OleDb reads Access, "unspecified error" Exception

C # Use Oledb to connect to Access. Some exceptions may occur in conn. Open (): It's okay to restart the program. What is the problem? Capture System. Data. OleDb. OleDbExceptionMessage unspecified error SourceMicrosoftJETDatabaseEngineErrorCode-2147467259StackTrace: in S

C # Use Oledb to connect to Access. Some exceptions may occur in conn. Open (): It's okay to restart the program. What is the problem? Capture System. Data. OleDb. OleDbException Message = unspecified error Source = Microsoft JET Database Engine ErrorCode =-2147467259 StackTrace: in S

C # Use Oledb to connect to Access, and some will see the following in conn. Open ():Exception:

There is no problem with restarting the program. What is the problem?

Capture System. Data. OleDb. OleDbException
Message = NotSpecifyOfError
Source = Microsoft JET Database Engine
ErrorCode =-2147467259
StackTrace:
In System. Data. OleDb. OleDbConnectionInternal.. ctor (OleDbConnectionString constr, OleDbConnection connection)
In System. Data. OleDb. OleDbConnectionFactory. CreateConnection (DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool, DbConnection owningObject)
In System. Data. ProviderBase. DbConnectionFactory. CreateNonPooledConnection (DbConnection owningConnection, DbConnectionPoolGroup poolGroup)
In System. Data. ProviderBase. DbConnectionFactory. GetConnection (DbConnection owningConnection)
In System. Data. ProviderBase. DbConnectionClosed. OpenConnection (DbConnection outerConnection, DbConnectionFactory connectionFactory)
In System. Data. OleDb. OleDbConnection. Open ()
In NSCEV. Database. Attribute. Opera. MDBManager. GetConnection (String path) Location D: \ HBEDI \ Src \ Library \ NSCEV. Database. Attribute \ Opera \ MDBManager. cs: Row 29
In NSCEV. database. attribute. opera. MDBManager. queryToDT (String path, String SQL) Location D: \ HBEDI \ Src \ Library \ NSCEV. database. attribute \ Opera \ MDBManager. cs: row number 34
In NSCEV. HBEDI. powerLineDesign. aidedDesignForm. frmTowerBestChoice. frmTowerBestChoice_Load (Object sender, EventArgs e) Location D: \ HBEDI \ Src \ HBEDI \ NSCEV. HBEDI. powerLineDesign \ AidedDesignForm \ FrmTowerBestChoice. cs: Row 245
InnerException: