SQL Connection (Exception fail)
When trying to connect to sql through sqlconnection I get an error, "NullReferenceException was unhandled" "An unhandled exception of type 'System.NullReferenceException' occurred in DBLabControllers.dll
Additional information: Objektreferensen har inte angetts till en instans av ett objekt."
Why do I get exception fail and how do I fix it?
Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Windows.Forms;
namespace DBLabs
{
public class DBConnection : DBLabsDLL.DBConnectionBase
{
public DBConnection()
{
string connectionString = null;
SqlConnection connection;
connectionString = "Data Source=(local);Initial Catalog=www3.idt.mdh.se;User ID=ezi15001;Password=********";
connection = new SqlConnection(connectionString);
}
public override bool login(string username, string password)
{
string constring = "Data Source = www3.idt.mdh.se;" + "Database=" + username + "_db;" + "User ID=" + username + ";" + "Password=" + password;
SqlConnection myConnection = new SqlConnection(constring);
try
{
myConnection.Open();
}
catch (Exception)
{
myConnection.Close();
return false;
}
finally
{
myConnection.Close();
}
return true;
}
}
