print barcode vb.net Add a catch block to catch any exceptions that may occur in the try block. in Visual C#

Creation Data Matrix in Visual C# Add a catch block to catch any exceptions that may occur in the try block.

Add a catch block to catch any exceptions that may occur in the try block.
Generate Data Matrix In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create Data Matrix 2d barcode image in .NET applications.
www.OnBarcode.com
Data Matrix Decoder In C#.NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Note: Event handlers in Visual Studio .NET tend to use an e parameter for the event parameter to the call. To ensure we avoid a conflict, we will use ex as a standard variable name for an Exception object.
Code 128B Maker In Visual C#
Using Barcode creation for .NET Control to generate, create Code 128A image in .NET applications.
www.OnBarcode.com
Paint UPCA In C#.NET
Using Barcode drawer for VS .NET Control to generate, create UPC Symbol image in VS .NET applications.
www.OnBarcode.com
GETTING STARTED WITH VISUAL STUDIO .NET
PDF 417 Drawer In Visual C#
Using Barcode printer for Visual Studio .NET Control to generate, create PDF 417 image in .NET applications.
www.OnBarcode.com
Data Matrix Encoder In Visual C#.NET
Using Barcode drawer for .NET Control to generate, create DataMatrix image in .NET framework applications.
www.OnBarcode.com
In C#, the catch clause takes an exception class name, and a variable to use in referring to this class. The block is executed if one of the statements in the try block throws this class as an exception. The catch clause can leave this class name out to catch any exception. Here, we catch all Exception class objects, which is generally all exceptions in .NET. For example, the OpenFileDialog.OpenFile method can throw a file I/O exception using the IOException class. Since this class derives from the Exception class, it will be caught by our handler. Other exceptions such as OutOfMemoryException may also occur, and are caught by our block as well.3
Barcode Generator In Visual C#.NET
Using Barcode generator for .NET framework Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Printing USPS Intelligent Mail In C#.NET
Using Barcode generator for .NET Control to generate, create USPS OneCode Solution Barcode image in .NET framework applications.
www.OnBarcode.com
HANDLE EXCEPTIONS IN THE BTNLOAD_CLICK METHOD Action 4 Handle the exception by displaying a message to the user. Note: In this case, we return to the caller without loading an image. Results and Comments One way to do this is as follows:
Data Matrix Creation In VB.NET
Using Barcode maker for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET applications.
www.OnBarcode.com
Data Matrix Decoder In Visual C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
catch (Exception ex) { // Handle exception MessageBox.Show( "Unable to load file: " + ex.Message); }
Recognizing QR Code JIS X 0510 In VS .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Printing EAN-13 Supplement 5 In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create EAN-13 image in .NET framework applications.
www.OnBarcode.com
This code uses a class we have not seen before: the MessageBox class. This class is used to display a simple dialog box. We discuss this class in detail in chapter 8. For now, just copy the code and trust me. The Message property for the ex variable is used in our dialog to insert the message string describing the exception provided by the Exception object. This and other members of the Exception class are summarized in .NET Table 2.1. We will use exceptions throughout the book to handle errors in a similar manner. Other concepts associated with exceptions will be presented as they are required by our sample program. Our MyPhotos application is now in line with our MyForm application from section 1.3, with the slight improvement of handling any exception that occurs while opening the file. Our last task in this chapter is to enable the form to resize gracefully using the Anchor property.
Decode ANSI/AIM Code 128 In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Paint Barcode In .NET
Using Barcode printer for Reporting Service Control to generate, create Barcode image in Reporting Service applications.
www.OnBarcode.com
Resizing forms
Barcode Generation In VS .NET
Using Barcode encoder for VS .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
PDF 417 Decoder In VB.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Our final task in this chapter is to set the behavior for resizing using the Anchor property for our controls, and establish a minimum size for the form so that our PictureBox control does not disappear. This will finish our duplication of the application created in chapter 1. The remainder of this book will use Visual Studio .NET when discussing applications changes, so we will carry the MyPhotos application into chapter 3 and beyond.
Recognizing Code 128C In Visual Studio .NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Encoding Barcode In Objective-C
Using Barcode encoder for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
A more formal discussion of exceptions and the exception handling syntax appears in appendix A.
UPC Code Generator In None
Using Barcode drawer for Microsoft Word Control to generate, create UCC - 12 image in Office Word applications.
www.OnBarcode.com
Printing Barcode In None
Using Barcode maker for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
RESIZING FORMS
Figure 2.6 The application is resized here via the PictureBox.Anchor property.
.NET Table 2.1 Exception class
The Exception class represents a generic exceptional condition, and serves as the base class for all exception classes in .NET. This class is part of the System namespace, and provides information required to raise (throw) and process (catch) exceptions. Note that it is possible for unmanaged code to throw exceptions that will not be seen as Exception objects. These exceptions can be caught using an empty catch clause. HelpLink Gets a link to help information associated with this exception. Gets the inner (nested) exception associated with this object, if any. Gets the message text assigned to the exception. Gets or sets a string containing the source of the exception, such as the name of the application or object that generated the error. Gets the stack trace as a string. By default, the stack is captured just before the exception is thrown. Gets the MethodBase object for the method that threw this exception. Returns the original Exception that caused the current exception to be thrown. Useful when a chain of nested exceptions is received. Sets the string returned by the HelpLink property. Returns the fully qualified name of the exception, and possibly other information such as the message text, the name of the inner exception, and a stack trace.
Copyright © OnBarcode.com . All rights reserved.