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How Do I...Use Assembly Version Policy?
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| Total Hit (994) |
A primary goal of the deployment system in the .NET Framework is to eliminate conflicts between applications caused by shared components and shared states (or DLL conflicts). A key solution to this problem is a robust versioning system. The .NET Framework records information about an application's d
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How Do I...Create a Publisher Policy Assembly?
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| Total Hit (972) |
A Publisher policy statement describes the compatibility of an assembly issued by the publisher of that shared assembly. See How Do I...Use Version Policy" to see how a publisher's policy statement fits into the overall .NET Framework version policy scheme. Publisher policy is commonly used in servi
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How Do I...Get the types in an assembly?
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| Total Hit (1004) |
This sample illustrates how to retrieve all the types for a given assembly. To look through the types of an assembly, you first need to identify the assembly you want to manipulate. Once you have an object reference to the assembly of interest, you can call the GetTypes method on that assembly, whic
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How Do I...List all the members of a type?
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| Total Hit (1081) |
This example lets you list the members for a given data type. The ability to list a type's members is a great way to quickly discover which elements are available. It is an important tool for reporting on your system as well as assisting in the development of user documentation. Using the Reflection
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How Do I...Invoke methods using reflection ?
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| Total Hit (1675) |
This sample illustrates how to invoke different kinds of methods through reflection. Because the names of the methods being invoked are stored in strings, this mechanism provides the capability to specify methods to be invoked at runtime, rather than at design-time, providing the scope to give your
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How Do I...Encrypt and Decrypt a file?
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| Total Hit (2728) |
The CryptoStream class in the System.Security.Cryptography namespace is used to easily define cryptographic transforms on any data stream. The constructor is defined as the following: CryptoStream (Stream argument, ICryptoTransform transform, CryptoStreamMode mode).
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How Do I...Generate and compare a hash value?
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| Total Hit (2309) |
It is easy to generate and compare hash values using the cryptographic resources contained in the System.Security.Cryptography namespace. Because all hash functions take input of type Byte[], it might be necessary to convert the source into a byte array before it is hashed.
To generate a hash val
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ADO.NET: Get Out Parameters from a Stored Procedure
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| Total Hit (552) |
Some stored procedures return values through parameters. When a parameter in a SQL statement or stored procedure is declared as "out", the value of the parameter is returned back to the caller; the value is stored in a parameter in the Parameters collection on the OleDbCommand or SqlCommand objects.
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ADO.NET: Populate a DataSet from a Database
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| Total Hit (590) |
Getting data from a database is easy, and working with data is easier than before. If you want the results from a database as a forward only, read-only stream of data, you can execute a command and retrieve the results using the DataReader. For examples on how to use a DataReader, see Retrieve Data
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ADO.NET: Update a Database from a DataSet
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| Total Hit (587) |
This topic illustrates how to update data in a database using a DataSet. It is important to remember that you can also insert, update, and delete data in a database directly using a SqlCommand. Understanding the concepts covered in Populate a DataSet from a Database will help you understand the curr
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ADO.NET: Handle Errors
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| Total Hit (1103) |
In addition to Try/Catch and exceptions, the new ADO.NET data architecture allows you to add error messages to each row of Data in a DataSet. SqlDataAdapters attach error messages to Rows if updates or other actions fail. Furthermore, you can filter for rows in error to present them to the user, or
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ADO.NET: Work with Relational Data
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| Total Hit (582) |
A DataSet can contain either unrelated tables or related tables. You can think of a DataSet as a document of data. In fact, an XML data document is like this, except it is based on a hierarchical paradigm. Because data is often stored in relational databases, the DataSet can handle both hierarchical
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ADO.NET: Work with Typed Data
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| Total Hit (640) |
ADO classic code provides late-bound access to values within its recordset through weakly typed variables. ADO.NET code enables you to access the data held in the DataSet through a "strongly typed" metaphor. This means you can access tables and columns that are part of the DataSet with user-friendly
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ADO.NET: Filter Data
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| Total Hit (551) |
There are many ways to filter data. One way is to filter data at the database command level, using a where clause on your query. A second way is to filter the data after it is in the DataSet. This topic covers filtering in the DataSet.
Once data is in a DataSet you can use methods on the DataSet t
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ADO.NET: Connection Pooling
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| Total Hit (572) |
This sample illustrates how to construct a pool of connections to a datasource. You will want to do this to deploy high-performance applications. In this example the pool is established in the connection string and managed automatically by the SqlConnection.
