Ajax AutoCompleteExtender with MSSQL datasource

I’m building a form and wanted to use the autocompleteextender control of the Ajax Toolkit. Having limited skills with ASP.net and C#, I began by looking for examples online. However, nothing I found and tried seemed to be working. I finally found a simple example here that helped me get on my way.

I’ve reproduced my code below as a self-reference, and to hopefully help someone else avoid troubles with this control.



<!-- Need to have the toolkitscript manager in your page -->
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePageMethods="true" >
<!-- Textbox that the autocomplete will target -->
<asp:TextBox ID="CEMPNAMETextBox" runat="server" Text='<%# Bind("CEMPNAME") %>' />
<!-- AutocompleteControl -->
<asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
                            UseContextKey="True" />

TargetControlID – the ID of the textbox that we’ve chosen to use
ServiceMethod – name of the method as defined in your codebehind file

Default.aspx.cs (C#)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace ITIventory
    public partial class _Default : System.Web.UI.Page
            [System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
            public static string[] GetCompletionList(string prefixText, int count, string contextKey)
                List ListCempName = new List(); // List Object
                    // Open the connection (can re-use connection string as defined in web.config)
                    SqlConnection SqlCon = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ITInventoryConnectionString"].ConnectionString);
                    // Create a Command
                    SqlCommand SqlComm = new SqlCommand();
                    SqlComm.Connection = SqlCon;
                    // Add a employee name SQl Parameter
                    SqlComm.Parameters.Add("@cempname", SqlDbType.VarChar).Value = prefixText; // retrievable throught prefixText parameter
                    // Query for get country name from database
                    SqlComm.CommandType = CommandType.Text;
                    SqlComm.CommandText = "SELECT cempname FROM BMEMP WHERE (BMEMP.LISTERM = 'false') AND (BMEMP.cempname LIKE ''+@cempname+'%') ";
                    // Read the data and add in List object.
                    SqlDataReader SqlDr = SqlComm.ExecuteReader();
                    if (SqlDr != null)
                        while (SqlDr.Read())
                catch (Exception ex)
                    throw new Exception(ex.Message);
                return ListCempName.ToArray();

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