protected void enter_Click(object sender, EventArgs e)
        {
           
            string connectString = @"Data Source=.\\SQLEXPRESS;Initial Catalog=MyDataBase;Integrated Security=True";
            SqlConnection myConnection = new SqlConnection(connectString);
            myConnection.Open();
            string sql = "exec validate_user '" + sql_fix(UserNickname.Text) + "','" + sql_fix(UserPassw.Text) + "'";
            SqlCommand cmd = new SqlCommand(sql, myConnection);
            SqlDataReader reader = cmd.ExecuteReader();
            //int result = -1;
            if (reader.GetInt32(0) > 0)
            {
                reader.GetInt32(0);
            }
            else
            {
                lbl_err.Visible = true;
                Server.Transfer("Default.aspx");
                //throw new Exception("Incorrect login!");
            }
            reader.Close();
            myConnection.Close();
            return;
        }

myConnection.Open();