txtBox.value.length;
            if (count == 2) {
                document.getElementById('<%= txtblur.ClientID %>').focus();
            return true; // this will call textbox changed event.
        }
    }
</script>

 Codebehind c#:

   protected void txtblur_TextChanged(object sender, EventArgs e)
            {
       
         System.Threading.Thread.Sleep(5000);

          //  txtblur.Focus();
            txtblur.Text = "testing";
      
        }