uCertify Articles » 70-306 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 the ExecuteNonQuery method? http://www.ucertify.com/article/what-is-the-executenonquery-method-2.html http://www.ucertify.com/article/what-is-the-executenonquery-method-2.html#comments Mon, 21 Sep 2009 00:00:00 +0000 uCertify 2600152

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.

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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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The StrComp function is used to compare two strings alphabetically. The function takes three parameters. It is defined as follows:

StrComp(Str1, Str2, CompareMethod)

where, the first two parameters to the function (i.e., Str1 and Str2) are any valid String expressions that are to be compared. The third parameter (i.e., CompareMethod) is optional. If this parameter is not present, the Option Compare setting in the module determines the type of comparison. If this parameter is present, then it specifies the criteria of string comparison (either Binary or Text). If the Text comparison method is used, Visual Basic will ignore case when comparing letters. If the Binary comparison method is used, the case of the letters will matter.

The StrComp function returns the following values:

Return value Condition
-1 If Str1 comes before Str2 in a sort based on ASCII code.
0 If Str1 is equal to Str2.
+1 If Str1 comes after Str2 in a sort based on ASCII code.
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The HelpNamespace property of a HelpProvider control is used to specify the name and location of the help file associated with the current HelpProvider control. The HelpNamespace property takes the fully qualified path and name of the help file. The help file can be either a compiled help file (.chm) or an HTML file.

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HelpNavigator is an additional property that a form and all the controls on the form receive when a HelpProvider control is added to it. If the HelpNamespace property of the HelpProvider control on a form is set to a help file, this property determines which elements of the help file to display when the F1 key is pressed. The HelpNavigator property can be set to one of the following enumeration values as shown in the table below:

Value Description
Topic Specifies that the help topic of the associated help file will be displayed.
TableOfContents Specifies that the table of contents of the associated help file will be displayed.
Index Specifies that the index of the associated help file will be displayed.
Find Specifies that the search page of the associated help file will be displayed.
AssociativeIndex Specifies that the index for a specified topic will be performed in the associated help file.
KeywordIndex Specifies that the search page of the associated help file will be displayed and the help document will be searched for a specified keyword.
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The Click event of a menu item occurs when a user clicks the menu item. This event also occurs when a user selects the menu item by using the keyboard and presses the Enter key. Moreover, this event is also raised if a user accesses the menu item using the access key or the shortcut key defined by the MenuItem control. This event is not raised for parent menu items.

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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.
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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.

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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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