CODEWITHSUNDEEP
c#asp.netajax
user3166530
user3166530

Reputation:

autocmplete in asp.net with ajax

I am trying to autocomplete textbox, and i downloaded source code from any website, Here is aspx page code

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Ajax AutoCompleteExtender without Webservice</title>
</head>
<body>
<form id="form1" runat="server">
<ajax:ToolkitScriptManager ID="ScriptManager1" runat="server"/>
<div>
<asp:TextBox ID="txtCountry" runat="server"></asp:TextBox>
<ajax:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"       
      TargetControlID="txtCountry" 
      MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1"         
      CompletionInterval="1000" ServiceMethod="GetCountries" >
</ajax:AutoCompleteExtender> 
</div>
</form>

and here is codebehind file.

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    [System.Web.Script.Services.ScriptMethod()]
    [System.Web.Services.WebMethod]
    public static List<string> GetCountries(string prefixText)
  {
      SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ToString());
      con.Open();
      SqlCommand cmd = new SqlCommand("select varStateName from tblStateMaster where varStateName 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;
  }

}

It could not generate proper output and i am not able to debug this service, so how can i debug such service, and please tell me where is exact problem and which points should be remember for service and autocomplete, And one more thing can i do it with dropdownlist?

Upvotes: 0

Views: 183

Answers (1)

Dimitar Dimitrov
Dimitar Dimitrov

Reputation: 15138

I suspect the issue is in your query and more specifically in the %, try to include it in your parameter instead:

prefixText = string.Concat(prefixText, "%");
SqlCommand cmd = new SqlCommand("select varStateName from tblStateMaster where varStateName like @Name", con);

EDIT

Ok, so digging around, according to official examples from Microsoft, your method signature should look like this (notice the additional parameters):

public static string[] GetCountries(string prefixText)
{
   // your stuff
}

Upvotes: 1

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