关于C#的odbcConnection连接超时有关问题

关于C#的odbcConnection连接超时问题
我用C#做了一个Sqlserver的自动备份迁移的功能，但用odbc连接数据库后，备份大的数据库时，时间一长就出错。提示：

System.Data.Odbc.OdbcException: ERROR [HYT00] [Microsoft][ODBC SQL Server Driver]超时已过期
  at System.Data.Odbc.OdbcConnection.HandleError(OdbcHandle hrHandle, RetCode retcode)
  at System.Data.Odbc.OdbcCommand.ExecuteReaderObject(CommandBehavior behavior, String method, Boolean needReader, Object[] methodArguments, SQL_API odbcApiMethod)
  at System.Data.Odbc.OdbcCommand.ExecuteReaderObject(CommandBehavior behavior, String method, Boolean needReader)
  at System.Data.Odbc.OdbcCommand.ExecuteNonQuery()
  at AutoSQLbackup.Form1.backupDatebase(String backType) in D:\AutoSQLbackup\AutoSQLbackup\Form1.cs:line 274

我已经设了ODBC的连接超时了，但不起效,以下是连接的设置

C# code

OdbcConnection dbConn = null;string connectString = "Driver={SQL Server};Server="                                       + serverName                                       + ";UID=" + userName                                       + ";PWD=" + pword                                       + ";Database=" + dbName + ";";dbConn = new OdbcConnection(connectString);dbConn.ConnectionTimeout = 60 * 60 * 2;dbConn.Open();return dbConn;