Method 1 (using Handlers)
<connectionStrings>
<addname="constr"connectionString="Data Source = .\SQLExpress;
Initial Catalog = Northwind; Integrated Security = true"/>
</connectionStrings>
AutoComplete Handler
<%@ WebHandler Language="C#" Class="Search_CS" %>
using System;
using System.Web;
using System.Data.SqlClient;
using System.Configuration;
using System.Text;
public class Search_CS : IHttpHandler {
public void ProcessRequest (HttpContext context) {
string prefixText = context.Request.QueryString["q"];
using (SqlConnection conn = new SqlConnection())
{
conn.ConnectionString = ConfigurationManager
.ConnectionStrings["constr"].ConnectionString;
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandText = "select ContactName from Customers where " +
"ContactName like @SearchText + '%'";
cmd.Parameters.AddWithValue("@SearchText", prefixText);
cmd.Connection = conn;
StringBuilder sb = new StringBuilder();
conn.Open();
using (SqlDataReader sdr = cmd.ExecuteReader())
{
while (sdr.Read())
{
sb.Append(sdr["ContactName"])
.Append(Environment.NewLine);
}
}
conn.Close();
context.Response.Write(sb.ToString());
}
}
}
public bool IsReusable {
get {
return false;
}
}
}
Client Side Implementation
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link href="css/jquery.autocomplete.css" rel="stylesheet" type="text/css" />
<script src="scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script src="scripts/jquery.autocomplete.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#<%=txtSearch.ClientID%>").autocomplete('Search_CS.ashx');
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtSearch" runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>
Javascript
<script type="text/javascript">
$(document).ready(function() {
$("#<TextBoxControlId>").autocomplete('<Url of handler>');
});
</script>
Method 2 (using web Methods)
Aspx page
protected void Page_Load(object sender, EventArgs e)
{
}
[WebMethod]
public static List<string>
GetAutoCompleteData(string username)
{
List<string> result = new List<string>();
using (SqlConnection con
= new SqlConnection("Data Source=SureshDasari;Integrated
Security=true;Initial Catalog=MySampleDB"))
{
using (SqlCommand cmd
= new SqlCommand("select DISTINCT UserName from UserInformation
where UserName LIKE '%'+@SearchText+'%'", con))
{
con.Open();
cmd.Parameters.AddWithValue("@SearchText",
username);
SqlDataReader dr =
cmd.ExecuteReader();
while (dr.Read())
{
result.Add(dr["UserName"].ToString());
}
return result;
}
}
}
Javascript in Head section of the page
$(".autosuggest").autocomplete({
source: function(request,
response) {
$.ajax({
type: "POST",
contentType: "application/json;
charset=utf-8",
url: "Default.aspx/GetAutoCompleteData",
data: "{'username':'" +
document.getElementById('txtSearch').value + "'}",
dataType: "json",
success: function(data)
{
response(data.d);
},
error: function(result)
{
alert("Error");
}
});
}
});
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