variables constants and calculations in visual basic

... object • Short –sht • Integer –int • Long –lng • Single –sng • Double –dbl 1 Chapter 3 Variables, Constants and Calculations Programming In C Shap ©2009 3-2 Variables & Constants • Variable – ... Level Variables Block Level Variables ©2009 3-18 Calculations • Calculations can be performed using properties of certain objects, variables, constants, and numeric literals • Do Not use Strings ... EventArgs e) { int intSoA, intSoB; Double dblKetQua; try { intSoA = int.Parse(txtA.Text); intSoB = Convert.ToInt32(txtB.Text); dblKetQua = intSoA + intSoB; lblKQ.Text = dblKetQua.ToString(); } catch...

Ngày tải lên: 13/05/2014, 11:31

... define two methods: save and delete. (The retrieve method will be defined in a subsequent section.) Add the save and delete methods to your interface, as in Listing 9.7. Listing 9.7 CustomerInterface9_1.vb: ... 3. Finally, add a ToString method to output all the data of the class in a string. This is extraordinarily useful for debugging. Your finished interface should look like Listing 9.8. Listing ... by limiting the class to properties representing the columns in the Customers table and to methods that insert, delete, and update data. Technique Visual Basic .NET has a specific kind of...

Ngày tải lên: 07/11/2013, 15:15

... original Visual Basic for DOS and Visual Basic For Windows were introduced in 1991. • Visual Basic 3.0 (a vast improvement over previous versions) was released in 1993. • Visual Basic ... Workgroups, Windows NT, or Windows 95 • Applications built using the 32 bit version of Visual Basic 4.0, Visual Basic 5.0 and Visual Basic 6.0 will only run with Windows 95 or Windows NT (Version ... 10-14 Using the Windows Clipboard 10-17 Printing with Visual Basic 10-18 Multiple Form Visual Basic Applications 10-21 Visual Basic Multiple Document Interface (MDI) 10-25 Creating a Help...

Ngày tải lên: 24/02/2014, 11:20

... engineering and design using Visual Basic Numerical methods in linear algebra Gauss elimination [6] In this method unknowns are eliminated by combining equations such that the n equations and ... trademarks, and are used only for identification and explanation without intent to infringe. Library of Congress Cataloging -in- Publication Data Datta, Arun. Process engineering and design using Visual BASIC ... 27, 2007 11:16 AM xvi Process engineering and design using Visual Basic PRV isolation valves 268 Inlet piping to PRVs 270 Discharge piping from PRVs 271 Contingency quantification 272 General...

Ngày tải lên: 01/04/2014, 10:57

... library includes a generic collection class for storing data. The class includes two methods and two properties for adding, remov- ing, retrieving, and determining the number of items in the collection. ... Integer, _ ByVal sValue As Integer) As Integer Dim index As Integer For index=0Toarr.GetUpperBound(0) If (arr(index) = sValue) Then Return index End If Next Return -1 End Function The following ... CArray(numItems) Dim index As Integer For index=0TonumItems P1: KSF/ICD 0521547652pre CB820-McMillan-v1 April 21, 2005 16:14 DATA STRUCTURES AND ALGORITHMS USING VISUAL BASIC .NET This is the first Visual Basic. NET...

Ngày tải lên: 17/04/2014, 09:15

... of the other books in this series, this book is about designing and developing great applications for Visual Basic using object- oriented principles. However, today’s Visual Basic developer is ... parts. And since Visual Basic is now a fully object-oriented programming language, using an object-oriented approach to thinking about your appli - cation makes it easier to map these thoughts into ... make it easier and more natural to work with string variables. Understanding how to create an object and call its properties and methods is crucial to any development with Visual Basic. Chapter...

Ngày tải lên: 01/06/2014, 01:21

... strings, such as concatenation, returning substrings, inserting characters, removing characters, and so forth. We examine the String class in Chapter 8. VB.NET strings are immutable, meaning ... salary (an integer), and identification number (a string, or an integer), as well as other attributes. Since storing each of these data values in separate variables could becoming confusing very ... within the same method definition. This is accomplished by utilizing a Get clause and a Set clause. Here are the property methods for getting and setting x-coordinate and y-coordinate values in...

Ngày tải lên: 27/06/2014, 11:20

... 814 WebPartZone controls, dragging and dropping in, 817 XAML, viewing and editing in, 1612–1617 XHTML in, 1571–1573 XML Web service. See XML Web Services, building zone layouts, 817 Visual Studio Conversion ... from, 1189–1190 using external style sheets in, 864–865 using inline styles in, 866 using internal style sheets in, 865–866 Web Parts allowing user to change mode of page, 820–833 creating custom, ... 1425 in DetailsView control, 349–350 handling errors in GridView control during, 337–339 IIS 7 dependencies and, 565 LINQ to SQL, 493 in SQL Server, 381–382 using AJAX on Web page, 897 using pkmgr.exe to...

