Want to know how to create a exception handler if say you have a form that has a foregin key in it, how does one put an exception handler to prevent the operation of this producing a VB.NET Error when i want to delete a record?
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I would like to have a pop up messagebox that asks users for confirmation before deleting a record in datagridview and if the record is a foreign key to another table, another messagebox will appear and warns users saying" before you can delete this record, make sure you remove all the related records" I have tried but I don't know how to complete it.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.StaffTableAdapter.Fill(Me.StaffDBDataSet.Staff)
BindingNavigator1.DeleteItem = Nothing
End Sub
[code]....
While I've previously many years of relational databases and procedural languages, I'm stumbling with Visual Basic. In this problem, the simple situation is that I have two files, parent and child. The primary key of the parent file (Area file) is linked by a relation to one of the two fields that makes up the primary key in the child file (Project file) (unique key is formed from 'area' and 'project'). I have the default table adapters created on both files. I have created two maintenance forms showing one each of the two files in datagrid view format.I can create some records in the Parent (Area) file, but when I try to create a record in the child (Project) file, using one of the valid key values from the Area file, I get the 'ForeignKeyConstraint [relation name] requires the child key values [actual value] to exist in the parent table' which I'm absolutely definitely sure it does.
I haven't done any actual coding for those two maintenance forms, just dragged-and-dropped the files from the data sources screen onto separate forms so it creates the controls itself. But I can't work out, if it already knows the data does exist because I can load it back in to the Area maintence form, why it can't check itself to find out the record does exist. Why does it think the record from the parent record doesn't exist? It does exactly the same thing, whether or not the database is in access or SQL Server Express. I have all the latest updates.
I have master detail form with two datagrids. customer and order detail.I have relationship between customer and order detail on customerid.How do i delete record from order detail when i click delete button to delete record from customer datagrid.Here is the code so far.
Private Sub btndelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndelete.Click
'Me.CustomerTableAdapter.Fill(Me.CustomerDataSet.Customer)
[code]......
I am leaning VB and have created a basic inventory app for work that consist of 4 tables, CurrentInventory, Surplus, Staff and Category. Each of these tables have a corresponding form. My question is with the CurrentInventory and Surplus form/tables. I want a button on the CurrentInventory Form that when clicked the current record would be transferred to the Surplus table and deleted from the CurrentInventory table.I am assuming that I could somehow use the INSERT command to copy the current record to the surplus table but I am not sure how to accomplish this.
View 5 RepliesI have a general question regarding best practices for exception handling. I have a class library that uses structured error handling. The functions in the library generally perform some mathematical calculations and all return a boolean value indicating whether an exception occured or not (i.e. exception occured = true, no exception = false). The actual calculated result in the function is returned as a ByRef parameter.
Anyway the input variables for my calculations are all passed to the funtions as parameters. I perform some basic checks on these inputs (e.g check that an input is not negative etc) as part of the function code. The next stage is where im unsure of the best way to do things. Using the example i just mentioned, if an input parameter is negative, I can either throw an exception such as "ArgumentOutofRange", or i can simply show a messagebox with some info about what happened. Either way i do it the function will return true. At the moment i am throwing an exception, but on reading the "Best practices for exception handling" it is recommended you dont throw an exception for things that can be checked programatically because of "performance/overhead issues".
I'm a little confused by what they mean by this. What kind of overhead are they talking about? Slower program? More disk space required? More memory required? When my functions return true, the calling methods basically drop everything and stop calculations (exit sub), so im not sure that the overhead issues they are talking about are as important to me. It seems easier and neater to throw an exception and utilize some global error strings and pass some parameters rather than copy and paste messagebox.show() all the time, and modify the text to suit the situation. Another argument for me would be that both methods of exception handling utilize a messagebox, which stops code execution until the user does something. So i cant see the issue with the performance overhead.
for the program I am creating I want the computer to check if the configuration file has been created or not. I wrote this function to do that but I don't how to handle a file exception. Here's my code currently but obviously it returns an error if the configuration file doesn't already exist. So how do I add a check for an exception?
