• Ways to deployment: XCOPY, Automated setup application
• Use XCOPY only when there is no external dependencies other than .Net framework. And it is guaranteed that .Net framework is installed in all the target machines. Also, make sure the application directory contains all the files.
• Command example: XCOPY d:myApplication c:deployedApplication /s — /s indicates subdirectories will also be copied
• Setup Applications: two types: setup projects and merge module projects
• Setup projects: installs your application to the target machine
• Merge module projects: Used to deploy controls and components. It can be merged with a setup project
• To create setup project: File Menu->Add Project -> New Project->setup project-> setup project creation wizard comes. Select options as appropriate. It will be mostly common sense.
• Merge module project: File Menu->Add Project -> New Project->setup and deployment project-> setup wizard. Select options as appropriate. It will be mostly common sense.
• Setup project is also displayed in the project explorer. Right click and select properties to provide build properties.

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Post Data:2007-06-12 05:01:23

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Debug and Trace classes in .Net

You can always debug your applications line by line. However, when the applications get very bigger/larger, debugging line by line may not be an efficient way for finding errors in code. Debug and Trace classes are handy in such cases. Using Debug and Trace classes, you can find errors and write them in a file or create an event log. Later, you can check the file or the event log to see what kinds of errors the applications are causing. They both provide the same functionalities except that Debug class works only in the debug mode. Trace can work even after the applications are released and also you can control the error reporting from released versions. In a .config file you can change the behaviour of the Trace class.

Logging Trace Output into a text file

• 1. Create a FileStream object instance and map it to a file
• 2. Create a TextWriterTraceListener instance and make the text file as the targe of this listener
• 3. Add this listener to the Trace.Listeners collection
• 4. set Trace.AutoFlush to be true
• 5. where required you can use Trace.Write method to send error messages to the file
• 6. Trace.Write, Trace.WriteLine, Trace.WriteIf, Trace.WriteLineIf can be used to send error message to the file
• 7. Trace.Assert method writes error messages only if the supplied condition fails. Trace.Assert also displays the error in a MessageBox
• 8. Trace.Fail causes an Trace.Assert unconditionally

Logging Trace outout into an Event Log

• 1. Create or open an EventLog
• 2. Set the Source property of Event Log
• 3. Create an instance of EventLogTraceWriter and specify the new event log as it’s target
• 4. Use Trace.AutoFlush[automatic sending], or Trace.Flush [send error messages explicitly]
• 5. Where required, you can use Trace.Write method to send error messages to the file
• 6. Trace.Write, Trace.WriteLine, Trace.WriteIf, Trace.WriteLineIf can be used to send error messages to the file
• 7. Trace.Assert method writes error messages only if the supplied condition fails. Trace.Assert also displays the errors in a MessageBox
• 8. Trace.Fail causes a Trace.Assert unconditionally

TraceSwitches

TraceSwitch/BooleanSwitch class can be used to control the error messaging that the Trace class generates.

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Overview of ADO.net

Purpose

• Components of ADO.net and their functions

ADO.net provides disconnected database access to make minimum resource (RAM,Page Table,Heap) use. Database connections are open as long as the connection is required. Afterwards, the connection is just closed. If connections are kept active and if new connections are used for new operations, the system resource will easily used up. Further, it can consume database licenses quickly.

ADO.net has two major entities. DataSet and Data Provider

Data Set

Data set is in-memory representation of data. After querying a database, you may keep your data in a DataSet. DataSet may contain 0, one or more tables. The tables in DataSet are termed as DataTables. DataTables have two concepts/collections DataColumns, and DataRows. DataRows contain the data. DataSet also contains DataRelations collections that may be used to create relations among the DataTables in the DataSet. Additionally, DataSet contains ExtendedProperties collections to contain custom information about the DataSet

Data Provider

It is actually a collection of several components. Some data provider objects are:

• SQL Server Data Provider: To interact with MSSQL Server Databases
• OLE DB.Net data provider: May be used to interact with other databases.
• ODBC (.Net) Data provider
• Oracle Data Provider: For efficient interaction with Oracle Databases

Data Provider Components

• Connection Object: To connect to the database. Objects: SqlConnection(for MS Sql Server), OleDbConnection(for wide range of databases), ODBC Connection(to connect through ODBC), OracleConnection(for oracle). The main property of Connection objects are the ConnectionString.
• Command Object: like SqlCommand, OleDbCommand. After creating a connection a command object may be used to query the database or to run a stored procedure. It has methods like ExecuteNonQuery(For Insert,Update,Delete), ExecuteScalar(to access a single value),ExecuteReader(returns ResultSet, may be kept in a DataReader object)
• DataReader Object: Like, SqlDataReader, OleDbDataReader, [ODBCDataReader,OracleDataReader]. It is a read-only, forward only, connected data stream. It uses the connection exclusively and tries to use minimum system resources[contain only one row in the RAM]
• DataAdapter Object: It is the object that provides disconnected data access in .Net. DataAdapter fills a DataSet or DataTable by using it’s Fill method. Unlike DataReader DataAdaptor can propagate the changes in DataSet/DataTable to the database using it’s Update method. DataAdapter contains queries(select,update,insert,delete) in four properties like SelectCommand, InsertCommand,DeleteCommand,UpdateCommand. When fill method is called the data returned by SelectCommand query are saved in DataSets/DataTables. Remember Update is another method, that copies DataSet data to the Database.

