AUTOCOMPLETE extender - asp.net

Question

I am trying to use Autocomplete Extender in my Project but its not working and I am using Vs2008 .net framework 3.5
and also it gives me error for grid-view paging that source is not available
this my .aspx code
<asp:TextBox ID="txtsearch" runat="server" Width="158px" CssClass="text"
Height="22px" ontextchanged="txtsearch_TextChanged"/>
<cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
ServiceMethod="GetFilterCategoryName" CompletionSetCount="1" CompletionInterval="10"
EnableCaching="true" MinimumPrefixLength="1" TargetControlID="txtsearch"
UseContextKey="true">
</cc1:AutoCompleteExtender>
this is my Axpx.cs code
[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod()]
public static List<string> GetFilterCategoryName(string prefixText)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["MainConnStr"].ConnectionString);
conn.Open();
SqlCommand cmd = new SqlCommand("select Question from quick_search where Question like #Name+'%'", conn);
cmd.Parameters.AddWithValue("#Name", prefixText);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
List<string> answer = new List<string>();
for (int i = 0; i < dt.Rows.Count; i++)
{
answer.Add(dt.Rows[i][1].ToString());
}
return answer;
}

Answer 1

Add a script Manager to the aspx file.
Try like this
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods = "true"></asp:ScriptManager>
<asp:TextBox ID="txtsearch" runat="server" Width="158px" CssClass="text" Height="22px" ontextchanged="txtsearch_TextChanged"/>
<cc1:AutoCompleteExtender ServiceMethod="GetFilterCategoryName"
MinimumPrefixLength="1"
CompletionInterval="0" EnableCaching="false" CompletionSetCount="10"
TargetControlID="txtsearch"
ID="autoCompleteExtender1" runat="server" FirstRowSelected = "false">
</cc1:AutoCompleteExtender>
COde Behind:
[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod()]
public static List<string> GetFilterCategoryName(string prefixText)
{
SqlConnection conn = new sqlConnection(ConfigurationManager.ConnectionStrings["MainConnStr"].ConnectionString);
conn.Open();
SqlCommand cmd = new SqlCommand("select Question from quick_search where Question like #Name+'%'", conn);
cmd.Parameters.AddWithValue("#Name", prefixText);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
List<string> answer = new List<string>();
for (int i = 0; i < dt.Rows.Count; i++)
{
answer.Add(dt.Rows[i][1].ToString());
}
return answer;
}