Home > ASP.Net, Jquery > Check UserName Availability with JQuery using Memebership

Check UserName Availability with JQuery using Memebership


try this example to Check UserName Availability with JQuery using Memebership

First You’ll need to download jquery.js from http://docs.jquery.com/Downloading_jQuery.

The current version is 1.2.6.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script src="scripts/jquery-1.2.6.js" type="text/javascript"></script>
<script type = "text/javascript">
function ShowAvailability() {
        type: "POST",
        url: "Default.aspx/CheckUserName",
        data: '{userName: "' + $("#<%=txtUserName.ClientID%>")[0].value + '" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: OnSuccess,
        failure: function(response) {
function OnSuccess(response) {
    var mesg = $("#mesg")[0];

    switch (response) {
        case "true":
            mesg.style.color = "green";
            mesg.innerHTML = "Available";
        case "false":
            mesg.style.color = "red";
            mesg.innerHTML = "Not Available";
        case "error":
            mesg.style.color = "red";
            mesg.innerHTML = "Error occured";
function OnChange(txt) {
   $("#mesg")[0].innerHTML = "";
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
         UserName :
    <asp:TextBox ID="txtUserName" runat="server"
        onkeyup = "OnChange(this)"></asp:TextBox>
    <input id="btnCheck" type="button" value="Show Availability"
        onclick = "ShowAvailability()" />
    <br />
    <span id = "mesg"></span>

and in code behind :-

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
    public static string CheckUserName(string userName)
        string returnValue = string.Empty;
            if (Membership.GetUser(userName) != null)
                returnValue = "false";
                returnValue = "true";
            returnValue = "error";
        return returnValue;

    protected void Page_Load(object sender, EventArgs e)


Hope this helps

Good Luck

Categories: ASP.Net, Jquery
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