C#程序问题..错误 ；12 ；应为类、委托、枚举、接口或结构及其他

我正在为我的C#类写一个ATM应用程序。它从在线数据库获取信息。我一直收到几个错误，但我试图找出的是预期的类、委托、枚举、接口或结构错误。这是代码有什么想法吗

namespace ATMapp
{


public partial class Form1 : Form
    {
             // instance variables used to manipulate database

        private Connection myConnection;
        private Statement myStatement;
        private ResultSet myResultSet;
        string databaseURL = "http://www.boehnecamp.com/phpMyAdmin/razorsql_mysql_bridge.php";
        // establish connection to database

        try
         {

    // connect to database
            SQL sql = new SQL();
            myConnection = sql.getConnection(databaseURL);

    // create Statement for executing SQL
            myStatement = myConnection.createStatement(databaseURL);
         }
         catch (Exception)
              { 
               Console.WriteLine ("Cannot connect to database server");
              } 
    // close statement and database connection
         myStatement.close();
         myConnection.close();

     // load account numbers to accountNumberJComboBox

    private void loadAccountNumbers()
      {
      // get all account numbers from database
         try 
         {
            myResultSet = myStatement.executeQuery("SELECT accountNumber FROM accountInformation");

         // add account numbers to accountNumberJComboBox
            while ( myResultSet.next() )
            {
               accountComboBox = accountNumberComboBox.Item.Add(myResultSet.getString( "accountNumber" ) );
               //ComboBox accountNumberComboBox = new ComboBox();
            }

            myResultSet.close(); // close myResultSet

         } // end try

             catch ( Exception)
            {
               Console.WriteLine("Error in loadAccountNumbers");
            }

      } // end method loadAccountNumbers

    private void retrieveAccountInformation()
      {
      // get account information
         try 
         {
            myResultSet = myStatement.executeQuery( "SELECT pin, " + 
               "firstName, balanceAmount FROM accountInformation " +
               "WHERE accountNumber = '" + userAccountNumber + "'" );

         // get next result
            if ( myResultSet.next() )
            {
               pin = myResultSet.getString( "pin" );
               firstName = myResultSet.getString( "firstName" );
               balance = myResultSet.getDouble( "balanceAmount" );
            }

            myResultSet.close(); // close myResultSet

         } // end try

             catch (Exception)
            {
               Console.WriteLine("Error in retrieveAccountInformation");
            }

      } // end method retrieveAccountInformation
// update database after withdrawing

    private void updateBalance()
      {
      // update balance in database
         try
         {
            myStatement.executeUpdate( "UPDATE accountInformation" +
               " SET balanceAmount = " + balance + " WHERE " +
               "accountNumber = '" + userAccountNumber + "'" );
         }
             catch (Exception)
            {
               Console.WriteLine("Error in updateBalance");
            }

      } // end method updateBalance

---

如果你能说出错误发生在哪一行，这会有所帮助。问题是你只是把代码放在类的主体中，而不是放在方法中。正如@Siyual所说的。您需要在//将帐号加载到AccountNumberComboBox到方法之前，将代码从//build connection to database to放入。