Category: Knowledge Base

Get the clicked button of a MessageBox using DialogResult

The MessageBox dialog can contain several buttons: OK, Cancel, Yes, No, Retry and so on. The question is how do you figure out which of the buttons was clicked? If OK was clicked, you want to take a different action than if Cancel was clicked. The solution is to use the DialogResult object: DialogResult dlgResult = MessageBox.Show(“Do you want to continue?”, “Continue?”, MessageBoxButtons.YesNo, MessageBoxIcon.Question);if […]

How to use #ifdef and #ifndef to check if an identifier has been defined

#ifdef, #ifndef and #endif are preprocessor directives which allow us to check wether or not a value has already been defined using the #define directive. This can be useful when you’re including files that may already have the same value defined using #define. Here’s an example that defines the value Whidbey only if it wasn’t defined before: #ifndef Whidbey#define Whidbey#endif Similarly, what’s between #ifdef and #endif is compiled […]

How to convert C++ variables to other data types using casting

There are several ways to convert C++ variables.Here is one method of converting an integer variable to a bool (boolean) variable: int MyInteger = 0;bool MyBool = (bool)MyInteger; And here is another way: int MyInteger = 0;bool MyBool = static_cast<bool>(MyInteger); In both cases, after the casting has been made, MyBool will contain the value false (since MyInteger was 0). If MyInteger was 1 or any other number […]

How to detect if the visitor of a website is running Windows Vista

Different languages have different ways of getting information about the visitors. However, most languages can get the User Agent, which provides us, the webmasters, with information about the visitor’s browser, plugins and operating system. For example if the user agent of a visitor is: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322) Windows […]

How to detect if the visitor of a website is using Internet Explorer 7 Beta 1

Looking at the user agent we get information about the visitors, such as the operating systems they are running, browsers they are using, or what version of .NET Framework they have installed. The user agent is retrieved differently depending on the programming language you are using for your website. Since Internet Explorer 6.0 is the dominant browser, […]

Using EnsureVisible() to scroll down to the bottom of a ListView

You can easily programatically scroll to the bottom of a ListView using the EnsureVisible() method. This method takes 1 parameter – the index of the ListViewItem that you want to ensure visibility for. The trick to keep the ListView scrolled down is to use the EnsureVisible() method every time a new item is added to the list, and pass that item’s index as a parameter. […]

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