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Post Data:2011-04-13 13:10:46

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Basics of Exception Handling in .Net

Why exception handling? In your applications, unexpected error situations may occur that are out of your appication scope and your application logic. These are actually external to your application. For example, while you are reading a file from hard drive, the file may not be there; or the remote server may be too busy or unavailable to get back to you with the result of your query. Exception handling addresses such situations.

How can you handle such situations:

• Use try, catch, finally structure to address such situations
• Put the code where, you are anticipating an exception inside a try{} block. Put the code to handle the error situation in catch (Exception ex) {} blocks. You can have multiple catch blocks where each one will address a specific type of exception situation.
• One more note, the code block where exception may occur may need to execute some logic/code whether an exception occurs or or not such as closing a file, closing the database connection. To accomplish this, you can use a finally block. A finally block is always executed, regardless of whether an exception is thrown or not.
• When an exception occurs, the events are thrown by the environment. You need to address that if you want to. Else, your users will see the errors and will cause a bad user experience.
• You can even throw exceptions on your own in your code. But why? say if you anticipate that there will be some error situations that are not external but related to your application logic and you actually do not want to handle those situations (serve some services in those situations for example) in your application. You can just throw exceptions and think that these are the conditions; you do not want to support in your application. Throw exception and provide some generalized response to your visitors.
• You can also handle exceptions throw the web objects’ built in error events such as Page_Error, Global_Error, Application_Error.
• In certain situations, You can take advantage of the error pages of the webserver to provide useful information to your visitors. You can replace the default error pages of your web-server and provide customized error pages to your visitor
• Finally, you can use tracing to log the error events. Monitor the tracing to understand which types of situations occur more frequently than others. And find out a solution and apply the solution
• It is possible to turn on and off this tracing without modifying the application code. You can make use of the web.config file configurations

Regarding error pages, you can provide your custom error pages for the standard HTTP error codes. Some codes are given below:204:No Content, 301:Moved, Moved Permanently, 302: Found, Redirect, 400:bad request, 401:unauthorized, 403: forbidden, 404:not found, 408:request time out, 500:internal server error, 503:service unavailable, 505:Http version not supported.

You can also make use of the errorPage attribute of the Page object to define an error page for the exceptions of that particular page. Page level settings override the application level settings (as provided by web.config file)

• How to enable application level tracing: use something similar as below in your web.config file

  { and } are used instead of  respectively. {configuration}         {system.web}            {trace enabled="true" requestLimit="40" localOnly="false"/}         {/system.web}   {/configuration}

• to enable tracing for a particular page, use the trace property of the Document object
• how to write tracing information to the trace log: Trace.Warn()

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Post Data:2012-06-07 19:04:36

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Encryption and .Net

Dot net provides rich support for data encryption. the namespace System.Security.Cryptography includes the encryption features.There are three primary concepts related to encryption such as Hashing, Symmetric Encryption, and Asymmetric encryption. A hash is a data fingerprint, a small data that represents the uniqueness of a large block of data. In Symmetric Encryption, a single key is used for both encryption and decryption. In Asymmetric encryption, two different keys are used, one for encryption and another one for decryption. In real world applications, a combination of all three methods are used to provide better security.

A digital transmission of a check can be as follows: create the hash of the check, encrypt the hash with the public key using asymmetric encryption, apply the encrypted hash on the document, encrypt the symmetric encryption key with asymmetric encryption method, encrypt the check with symmetric encryption, transmit the encrypted key and encrypted document to the receiver

Hash Example

   hash = New Encryption.Hash(Encryption.Hash.Provider.CRC32)   data = New  Encryption.Data("Hash Browns")   hash.Calculate(data)

Symmetric example:

 sym = New Encryption.Symmetric(Encryption.Symmetric.Provider.Rijndael)  key = New Encryption.Data("Pass")   Encryption.Data encryptedData;  encryptedData = sym.Encrypt(New Encryption.Data("Secret"), key) string base64EncryptedString = encryptedData.ToBase64

Asymmetric Example

  asym = New Encryption.Asymmetric    pubkey = New Encryption.Asymmetric.PublicKey    privkey = New Encryption.Asymmetric.PrivateKey  asym.GenerateNewKeyset(pubkey, privkey) secret = "ancient chinese"  Encryption.Data encryptedData   encryptedData = asym.Encrypt(New Encryption.Data(secret), pubkey)   Encryption.Data decryptedData   asym2 = New Encryption.Asymmetric   decryptedData = asym2.Decrypt(encryptedData, privkey)

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Allow Page Access only to the Logged in Users

• It’s common across many sites that you allow certain pages of your site only to the logged in users.
• Here, I am providing a simple way to do that in your site
• The main idea is, when users’ credentials are verified, we store the information in the session object. Later, if a restricted page is being accessed, we check if the user is a verified/(logged in) user, if so we allow him access otherwise not
• You can use individual session variables to store some information about the user and logged in status. However, that may not be a great way. Better, to use an object to store user information and login status information. Then throw that object to the session variable.
• You will need to use this object (session variable) across your site in all restricted pages; hence, using global variables concept may help.
• Here, I will present code that will show you 1. a class to store user information 2. global variables class implementing the method to check if any user is logged in [from anywhere in your application] 3. a login form that will create a user object to store user information upon successful login and throw that object in session 4. a test restricted page that will check if any user is logged – if yes, go forward else redirect the user to the login page
• The class for storing user information is as below. You can keep the class in the App_Code folder
• Now the Global Variables Class. You can keep the class in the App_Code folder
• Now the login form (frontend) code
• Now the login form backend code. Check the method that checks for login credentials and create the logged in user object
• The test page that will restrict access for not logged in users.

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