uCertify Articles » 70-315 http://www.ucertify.com/article Just another WordPress weblog Wed, 04 Nov 2009 00:00:00 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 What is Trace.axd? http://www.ucertify.com/article/what-is-traceaxd.html http://www.ucertify.com/article/what-is-traceaxd.html#comments Tue, 27 Oct 2009 00:00:00 +0000 uCertify 2600184

Trace.axd is an Http Handler that can be used to view the trace details for an application. This file resides in the application’s root directory. A request to this file through a browser displays the trace log of the last n requests in time-order, where n is an integer determined by the value set by requestLimit=”[n]” in the application’s configuration file.

Share/Bookmark]]> http://www.ucertify.com/article/what-is-traceaxd.html/feed 0 What is the function of the FROM clause? http://www.ucertify.com/article/what-is-the-function-of-the-from-clause-2.html http://www.ucertify.com/article/what-is-the-function-of-the-from-clause-2.html#comments Thu, 24 Sep 2009 00:00:00 +0000 uCertify 3501022

The FROM clause of the SQL SELECT statement is used to specify the table names that will be joined together to extract the data values. For example:

SELECT <attributes>
FROM <tables>
WHERE <condition>

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The ExecuteNonQuery method of the SqlCommand class is used to execute commands that change a database. These commands include the Transact-SQL INSERT, UPDATE, DELETE, and SET statements. The method acts directly on a database connection and does not require a data set. It returns an integer that indicates the number of rows affected by the execution of a command. This method can also be used to perform catalog operations, such as querying the structure of a database or creating database objects.

Share/Bookmark]]> http://www.ucertify.com/article/what-is-the-executenonquery-method-2.html/feed 0 What is the GetChildRows method? http://www.ucertify.com/article/what-is-the-getchildrows-method-2.html http://www.ucertify.com/article/what-is-the-getchildrows-method-2.html#comments Mon, 21 Sep 2009 00:00:00 +0000 uCertify 2600158

The GetChildRows method of the DataRow class is used to get the child rows of a DataRow object. The DataRow class defines four overloaded versions of the method. Their signatures are as follows:

Signature Description
Overloads Public Function GetChildRows(DataRelation) It is used to get the child rows of a DataRow by using the specified DataRelation, which is passed as a parameter to the method.
Overloads Public Function GetChildRows(String) It is used to get the child rows of a DataRow by using the specified RelationName of a DataRelation.
Overloads Public Function GetChildRows(DataRelation, DataRowVersion) It is used to get the child rows of a DataRow by using the specified DataRelation and DataRowVersion.
Overloads Public Function GetChildRows(String, DataRowVersion) It is used to get the child rows of a DataRow by using the specified RelationName of a DataRelation and DataRowVersion.

All the versions of the method return an array of DataRow objects.

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Following is the syntax for the WriteXml(string, XmlWriteMode) method of the DataSet class:

datasetobjectname.WriteXml(filename, mode);

where, datasetobjectname specifies the name of the DataSet object, filename specifies the name of the file, including the path, to which to write data, and mode specifies an XmlWriteMode value. Following are the values that can be used for XmlWriteMode:

XmlWriteMode value Description
DiffGram It specifies that a DataSet has to be written as a DiffGram containing current and original values.
WriteSchema It specifies that only the current values of a DataSet have to be written as XML data with the relational structure as inline XSD schema. It is the default XmlWriteMode.
IgnoreSchema It specifies that only the current values of a DataSet have to be written as XML data without an XSD schema.
Share/Bookmark]]> http://www.ucertify.com/article/what-is-the-writexmlstring-xmlwritemode-method-2.html/feed 0 What is the CreateEventSource method of the EventLog class? http://www.ucertify.com/article/what-is-the-createeventsource-method-of-the-eventlog-class-2.html http://www.ucertify.com/article/what-is-the-createeventsource-method-of-the-eventlog-class-2.html#comments Mon, 21 Sep 2009 00:00:00 +0000 uCertify 3101024

The CreateEventSource method of the EventLog class establishes an application as a valid event source for writing event information to a particular event log on a computer. The event log used to write entries can be the event log available by default on a computer or a custom event log. This method can also be used to create a custom event log on a computer.

