Question

I am using visual studio 2010 and Oracle 10g. Operating system: Windows 7 home basic. If I use the following code in visual studio 2005, I am getting a correct output. But in Visual Studio 2010 I get an error

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OracleClient;
using System.Windows.Forms;

public partial class Default2 : System.Web.UI.Page
{
    OracleConnection con = new OracleConnection("uid=scott;pwd=tiger;data source=");
    OracleCommand cmd = new OracleCommand();
    OracleDataReader dr;
    string name1, pass1;
    protected void Page_Load(object sender, EventArgs e)
    {
        con.Open();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        cmd = new OracleCommand("Select* from tb1 where name='" + TextBox1.Text + "'and pass='"+TextBox2.Text + "'", con);
        dr = cmd.ExecuteReader();
        while (dr.Read())
        {
            name1 = dr[0].ToString();
            pass1 = dr[1].ToString();
        }
        if (name1 == TextBox1.Text && pass1 == TextBox2.Text)
        {
            Response.Redirect("Home.aspx");
        }
        else
        {
            MessageBox.Show("Incorrect user name or password");
        }
    }
}

Answer 1

It could be a problem with the tnsnames.ora, where your connection is defined.

You can omit tnsnames.ora with this connection string:

OracleConnection con = new OracleConnection("Data Source=(DESCRIPTION =(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = !!!!!!!!YOURDBNAME!!!!!!!!!)(SERVER = DEDICATED))); User Id=Scott;Password=tiger;");