Public Function CheckIfRunBefore()
Dim ConfDirectory As String
ConfDirectory = ""
Dim StreamReader As New IO.StreamReader("C:\VRAI\Conf.txt")
[code]....
I am currently working on my Final Project and I need to incorporate some Exception Handling. I have created one in the following code but it isn't working. I don't have any "Errors" or "Warnings" but when I run the program it says the "BadNameException was unhandled." I thought I followed the steps correctly from my book, but I am stuck somewhere. [code]
View 6 RepliesI initially posted this in the wrong forum. I need help getting this to run properly. I'm trying to construct a fractions calculator. In order to complete it, I need to do it like this:Using Select Case statements, four Function procedures should be called based on the operation selected. Each Function procedure will calculate the correct operation and return the Decimal value to the calling procedure. The original procedure will print the result.
Now, the result should be calculated to the hundreths place and the input values should be validated by a Try-Catch Block.And of course, I've been having trouble with how to do this. I've attempted many times and this is what I have so far:
[Code]...
I have been using VB6.0 to create database-driven Apps. With VB6.0, I could Dimi recordsets to read/write data from/into database tables. I could use the read data to validate textbox controls on the Windows Forms. But I when I upgraded VB6.0 Apps to VS 2008, I had problems with PowerPacks not found, Exceptional Errors etc.Most of all the problems I have experienced are:
- Overload Resolution failed because no accessible 'item' accepts this number of arguments.
- Error Code -2146825023
- Exception Snapshot - {"Item cannot be found in the collection corresponding to the requested name or ordinal."}
- Interop Errors[code]
I have converted vb6 code to vb.net but in vb6 I used errorHandler in VB.NET we used "Tyr and catch" block
but In catch block resume next gives an error bcoz it is not valid for vb.net
[Code]...
i did this little bit of Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
I have a form with a DataGridView binding to an Access database. Everything works fine and it populates perfectly. Except when I delete a record. I get the following. I found a few threads about the issue but I cannot resolve the issue. Can some one give me a step by step to resolve this. [Code]
View 4 Repliesi'm having a problem regarding sql deleteCommand..
here's my code
Private Sub btnDeleteBC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDeleteBC.Click
If MessageBox.Show("Do you really want to Delete this Record?", _
[Code].....
I'm using vb.net and I have connected a database to it. As per my interface I should add, delete, go back, go next and save my records. All the buttons work apart from delete. The problem is I do not know the codes for deleting a particular record during the run time, how to work with the codes and steps of deleting a particular record.
View 13 RepliesI can delete record but it only checks for the username.How bout for the password?Can I use
("delete from tblogin where username=('" & txtUsername.Text & "') AND password=('" & txtPassword.Text & "') ", sqlconn)
so that it can also validate the password?
Private Sub btnDeleteuser_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDeleteuser.Click
sqlconn = New SqlConnection("server=CHERRIE-PC;Database=yss;integrated
[Code].....
Currently to check if a file is in use (before attempting to move or send it by FTP etc) we try and open it with exclusive right and trap the System.IO.IOException that would occur if anotehr process is reading or writing the file.
However - how can we do this without the bad paractice of using an exception handler for unexceptional process flow?
Good, detailed resources or books for best-practices on exception handling? I am looking to dive into a much deeper understanding of it, and am finding it hard. All the books I see over .NET, ASP.NET, etc. place little emphasis or detail on exception handling.
I am currently testing out a 3-tier ASP.NET application, with a presentation layer, business logic layer, and data layer, and want to know more about exactly when to throw errors, when to catch them, what layer to do them in, etc.
I don't want a simple google search on ".NET exception handling" and then having you post the first couple of links. I would like you to respond if you have quality, known resources that you have used or have found.
I use the following code to access a VSS item:
Dim sItem As String = "$/MyVssProject/InexistentFile.txt"
Dim oItem As SourceSafeTypeLib.VSSItem = Nothing
Try
[Code]....
The problem I face is when I try to get an instance to a file that doesn't exist in the VSSDB, thus leading to a COMException, which basically wouldn't be of a problem (I would expect). In fact the exception occurs, but instead of proceeding with the catch code, the debug cursor stays on the line "oItem = m_oSourceSafe.VSSItem(sItem)", showing a dialog with title "COMException crossed a native/managed boundary.