The EventLog class defines two overloaded versions of the method. Their signatures are as follows:

  1. public static void CreateEventSource(string, string);

    This overloaded version of the method accepts two string parameters. The first string parameter represents the source name by which the application is registered on the local computer. The second string parameter is the name of the log that will be used for writing event information. If the log specified by the second string parameter does not exist, a custom log is created on the computer.

  2. public static void CreateEventSource(string, string, string);

    This overloaded version of the method accepts three string parameters. The first string parameter represents the source name by which the application is registered on the specified computer. The second string parameter is the name of the log that will be used for writing event information. The third string parameter is the name of the computer. If the log specified by the second string parameter does not exist on the specified computer, a custom log is created on the computer.

Share/Bookmark]]> http://www.ucertify.com/article/what-is-the-createeventsource-method-of-the-eventlog-class-2.html/feed 0 What is Web Setup project? http://www.ucertify.com/article/what-is-web-setup-project-2.html http://www.ucertify.com/article/what-is-web-setup-project-2.html#comments Tue, 01 Sep 2009 00:00:00 +0000 uCertify 1501180

The Web Setup project is a Setup and Deployment project, which is used to create installation packages for the deployment of Web-based applications such as XML Web services, Web applications etc., to a Web server. It creates an (.msi) installer package. Using the Web Setup project for deployment handles the registration and configuration issues automatically.

Note: The Web Setup project installs files into the virtual directory on a Web server.

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A destructor is a special type of method. It is used to destroy instances of a class when they are no longer used by an application. A destructor has the same name as the class in which it resides, preceded by a tilde (~) symbol. The garbage collector determines when the destructor of a class is to be called, and automatically calls it. The destructor implicitly calls the Object.Finalize method on the object’s base class. Following are some restrictions imposed on the usage of destructors:

  • Destructors can be used only with classes.
  • Destructors cannot be used with structs.
  • A class can contain only one destructor.
  • Destructors cannot be inherited.
  • Destructors cannot be overloaded.
  • Destructors cannot be called explicitly.
  • Destructors cannot take modifiers or parameters.
Share/Bookmark]]> http://www.ucertify.com/article/what-is-a-destructor-2.html/feed 0 What is SqlDataAdapter? http://www.ucertify.com/article/what-is-sqldataadapter-2.html http://www.ucertify.com/article/what-is-sqldataadapter-2.html#comments Tue, 01 Sep 2009 00:00:00 +0000 uCertify 1501195

SqlDataAdapter is a class used to represent a set of data commands and a database connection that are used to fill a DataSet and update a SQL Server database. It is used to retrieve and save data between a DataSet and a data source. The SqlDataAdapter class is used in conjunction with the SqlConnection and SqlCommand classes to enhance the performance while connecting to a SQL Server database.

Share/Bookmark]]> http://www.ucertify.com/article/what-is-sqldataadapter-2.html/feed 0 What is Sn.exe? http://www.ucertify.com/article/what-is-snexe-2.html http://www.ucertify.com/article/what-is-snexe-2.html#comments Mon, 31 Aug 2009 00:00:00 +0000 uCertify 1501041

Strong Name (Sn.exe) is a tool used to sign assemblies with strong names. It also provides signature generation, signature verification, and key management. Following is the syntax for using Sn.exe:

sn [options [parameters]]

where, the term options specifies the options to be used, and parameters specifies the parameters used with options. Following are the options that are commonly used with Sn.exe:

Option Description
-k It is used to generate a new key pair and write it to a specified file.
-i It is used to install a key pair from a specified key container that resides in a strong name Cryptographic Service Provider (CSP).
-p It is used to extract a public key from a key pair file and store it in another key pair file.
-v It is used to verify the strong name in an assembly.
-d It is used to delete a specified key container from the strong name CSP.
-D It is used to verify that two assemblies differ only by signature.
-Vx It is used to remove all verification-skipping entries.
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