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C#
      [System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
public static string[] GetCompletionList(string prefixText, int count, string contextKey)
{
        SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=registration;Integrated Security=True");
    con.Open();
    SqlCommand cmd = new SqlCommand("select Country from Country where Country like @Name+'%'", con);
    cmd.Parameters.AddWithValue("@Name", prefixText);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataTable dt = new DataTable();
    da.Fill(dt);
    List<string> CountryNames = new List<string>();
    for (int i = 0; i < dt.Rows.Count; i++)
    {
        CountryNames.Add(dt.Rows[i][1].ToString());
    }
    //return CountryNames;
   return default(string[]);
}


Source Page----

XML
<asp:TextBox ID="TextBox1" runat="server" ontextchanged="TextBox1_TextChanged"></asp:TextBox>
              <cc1:AutoCompleteExtender ID="TextBox1_AutoCompleteExtender" runat="server"
                  DelimiterCharacters="" Enabled="True" ServiceMethod="GetCompletionList"
                  ServicePath="" TargetControlID="TextBox1" UseContextKey="True">
              </cc1:AutoCompleteExtender>
Posted
Updated 15-Dec-12 6:27am
v2
Comments
Dheerendra Dwivedi 16-Dec-12 8:34am    
i want to work without webservice

ServicePath=""
should be like
ServicePath="AutoComplete.asmx"

Without WebService :
ASP.Net Ajax AutoCompleteExtender Without Using Web Service[^]
http://www.aspdotnet-suresh.com/2011/05/ajax-autocompleteextender-sample.html[^]

or else, your code :
C#
[System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
    public static List<string>GetCompletionList(string prefixText, int count, string contextKey)
    {
            SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=registration;Integrated Security=True");
        con.Open();
        SqlCommand cmd = new SqlCommand("select Country from Country where Country like @Name+'%'", con);
        cmd.Parameters.AddWithValue("@Name", prefixText);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        List<string> CountryNames = new List<string>();
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            CountryNames.Add(dt.Rows[i][1].ToString());
        }
        return CountryNames;   // returning List<>, and you were returning String[], which is null..
    }
 
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v3
Hi,

Please refer below code

<asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
TargetControlID="txtcity"
ServicePath="~/WebService.asmx"
ServiceMethod="GetCompletionList"
CompletionInterval="1000"
MinimumPrefixLength="1"
EnableCaching="true"
CompletionSetCount="10"
CompletionListItemCssClass="CssClass"
/>


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;

/// <summary>
/// Summary description for WebService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService
{
Connection con = new Connection();
public WebService () {

//Uncomment the following line if using designed components
//InitializeComponent();
}

[WebMethod]
public string HelloWorld() {
return "Hello World";
}
[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public string[] GetCompletionList(string prefixText, int count)
{

DataTable dt = con.GetdataTable("SELECT CityName from citymaster Where CityName like '" + prefixText + "%'");
List<string> st = new List<string>();
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
st.Add(dt.Rows[i]["CityName"].ToString());
}

}

return (st.ToArray());
}

}
 
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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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