Catching SQL Exception - Put Data In A Field That Doesn't Matched What Is On The Other Table
Nov 9, 2009
What is going on with my code. To .NET and handling SQL connections. I am trying to catch an error where lets say someone puts in something that violates the rules of the field (i.e. they put data in a field that doesn't matched what is on the other table.) Please find teh code I ahve put on the save button to try to catch the error. Instead of popping a message box up the program just closes itself.
Private Sub Job_tableBindingNavigatorSaveItem_Click_2(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Job_tableBindingNavigatorSaveItem.Click
Try
So I have a program that I am converting to .NET FW 3.5 and I am getting the titled exception on the following line:If IsNothing(dsTopPI.Rows.Find(profile.Item("GEMSID"))) Then Continue For
which is in a for each loop. The thing is, I have set the primary key and when I put in the following code:Dim columns() = DSTop30Profiles1.DTtop30profiles.PrimaryKey Console.WriteLine("Column count: " & columns.Length.ToString)For a = 0 To columns.GetUpperBound(0)Console.WriteLine(columns(a).ColumnName & " - " & columns(a).DataType.ToString)Next
I get this in the output:Column count: 1 GEMSID - System.Int32
That would seem to indicate that there is in fact a primary key, right?
When catching an exception in .net, you can have as many type-specific exception blocks as needed. But I usually try to have at least one "general" exception catch block. But is there a way to get the type of the "real" exception thrown that is caught by the generic exception handler, perhaps using reflection?For example, if I have
Catch ex As System.ServiceModel.FaultException(Of InvalidUser) ProcessModuleLoadException(Me, ex) Catch ex As System.ServiceModel.FaultException(Of SQLExceptions)
I am building a data based application using VB 2008 an SQL Express. I need to create textboxes on my form using code, (With & End With) method. I need a simple code string that will allow the app to check if the field to wich the textbox wil be databound is Nul, If so the textbox will not be created.
I currently have this working already for one of my combo box's, but when i try to use the same code i get this error ''There is no row at position 6.'' . The are 2 fields in the table asset_type_id, asset_type_name', im trying to dispaly the values in a combo box for the field 'asset_type_name.
the code for ' Friend Sub RetrieveCustomerInformation2()' works but the other friend sub throws the error. Imports System.Data.SqlClient Imports System.Data Imports System Imports System.Data.OleDb
I am trying to catch an exception but occasionally get an inner exception. I want to output both into a label. I often get Object reference not set to instance of an object if there is no inner exception.
Catch ex As Exception exError = ex.Message.ToString If Not ex.InnerException.Message Is Nothing Then
I am creating a database in VB.NET for a movie rental place. I currently have three forms;
Member Information DVD Information Borrow DVDs
What I would like to do is when I am viewing a member's details, if I click a button 'Borrow DVD for Member', the member's ID number transfers over to the Borrow DVDs table in the Member ID which also would hold some information from the DVD Information table, but I'm sure if i can figure out how to do this firstly, I will be able to apply the same rule and work it out myself.I have been trying to use a query statement like;
INSERT INTO [Borrow DVDs].[Member ID] [IN goodstuffvideos.mdb] SELECT [Member Information].[Member ID] FROM [Member Information]
but that has been coming up with error codes and completely not working.
Borrow DVDs table fields are: Borrow ID, Member ID, DVD ID Number, Hiring Fee, Borrowing Limit?
DVD Information table fields are: DVD ID Number, Title, Rating, Hiring Fee, Borrowing Limit Member?
Information table fields are: Member ID, Family Name, Given Name, Address, Town/Suburb, Postcode?
The error coming up is; Error in INSERT statement. Unable to parse query text.And under that it says The query cannot be represented graphically in the Diagram and Criteria Pane.
I have a method as follows: Public Sub Send() Dim caughtException As Exception = Nothing Try //Attempt action. Catch ex As Exception //Custom exceptions which can be thrown all inherit from Exception. //Instantiate error object to be logged. caughtException = ex End Try //Log action and if there is an error log this too. If caughtException IsNot Nothing Then Throw caughtException End Sub
It is essential that I log the error for reports, which after research, rethrowing the exception is the right thing to do. What I am concerned about is preservation of stack information. In order to keep the code DRY I am logging the action in one place - after the exception has been caught. This functionality is ultimately exposed via WCF.
I want to make some exception catching code a little cleaner, if possible.I currently have the below:
Catch ex As System.Exception If ex.Message.Contains("opened exclusively by another user") And errCnt < 30 Then sender.ReportProgress(0, "Waiting for database to become available")
I use Visual Studio 2003, VB.net, NetFramework 1.4 and Windows XP I have been using the following Code Snippet for a number of years in both Web Services and Windows Applications. However suddenly around the 29th September 2010 it has stopped sending E-Mails from both Web Services and Windows Applications. The same problem has happened not only to my own Network but on two other Networks, one using XP as its Server and the other using Server 2003. All 3 of these are using different ISPs.
How can I call my TextBox ID = "txtFromAddress" data to a table that I am trying to send? Right now it is just showing the text '& txtFromAddress' on the table on the email that I send.
