Autocomplete from database

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Hi,

I implemented an autocomplete textbox using following code and it works fine :

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="AutoComplete2._Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public static string[] GetCompletionList(string prefixText, int count)
{
    return "this is sample text".Split();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
        </asp:ToolkitScriptManager>
        <asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
        <asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
            ServiceMethod="GetCompletionList"
            CompletionInterval="500"
            ServicePath="" TargetControlID="TextBox1"
            EnableCaching="true"
            CompletionSetCount="20"
            DelimiterCharacters=";, :"
            UseContextKey="True">
        </asp:AutoCompleteExtender>
        <br />
    </div>
    </form>
</body>
</html>

I want the autocomplete to read from database. And i tried using the following code in above script, but it didn't work and shows some error
in "SqlConnection oConn = new SqlConnection(connect);" part:

XML

<script>
        public string[] GetCompanyName(string prefixText, int count)
        {
            string sql = "Select * from Table1 Where Company_Name like '" + prefixText + "%" + "'";
            string connect = ConfigurationManager.AppSettings["Conn"];
            SqlConnection oConn = new SqlConnection(connect);
            SqlDataAdapter da = new SqlDataAdapter(sql, oConn);
            da.SelectCommand.Parameters.Add(@prefixText, SqlDbType.NVarChar, 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["Company_Name"].ToString(), i);
                i++;
            }
            return items;
        }
</script>

could anyone tell me where's the wrong? Is my code above correct?

Posted 15-Aug-10 16:34pm

pwtc222

Updated 15-Aug-10 19:35pm

Kunal Chowdhury «IN»

v2

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Kunal Chowdhury «IN» 16-Aug-10 1:36am

Reason for Edit: Proper code formatting & remove grammatical errors.

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Al-Farooque Shubho · Answer 1 · 2010-08-15T17:22:00

Assuming that, the connection string is properly configured in the configuration manager (In Web.config) and the following code returns a valid connection string,

string connect = ConfigurationManager.AppSettings["Conn"];

You need to open the connection using the following code:

C#

try
{
    oConn.Open();
}
catch (Exception ex)
{
    //You can log your exception message here
}
finally
{
  // Closing sql Connection
  oConn.Close();
}

If the connection is not opened, the DataAdapter (SqlDataAdapter) won't be able to fetch data from the database. Hopefully, this will solve the problem. :)

pwtc222 · Answer 2 · 2010-08-15T18:08:00

Hi,thanks friend.
I have solved the problem.
I added following code on aspx file:

<code>
<%@ Import Namespace = "System.Data" %>
<%@ Import Namespace = "System.Data.SqlClient" %></code>

And this code on cs file:

using System.Data.SqlClient;

it works fine,it reads and suggests from database.

The complete code will look like this :

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="AutoComplete2._Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<%@ Import Namespace = "System.Data" %>
<%@ Import Namespace = "System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
    public static string[] GetCompletionList(string prefixText, int count)
    {
        string conString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlConnection connection = new SqlConnection(conString);
        connection.Open();
        SqlParameter prm;
        string sql = "Select Company_Name FROM Table1 WHERE Company_Name LIKE @prefixText";
        SqlDataAdapter cmd = new SqlDataAdapter(sql, connection);
        prm = new SqlParameter("@prefixText", SqlDbType.VarChar, 50);
        prm.Value = prefixText + "%";
        cmd.SelectCommand.Parameters.Add(prm);
        DataTable dt = new DataTable();
        cmd.Fill(dt);
        string[] items = new string[dt.Rows.Count];
        int i = 0;
        foreach (DataRow dr in dt.Rows)
        {
            items.SetValue(dr["Company_Name"].ToString(), i);
            i++;
        }
        connection.Close();
        return items;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
        </asp:ToolkitScriptManager>
        <asp:TextBox ID="TextBox1" runat="server" Height="22px" Width="252px" ></asp:TextBox>
        <asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
            ServiceMethod="GetCompletionList"
            CompletionInterval="500"
            ServicePath="" TargetControlID="TextBox1"
            EnableCaching="true"
            CompletionSetCount="20"
            DelimiterCharacters=";, :"
            UseContextKey="True">
        </asp:AutoCompleteExtender>
        <br />
    </div>
    </form>
</body>
</html>

Autocomplete from database

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