C#

1. Explanation of DBNull:This class is used to indicate that no known value exists (usually in database applications ).In database applications, empty objects are valid values of fields. This class distinguishes between null values (empty objects)

Project architecture: All functions in the system are implemented separately in each dll. The main program loads the corresponding dll of each menu. For some highly repetitive functional code, you can write it in a main dll for other functions to

Reflection is a kind of late binding. It can be used by developers to design code with more flexibility, the cost is to spend more system resource overhead so that the application can obtain unknown information at runtime. To put it bluntly, when

Make an input interface today. There is a need to select a different one based on a DropDownList. Different Input interfaces are displayed in the following sections. If you place the RESPONSE event on the server, you must frequently click the page.

Recently, serial communication programming is involved in the project. When my teammates are working on this module, they encounter a problem that many people may encounter, that is, receiving data conflicts or loss. It took nearly two hours for my

Public static string Intercept (string input, int p) {Encoding encode = Encoding. getEncoding ("gb2312"); byte [] byteArr = encode. getBytes (input); if (byteArr. length Int m = 0, n = 0; foreach (byte B in byteArr) {if (n> = p) break; if (B> 127) m

Preface In the past, on Microsoft's platform, a website was constructed, which requires the close combination of traditional database processing code, business logic layer code, front-end page processing, and interactive program processing, it can

System. linq. the Enumerable class provides many extension methods. Generally, the type of the IEnumerable interface can be extended. For example, the OrderBy method is defined in the Enumerable class, this method is used to sort the sequence of

Use of The ListBox control: 1) control properties Items SelectedItems SelectioModes 2) Data Binding DataSoure DisplayMember ValueMenber 3) instance The following describes the use of The ListBox control. First, let's talk about the properties of the

One advantage of a strongly-named assembly is tamper-proofing. Assume that I have an Assembly named MyDll. dll. If I use my own private key for signature and hash the content in the Assembly, if others do not know my private key, you cannot tamper

Public class LogManager{Private static string logPath = string. Empty;/// /// Folder for saving logs/// Public static string LogPath{Get{If (logPath = string. Empty){If (System. Web. HttpContext. Current = null)// Windows Forms ApplicationLogPath =

In the following code, adding a text watermark and an image watermark cannot coexist (the following is written together for ease of display) Private void Btn_Upload_Click (object sender, System. EventArgs e){If (UploadFile. PostedFile. FileName.

1. What is WMI?WMI is short for Windows Management Instrumentation. Its function is mainly to access some information and services on the local host and manage remote computers (of course, you must have sufficient permissions ), for example, restart,

Implementation in this article: 1. At the cost of space, it is convenient to quickly obtain the mnemonic code of Chinese characters. 2. For the pinyin character, enable multi-Tone Words and provide an explicit method for calling surnames. There are

Author: 1.1 drops of Beer personal homepage: http://beer.cnblogs.com Sina Weibo seems to be gaining momentum now. Many people start to follow many people out of curiosity when they create their own microblogs. Over time, after over 100 friends, then

Public class QueueManage{////// Send the object to the queue////// Queue name, because the queue name should not be changed in an application, it is best to write it in the configuration file./// The object to be sent outPublic static void SendQueue

To become a master of the ocean, you must know the real name of every drop of water in the sea. At the beginning, I just wanted to find a method to convert the JSON array. The result was displayed in the dig command on MSDN. A lot of terms are

Use @ to define a string to indicate the character following the compilation as a string For example: string str = @ "C: WindowsExplorer.exe" the system automatically changes the string to "C: \ Windows \ xplorer.exe" during compilation" Equivalent

  The introduction of Linq in C #3.0 makes a profound change in the control of collections. The hero behind this change is the extension method and anonymous type. Here we will talk about anonymous and implicit type variables in C. I,Anonymous

CodeFile = "ClientCallback. aspx. cs" Inherits = "ClientCallback" %> 1.1 // EN "" http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd "> Client Callback Example Look Up Stock Items in stock: Using System;