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A UIExtensionSite is a user interface element of the shell (the containing window) for a composite application. This article and the next will discuss one of the CAB user interface classes, the UIExtensionSite.

#Use module to put menustrip on each form visual basic series#

So far this series of articles has not really discussed user interfaces at all, and certainly hasn’t covered any of the user interface elements of the CAB.

The CAB introduces a number of new classes to aid in the design and implementation of such user interfaces. However, when we think of a ‘smart client’ we usually think of a well-designed and powerful user interface. We’ve also seen that the CAB has a number of other features to make development easier in general, in particular a dependency injection framework. Sub division(ByVal n1 As Integer, ByVal n2 As Integer)Ĭonsole.Part 12 of this series of articles went into some detail on events in the Composite Application Block, and concluded our discussions of commands and events.Īs we’ve already discussed in this series of articles, the Composite Application Block (CAB) is intended as a means of creating smart client applications that are composed of several independent ‘modules’. Lets now learn to handle these exceptions in VB.Net with example Examples #1īelow is the program for DivideByZeroException and its output say the user needs to enter 5 but inputs say ‘y’ then this exception will occur.

System.FormatException: This exception handles the errors caused when the user inputs a character or a string when asked for a number or integer.

System.DivideByZeroException: This exception handles the errors caused when a number is divided by zero which is against the universal rule that a number being divided by zero will result in an abnormal termination of the program.

System.IndexOutOfRangeException: This exception handles the errors caused by an array index which is out of range.s Suppose we have an array of 5 array lengths and we loop this 6 times the 6th time the program will through IndexOutOfRangeException.

Let us have a look at few VB.NET Exception Classes and its usage. It throws a user-defined exception which is derived from this System.ApplicationException class. System.ApplicationException is a class that executes the exceptions defined by the programmer or developer withing the application.

System.SystemException is a class for all built-in system exceptions or we can say that when running time error when occurred the system exception classes like DivideByZeroException, IndexOutOfRangeException, StackOverflowException is instantiated. The parent class from where these classes are inherited is System.Exception. Exceptions are of different types and these are nothing but classes. Exception Classes in VB.NETĪs already mentioned in the above statement. And thus we have written more than one catch statement in the syntax above. It may happen that more than one exception being thrown by the try block and only one catch block is available, then to catch all the exceptions we will need one or multiple catch statements. Here, there is more than one catch block displayed in the above syntax to catch a different type of exceptions raised by the try block.

#Use module to put menustrip on each form visual basic code#

The code for Try-Catch Block is as per the following This exception may be build in or user-defined exception.

Throw: When an issue occurs this statement throws an exception.

Thus the final block has always statements like closing the files, closing the database connection, the closing of program, etc. In the try block, statements are like open a file, read a file and write a file that may or may not throw an exception but the file needs to be closed before the program ends. Suppose I have to open a file, read the file, write the file and close the file.

Finally: A Finally Block is a block of code that contains statements that are mandatory statements to be executed irrespective of whether the exception is thrown or not thrown.

The catch block is mainly the handling of exception by different Exception Classes defined in the library of Exceptions.

Catch: A Catch Block is a block of code that contains the statements which handle the exceptions by using an exception handler on the statement where the issue occurred.

Thus the try block is always followed by one or more catch blocks. To handle these exceptions thrown in the try block we use catch block.

Try: A Try Block is a block of code which generates different exceptions within the application.

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