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ADO.NET: Generate XML with data from SQL Server
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| Total Hit (590) |
This sample illustrates how to produce XML from SQL Server using two different techniques. The first uses the ExecuteXmlReader method of SqlCommand to get an XmlTextReader, which is then populated into a DataSet using the ReadXml method of the DataSet class. The second uses the SqlDataAdapter to ext
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ADO.NET: Loading a native ADO recordset into a DataSet
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| Total Hit (1352) |
This sample illustrates using ADO recordsets with managed Datasets. To provide access to ADO Recordset and Record objects from ADO.NET, the OLE DB .NET Data Provider overloads the Fill method of the OleDbDataAdapter to accept an ADO Recordset object or an ADO Record object. Filling a DataSet with th
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ADO.NET: Retrieve Data using OLE DB
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| Total Hit (553) |
This sample illustrates how to read data from an OLE DB provider using the OleDbDataReader class. This class provides a way of reading a forward-only stream of data records from a data source. If you want to work with SQLServer 7.0 or higher, you should refer to the topic Retrieve Data from SQLServe
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ADO.NET: Retrieve Data from SQL Server
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| Total Hit (582) |
This sample illustrates how to read data from SQL Server using the SqlDataReader class. This class provides a way of reading a forward-only stream of data records from a data source. If you want to work with databases that have OLE DB interfaces or versions of SQL Server prior to SQL Server 7.0, see
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ADO.NET: Convert an ADO Application to ADO.NET
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| Total Hit (591) |
This is an example of an ADO application that has been ported to .NET without the original graphical interface. It also shows the usage of a forward-only read-only fast DataReader. It shows how to use a DataView class to take a table from a DataSet and operate on it in a fashion similar to the old A
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How Do I...Catch an Exception?
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| Total Hit (2050) |
This sample illustrates how to catch an exception. A try...catch...finally block is used in this sample. Any code that might throw an exception is placed inside of the try block. If an exception is thrown, the catch block is entered and the program can perform the appropriate operation to recover or
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How Do I...Throw an Exception?
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| Total Hit (1373) |
This sample illustrates how to throw an exception. A try..catch..finally block is used in to illustrate to use and catch the exception you threw. It is important to remember that when you throw an exception, you need to document the exception you throw, so that users are aware they need to include a
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How Do I...Enumerate directories and their contents?
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| Total Hit (1273) |
This sample illustrates how to use the DirectoryInfo class to create a directory listing. This is a great way to quickly list files for users or reports, or to find basic information about a specific directory. When used in combination with FileInfo, you can get all the information you need about fi
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How Do I...Create a log file?
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| Total Hit (1234) |
This sample illustrates how to create a basic log file using the IO classes. This demonstration introduces many useful concepts such as writing to a file, and opening a file, even if the file does not yet exist. Since the information written to the file needs to be shown to the user, this example al
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How Do I...Read and write large files?
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| Total Hit (1388) |
This sample demonstrates how to write a large file and read it back in. This sample also shows how to time such operations. It accepts a file size (measured in kilobytes) from the user, indicating the size of the file to create. The larger the specified size, the longer the process will take to both
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How Do I...Read and write binary data?
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| Total Hit (1656) |
This sample illustrates basic binary file input and output using the BinaryReader, BinaryWriter and FileStream classes. A similar topic is presented under the heading How Do I...Create a log file?. Reading and writing binary information enables you to create and use files that are not accessible thr
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How Do I...Watch file system changes?
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| Total Hit (717) |
Use the FileSystemWatcher component to monitor a file system and react when changes to it occur. This makes it possible for you to quickly and easily launch business processes when certain files or directories are created, modified, or deleted. For example, suppose you and a group of coworkers are c
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How Do I...Create an assembly with a strong name?
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| Total Hit (974) |
Assemblies can be assigned a cryptographic signature, called a strong name, which provides name uniqueness for the assembly and prevents someone from taking over the name of your assembly (name spoofing). If you are deploying an assembly that will be shared among many applications on the same machin
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How Do I...Work with the global assembly cache?
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| Total Hit (1030) |
The global assembly cache is a machine-wide store used to hold assemblies that are intended to be shared by several applications on the machine. The .NET Framework provides two tools for working with the cache. One is a Windows shell extension that allows you to work with the cache using a Graphical
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How Do I...Change the search path for private assemblies?
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| Total Hit (1764) |
Private assemblies are assemblies that are visible to only one application. The .NET Framework enables developers to build applications that are isolated from changes made to the system by other applications. Private assemblies must be deployed in the directory structure of the containing applicatio
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