view AutoCompleteExtender on focus of the textbox

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I have a textbox and an autocomplete extender. The Code is executing perfectly. But I want open the list as and when I focus on the textbox.

Please suggest.
I used all these code.

ASP

<asp:TextBox ID="TextBox3" runat="server" Width="268px"                   ontextchanged="TextBox3_TextChanged" AutoPostBack="true" onblur="Change(this, event)" onfocus="Change(this, event)"></asp:TextBox>
           
<ajax:autocompleteextender ID="AutoCompleteExtender1"  runat="server" TargetControlID="TextBox3" MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1" CompletionInterval="10" ServiceMethod="GetCountries"
CompletionListCssClass="autocomplete_completionListElement"                 CompletionListItemCssClass="autocomplete_listItem"                CompletionListHighlightedItemCssClass="autocomplete_highlightedListItem">
</ajax:autocompleteextender>

[System.Web.Script.Services.ScriptMethod()]
    [System.Web.Services.WebMethod]
    public static List<string> GetCountries(string prefixText)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalSqlServer"].ConnectionString.ToString());
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from table1 where col1 like @id+'%'", con);
        cmd.Parameters.AddWithValue("@id", 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][0].ToString());
        }
        return CountryNames;
    }

please help me.
My question is "How to open the list of autocompleteextender, when my cursor focus the textbox".
Please help

Posted 21-Dec-12 9:53am

Sourav Sarkar-SS2

Updated 22-Dec-12 18:18pm

v3

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Krunal Rohit · Answer 1 · 2012-12-21T18:02:00

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        AutoCompleteExtender1.ContextKey = "ace1";
    }

    [System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]
    public static string[] GetCompletionList(string prefixText, int count, string contextKey)
    {
        string[] result = new string[6];
        for (int i = 0; i < 6; i++)
        {
            result[i] = prefixText + i.ToString();
        }
        return result;
    }


</script>


<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>


</head>
<body>


    <form id="form1" runat="server">
    <ajaxToolkit:ToolkitScriptManager ID="ScriptManager1" runat="server" />

    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <ajaxToolkit:AutoCompleteExtender MinimumPrefixLength="0" ID="AutoCompleteExtender1"
            ServiceMethod="GetCompletionList" runat="server" TargetControlID="TextBox1">
        </ajaxToolkit:AutoCompleteExtender>
    </div>

    </form>

</body>
</html>

You can certainly have a reference from it, like MinimumPrefixLength="0"
Source : ASP .NET Forum[^]