hi guys! currently i have MS SQL server 2005 as my back-end/database but im planning to transfer from MS SQL 2005 to Oracle 10g. Can i have some advice on what to consider when changing database. Do I just need to change my connection string?

my current connection method:
Code:
        SqlConnStr = @"Data Source = " + txtSettingsDatasource.Text + "; Initial Catalog=" + txtSettingsDatabase.Text +
                     "; User ID=" + txtSettingsLogin.Text + "; " + "Password=" + RndCrypt(txtSettingsPassword.Text, default_key);


        public bool db_connection()
        {
            try
            {
                sqlConn = new SqlConnection(SqlConnStr);
                sqlConn.Open();
                return true;
            }
            catch (System.Data.SqlClient.SqlException ex)
            {
                //MessageBox.Show("DB CONNECTION ERROR: " + ex.Message + "\r\nPlease contact your administrator.","BCMD",MessageBoxButtons.OK,MessageBoxIcon.Error);
                show_error_message("db_connection", ex.Message);
                return false;
            }
        }