Problema insertar datos

[th3r0rn]

Hola tengo un problema con mi codigo, me dice que una palabra clabe no es permitida:
Palabra clave no admitida: 'data source(localhost);initial catalog'.
Mi codigo

Código:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

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

    }
    protected void Button1_Click(object sender, EventArgs e)
    {

    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
        String cadenaCon;
        String cadenaSql;
        SqlConnection cn;
        SqlCommand cmd;
        cadenaCon = "Data Source(localhost);";
        cadenaCon += "Initial Catalog=usuarios;";
        cadenaCon += "Integrated Security=SSPI";
        cadenaSql = "INSERT INTO infousers";
        cadenaSql += "VALUES('" + TextBox1.Text + "',";
        cadenaSql += "'" + TextBox2.Text + "')";
        cn = new SqlConnection(cadenaCon);
        try
        {
            cn.Open();
            cmd = new SqlCommand(cadenaSql, cn);
            cmd.ExecuteNonQuery();
            Label2.Text = "El usuario se dio de alta correctamente";
        }
        catch (Exception ex)
        {
            Label2.Text = "Error al registrar" + ex.Message;

        }
       
        
        finally
         

        {
        cn.Close();
        }

    }
}

AYUDA

[jaullo]

Prueba cambiando el (localhost) por (local)
ó
(.\sqlexpress)

Saludos,

[okhosting]

Creo que es un error de sintaxis. Intenta cambiando:

cadenaCon = "Data Source(localhost);";

por:

cadenaCon = "Data Source=localhost;";