Ngày tải lên: 05/07/2014, 18:20

... Grouping 472 Other LINQ Operators 473 LINQ Joins 473 Paging Using LINQ 475 LINQ to XML 476 Joining XML Data 479 LINQ to SQL 481 Insert, Update, and Delete Queries through LINQ 490 Extending LINQ ... Working with XML and LINQ to XML 497 The Basics of XML 498 The XML InfoSet 500 XSD–XML Schema Definition 501 Editing XML and XML Schema in Visual Studio 2008 503 XmlReader and XmlWriter 506 Using ... ListBox, RadioButtonList, and CheckBoxList 365 TreeView 366 Ad Rotator 366 Menu 367 Inline Data-Binding Syntax 367 Data-Binding Syntax Changes 368 XML Data Binding 369 Expressions and Expression Builders...

Ngày tải lên: 05/07/2014, 18:20

... Rendering 1210 Adding Tag Attributes 1214 Styling HTML 1217 Themes and Skins 1220 Adding Client-Side Features 1222 Detecting and Reacting to Browser Capabilities 1231 Using ViewState 1234 Raising ... applications using mainly Visual Basic (VB). Visual Basic was not only a programming language; it was tied to an IDE that allowed for easy thick-client application development. In the Visual Basic model, ... 1607 Step 1: A Basic ASP.NET Application 1609 Finding Vector-Based Content 1610 Converting Vector Content to XAML 1611 Tools for Viewing and Editing XAML 1614 Integrating with Your Existing ASP.NET...

Ngày tải lên: 05/07/2014, 18:20

... snap -in when using Windows XP, or the new IIS interface if you are using Windows Vista) use the WebConfigurationManager class that is also available for building custom administration tools. Listing ... 5:02pm Page xlii Introduction Expanding on the Page Framework ASP.NET pages can be built based upon visual inheritance. This was possible in the Windows Forms world, but it is something that is relatively ... event informa- tion in a SQL Express file contained within the application. This change can be made by adding a < healthMonitoring > node to your web.config file as presented in Listing I-5. xxxix Evjen...

Ngày tải lên: 05/07/2014, 18:20

... ASP.NET, be sure to check out Beginning ASP.NET 3.5: In C# and VB by Imar Spaanjaars (Wiley Publishing, Inc., 2008) to help you understand the basics. In addition to working with Web technologies, ... that you understand basic programming constructs, such as variables, For Each loops, and object-oriented programming. You may also be wondering whether this book is for the Visual Basic developer ... require and shows you how to create a centrally managed look -and- feel for all the pages of your application by using themes and the skin files that are part of a theme. ❑ Chapters 7, ‘‘Data Binding in...

Ngày tải lên: 05/07/2014, 18:20

... having everything in a single viewable instance makes working with the ASP.NET page easier. Another great thing is that Visual Studio 2008 provides IntelliSense when working with the inline coding ... pages inline. In fact, many page types have options for both inline and code-behind styles. The following table shows your inline options when selecting files from this dialog. File Options Using Inline ... the examples in this book use an inline coding model because it works well in showing an example in one listing. Even though the example is using an inline coding style, it is my recommendation...

Ngày tải lên: 05/07/2014, 18:20

... Class C# using System; using System.Data; using System.Configuration; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using ... the code-behind model or the inline coding model. Basically, these directives are commands that the compiler uses when the page is compiled. Directives are simple to incorporate into your pages. ... the language used for any inline rendering and script blocks. LinePragmas Boolean value that specifies whether line pragmas are used with the resulting assembly. Src Points to the source file of...

Ngày tải lên: 05/07/2014, 18:20

... page from which any cross-page postings originate. Cross-page posting between ASP.NET pages is explained later in the section ‘‘Cross-Page Posting’’ and again in Chapter 17. The @PreviousPageType directive ... Request.QueryString["ThemeChange"]; } < /script > If you create an ASP.NET 3.5 page and turn on tracing, you can see the order in which the main page events are initiated. They are fired in ... you simply create an instance of that control type and populate this instance using the FindControl() method from the PreviousPage property. The String value assigned to the FindControl() method...

Ngày tải lên: 05/07/2014, 18:20

Ngày tải lên: 05/07/2014, 18:20

Ngày tải lên: 05/07/2014, 18:20

Ngày tải lên: 05/07/2014, 18:20

Ngày tải lên: 05/07/2014, 18:20

Ngày tải lên: 05/07/2014, 18:20