Intellisense in Text box

use Ajax Auto Complete Control for your requirement,want to know more about auto complete control go through the link http://www.asp.net/ajaxlibrary/act_AutoComplete.ashx

see this also http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/AutoComplete/AutoComplete.aspx

I tried using the same. I have taken the service method path as the aspx name. In the public function I am returning 2 strings.
When I am building the application and entering the first 2 characters its not giving me any popup. Can you provide some sample code for the Service Method.

create webservice for your DB

ex..

[WebMethod]

public string[] Information(string prefixText)

{

 int count = 10;

 string sql = "Select * from t.b Where column_Name like @prefixText";

 SqlDataAdapter da = new SqlDataAdapter(sql,"Your Connection String Comes Here"));

 da.SelectCommand.Parameters.Add("@prefixText", SqlDbType.VarChar, 50).Value = prefixText+ "%";

 DataTable dt = new DataTable();

 da.Fill(dt);

 string[] items = new string[dt.Rows.Count];

 int i = 0;

 foreach (DataRow dr in dt.Rows)

 {

  items.SetValue(dr["Country_Name"].ToString(),i);

  i++;

 }

 return items;

} 

call the above webservice method in extender method

ServicePath="WebService.asmx"

ex..

<cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" MinimumPrefixLength="1" ServiceMethod="Information" ServicePath="WebService.asmx" TargetControlID="TextBox1"> </cc1:AutoCompleteExtender>

hi
if windows application then follow below link...

http://santoshdotnetarena.blogspot.com/2009/10/in.html


Regards
Santosh