From here the execution doesn't proceed, until I change the content of sItem to an existing file.
Why does the exception not get caught, and how can I achieve it?
Environment: VS2010 with .Net 2.0 on WinXP SP3 x86
Im using (virtually) the same code in two different projects, in the first, much older, program the code works well and had done for years. In the second the same code produces and Exception error.
QuoteUnauthorizedAccessException was unhanded.
Access to the path ˜C:/Jotto 1.gtc is denied.
Troubleshooting tips:
Make sure you have sufficient privileges to access this resource. If you are attempting to access a file, make sure it is not ReadOnly.
Actions:
View Detail...
Copy exception detail to the clipboard
The detail copied to clipboard says: -
CODE:
Which sadly means very little to me and I cant make head nor tail of what the Help, says... The only difference between the two codes is that in the first, working, project the file I wish to delete is named specifically whereas in the second, its named as a variable.
CODE:
The code runs ok up to the second of these lines, so the filepath has been verified. Have I perhaps missed something earlier in the code? some preconditioning perhaps ?
What 3rd party software is out there for exception handling for VB.net code?
View 4 RepliesHow do i go about creating an exception handler when i want to login to my form to access the rest of my forms. The username and password are linked to server.What if it doesnt connect to server? here is coding for me to login:
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
If (txtUName.Text = "-") Or (txtUName.Text = "0") Or (txtUName.Text = "") Or
[Code]....
I'm having errors when I try to forcibly close a socket program. I don't know what is the right exception to use.
View 1 RepliesI have written a MDI Text Editor and I have written sub routines for print preview, cut, copy and so on, when testing my program, I click print preview when there are no documents active and the program crashes, the same happens with cut, copy, paste.
I know this is because I have not handled any error exceptions, the truth is im not sure how to.
I have got the code that makes print preview work with my mdi documents, but what code can I use or how can I add it to my existing sub routines to possibly show a message box saying something like "This Function Cannot Be Used With No Active Documents" something like that.
Could I use an If Statement? or Try, Catch, Block? - I am using a different computer as I am currently at work but if anyone needs the code I currently have for my sub routines.
I'm working on a project for school in which a dll is loaded.
The dll that is loaded is a bridge between my program and the Twincat System Manager which forms the bridge between the computer and a PLC via the local network.
I need to read Variables trough this whole chain from the plc to my program.
This is the way I do this:
Public Function adsReadReal(ByVal Variabelenaam As String) As Single
Dim ds = New TwinCAT.Ads.AdsStream(4 * 8) ' new data stream
Dim br = New System.IO.BinaryReader(ds) 'new binary
[Code]....
We generally have main block to start the program or application first form.I wrote some code in main and it is within try can catch block.Catch block the errors. This try catch block is a global try catch for my whole application.Now if exception occur in the code will be handled in this catch. But Is there any good way to handle the exception in the catch block if occur?as I write error in log file but sometimes file can have permissions for writing etc and it can create exception.As this try catch is the outer most try catch block and if any error occur in that catch it will cause application to crash.
View 8 RepliesI already read a lot about exception handling and saw many different threads on the subject but still confused when creating class libraries like the following scenario.
Lets say i have a class library "MyClass.dll", inside the project i have two classes:
Skeleton.vb
Imports System.IO
Public Class Skeleton
Public Function Create(ByVal resourceName As String) As String
[Code].....
I'm writing a CPU emulator in VB .NET.It's important to keep the code tight for maximum performance.
The following test code shows an example of my issue[code]...
Now I know I can use a long, and mask the value with &HFFFF, and I know I can add exception handling to the code. but remember, this is an emulator and more code = less performance.
Anyone out there who happens to have an exhaustive code snippet for SEH (including all possible exceptions) for VS 2008 or VS 2010 (.NET 3.5 or 4.0) ?
View 10 RepliesI have an unhandled exception event in the ApplicationEvents area of my program, but it never gets called when I do get unhandled exceptions. Is there a trick to making this work?
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