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I, (1) textbox obtains the focus to clear the text and loses the focus to reply to the text Enter keywords here"Onfocus = "If (this. value = This. defaultvalue) This. value = ''" Onblur = "If (this. value. Replace (// ig,'') = '') This. value =

/// /// download the object /// /// download the object address /// download address // display progress bar Public void downloadfile (string URL, string filename, system. windows. forms. progressbar prog) {try {system. net. httpwebrequest

Now I'm studying design patterns, reference books, and other people's ProgramWrite this data access interface and use the abstract factory mode and simple factory mode. You are welcome to criticize and correct it. Currently, oledb ODBC Oracle

The image control provided by aspdotnet has a simple price comparison, but only a simple display. Compared with the IMG tag of HTML, it has some more functions. Generally, some styles need to be added for image processing, such as the filter effect

When I debugged the WCF Service yesterday, I encountered an exception and the exception information was hard to understand. I have never encountered it before. After a while, I figured out the reason. As usual, creating a WCF library is the kind of

The winform client obtains data through the Web Service (wse3.0 is used and MTOM is enabled) and occasionally receives the following message: "The request failed due to HTTP status 400: Bad request. "Error returned, At the same time, the following

The MVC framework has a very good function, that is, after the form is submitted, the entity can be automatically assigned a value, as long as the attribute name and the HTML element name are the same, it can basically bind and modify Common Object

When using the WCF Service, svcutil is usually used to generate the proxy class and configuration, and the service can be called with the generated default configuration. Let's take a look at the generated default configuration content: View code

The const and readonly keywords are frequently used in interviews. They are usually used to represent an immutable variable member. What is the difference? In terms of usage, const can only use inlineCodeReadonly can be defined in the form of Inline

Recently, formview was used, but it was found that the control in formview could not be obtained by traversing controls, but it could indeed be obtained through findcontrol. there is only one control in the controls of formview. The type is system.

Today, I encountered an incredible bug. Any action in the newly added controller cannot be accessed, and the Error 404 is returned. Generally, this error can be a spelling error or a post attribute is accidentally added to the action. However, no

      I. application background: This kind of requirement often occurs during project creation. For example, if you want to list the professional information of all personnel, you must first list the personnel name and second list the

Recently, when I was working on a web project, I encountered the function of passing parameters across pages, that is, to bring the content of the current page to a new subform. The previous method was to pass an ID, then read the database content

In Visual Studio. NET, a solution can contain multiple projects, and a project can reference several other projects. During compilation, vs automatically determines the compilation sequence of each project. How exactly does vs calculate this order?

Recently, when encapsulating the Excel component, you need to provide two interfaces to access cells based on the unit index and unit name. For example, getcell (1, 2) and getcell ("A2") return the same results. Here is a problem. How do I convert a

Although the title is "dynamic compilation", this article contains two parts: one is the dynamic compilation of the title.Source codeThe other one should be the dynamic generation source.Code. That is to say, in. net, there can be such a

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

After defining a delegate, we can call back a method like mydelegate (3, 7). In fact, every delegate object is a class object, each delegate object has a synchronous member method of invoke (which is known by msdn). The system actually calls

There are a lot of comments and events on the InternetArticleWhich is well written. The following is my understanding of the incident and delegation. If there are any mistakes, please submit them. Thank you very much. To facilitate reading, I

Today, we encountered such an exception. The exception information is as follows:Type: System. InvalidOperationException, mscorlib, Version = 2.0.0.0, Culture = neutral, PublicKeyToken = b77a5c561934e089Message: Error in serialization or