On Error Goto Visual Basic 2008
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error-free program can run smoothly and efficiently, otherwise all sorts of problems occur such as program crash or system hang. Errors often occur due to incorrect input from the user. For example, the user might make the mistake of attempting to
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enter a text (string) to a box that is designed to handle only numeric values vba error number such as the weight of a person, the computer will not be able to perform arithmetic calculation for text therefore will create an error. try catch vba These errors are known as synchronous errors. Therefore a good programmer should be more alert to the parts of program that could trigger errors and should write errors handling code to help the user in managing the errors. https://msdn.microsoft.com/en-us/library/ms973849.aspx Writing errors handling code should be considered a good practice for Visual Basic programmers, so do try to finish a program fast by omitting the errors handling code. However, there should not be too many errors handling code in the program as it create problems for the programmer to maintain and troubleshoot the program later. Visual Basic 2008 has improved a lot in built-in errors handling compared to Visual Basic 6. For example, when the user attempts http://www.vbtutor.net/vb2008/vb2008_lesson20.html to divide a number by zero, Vb2008 will not return an error message but gives the 'infinity' as the answer (although this is mathematically incorrect, because it should be undefined) 20.2 Using On Error GoTo Syantax Visual Basic 2008 still supports the VB6 errors handling syntax, that is the On Error GoTo program_label structure. Although it has a more advanced error handling method, we shall deal with that later.We shall now learn how to write errors handling code in VB2008. The syntax for errors handling is On Error GoTo program_label where program_label is the section of code that is designed by the programmer to handle the error committed by the user. Once an error is detected, the program will jump to the program_label section for error handling.
Example 20.1: Division by Zero In this example, we will deal with the error of entering non-numeric data into the textboxes that suppose to hold numeric values. The program_label here is error_hanldler. when the user enter a non-numeric values into the textboxes, the error message will display the the text"One of the entries is not a number! Try again!". If no error occur, it will display the correct answer. Try it out yourself. The Code Public Class> Form1 Private Sub CmdCalculate_Click(ByVal As System.Object,ByVal e As System.EventArgs) Handles CmdCalculate.Click Lbl_ErrorMsg.Visible = False Dim firstNum, secondNum As Double On Error GoTo error_handler firstNum =Txt_FirstNumber.TexΕπιλέξτε τη γλώσσα σας. Κλείσιμο Μάθετε περισσότερα View this message in English Το YouTube εμφανίζεται στα Ελληνικά. Μπορείτε να αλλάξετε αυτή την προτίμηση παρακάτω. Learn more You're viewing https://www.youtube.com/watch?v=iMMwmU8pQuM YouTube in Greek. You can change this preference below. Κλείσιμο Ναι, θέλω να τη κρατήσω Αναίρεση Κλείσιμο Αυτό το βίντεο δεν είναι διαθέσιμο. Ουρά παρακολούθησηςΟυράΟυρά παρακολούθησηςΟυρά Κατάργηση όλωνΑποσύνδεση Φόρτωση... Ουρά παρακολούθησης Ουρά __count__/__total__ Visual Basic 2008 - Error Handling Environmentalnerd ΕγγραφήΕγγραφήκατεΚατάργηση on error εγγραφής2.3482 χιλ. Φόρτωση... Φόρτωση... Σε λειτουργία... Προσθήκη σε... Θέλετε να το δείτε ξανά αργότερα; Συνδεθείτε για να προσθέσετε το βίντεο σε playlist. Σύνδεση Κοινή χρήση Περισσότερα Αναφορά Θέλετε να αναφέρετε το βίντεο; Συνδεθείτε για να αναφέρετε ακατάλληλο περιεχόμενο. Σύνδεση Μεταγραφή Στατιστικά στοιχεία 12.815 on error goto προβολές 33 Σας αρέσει αυτό το βίντεο; Συνδεθείτε για να μετρήσει η άποψή σας. Σύνδεση 34 2 Δεν σας αρέσει αυτό το βίντεο; Συνδεθείτε για να μετρήσει η άποψή σας. Σύνδεση 3 Φόρτωση... Φόρτωση... Μεταγραφή Δεν ήταν δυνατή η φόρτωση της διαδραστικής μεταγραφής. Φόρτωση... Φόρτωση... Η δυνατότητα αξιολόγησης είναι διαθέσιμη όταν το βίντεο είναι ενοικιασμένο. Αυτή η λειτουργία δεν είναι διαθέσιμη αυτήν τη στιγμή. Δοκιμάστε ξανά αργότερα. Ανέβηκε στις 17 Δεκ 2008Error Handling In Visual Basic 2008. Just a simple tutorial to help Software Designers with one of there biggest problems 'Unhandled Exception' so in this video i will show you a 'Unhandled Exception' and how to solve this problem.the 2 ways are:TrystatementsCatch ex As Exceptionstatements to deal with exceptionsEnd TryOROn Error Goto Error_Handl