It seems like when there is only one row at the data grid view with a data source pointing to a data table, it's row state for the data table doesn't change when editing. It remained "unchanged" reguardless to how many columns I had entered. However,after editing, when you click on a different row or click on any of the column headers to change their sorting, the row's state from the data table then gets changed to "modified". I'm not sure why the data table's row states gets changed only when you do those things instead of finishing editing itself. Couldn't the data grid view be able to change the data table's row states when you finished editing a cell?
I am trying to match between two datasets. Based on some predefined criteria the matched items are stored into a datatable. I am using the code below: [code]I am not sure whether there are more effective way to store the matched items in a new datatable since the method I used here requires three loops which is a lot of processing time.
How can use vb.net forms to add or delete quantity in a field og ms sql data table.. EG: like in stock, we hv to add purchased stock and deduct selled stock.
I am trying to bind data from a text box on my form to a field in my database table. First of all I have created a DataSet, BindingSource and Table Adapter in the forms Design view, but I am having from there. Under the properties of each text box I have set the DataBindings (Text) to the field in the table under the forms instance and DataSet rather than the Projects Data Sources. I am very rusty at Visual Studio 2005 and that is all I have to work with.
Im pretty use to doing loops (although still relative new to vb) in my code however am having difficulty setting up one that picks up an entry in one data table and then sums a field in another where records have matching criteria. Example:
[Code]...
What i am trying to do is set up a datagridview on a form that shows the summary data. The time is controlled on the form by a trackbar (output to textbox) and I started setting up a loop using (For/Next) to isolate firstly the matching entries in field 3 (time). This works fine. I then used compute to sum the the field 2. However what i want to do is to loop through table 2 and where entries match i.e. where Field 1 in table 2="A" sum matching entries in table 1 where the DateTime matches.
How to check if string entered in a text box matches a field in a data table
I have a form with two text boxes for users to enter their Username and Password. When they enter their details and click the 'Login' button I want their details to be
checked against data in a data table to see if they match or not. I am using an 'if...else' statement but can't work out the syntax to use. My code is as follows[code]...Check when string entered in a text box matches field in data table?
How to check if string entered in a text box matches a field in a data table.I have a form with two text boxes for users to enter their Username and Password. When they enter their details and click the 'Login' button I want their details to be checked against data in a data table to see if they match or not. I am using an 'if...else' statement but can't work out the syntax to use. My code is as follows:[code]The fields I want to match the textbox strings against in my database table are called 'Username' and 'Password'.
I have a query that I have to run that requires me to get rows from a table based on the value of a field in another table (which I have gotten earlier). I currently have it done like this (simplified).
I'm trying to query LDAP using a field that contain's 's in VBScript, but I can't get it to work. Here is my code (basically). What am I doing wrong?objCommand.CommandText = _
"SELECT cn FROM 'LDAP://" & x & "' WHERE extensionAttribute1 = '1500 0FFEA14C439' "This string will never match any record even if use wild cards or copy in the exact data from the AD record.
I have a field on my form for Check Number if a bill was paid by check, if not it should be blank. When I run the query in Access it returns the right records.the query loads all current customers, 99 out of a possible 107, when I navigate through the records as soon as I hit one where a Check was used, the Check Number field stays filled in for all records displayed after.
vb.net If Not dsForm.Tables(0).Rows(dbCursor).Item(1) Is DBNull.Value Then Me.txtRentalID.Text = CStr(dsForm.Tables(0).Rows(dbCursor).Item(1)) Me.intRentalID = CInt(Me.txtRentalID.Text.Trim.ToString)
Mine is a simple conexion problem but I dont understands what's happening I have another form in the same project which has no problems at all, I desided to create a form to use it as a base form named plantillav only to duplicate forms and intance the others from that one I put it's Modifiers Property = Protected in ortder to modify property values in the other ones I don't know if the process generated a failure.
I created the following strconn:
Public
Class clientesc
[CODE]...
This table was exported from phpmyadmin (wamp) so it means is created and even with registers inserted directly from console, the problem is when I send from the application, with the following error that indicates that the name of the field doesn't exist or is not well written; Unknown column 'code_empleado' in 'field list'.
Note: this is not a duplicate of Jeff's question. That question asked "Is an equivalent?" I know there isn't, and I want to know why! The reason I ask is that I've only just become clear on how important it is, and the conclusion seems very strange to me. The Exception Handling block of Microsoft's Enterprise Library advises us to use this pattern:
[Code]...
The policy is defined in an XML file, so that means that if a customer has an issue, we can modify the policy to assist with tracking down (or perhaps papering over) the problem to give them a fast resolution until we deal with it properly - which may involve arguing with 3rd parties, about whose fault it all is. This is basically an acknowledgement of the simple fact that in real applications the number of exception types and their "recoverability" status is practically impossible to manage without a facility like this.
Meanwhile, the CLR team at MS says this is not an option, and it turns out those guys know what they're talking about! The problem is that right before the catch block runs, any finally blocks nested inside the try block will be executed. So those finally blocks may do any of the following: Harmlessly modify the program state (phew, lucky). Trash something important in the customer's data, because the program state is screwed up to an unknown degree. Disguise or destroy important evidence that we need to diagnose an issue - especially if we're talking about calls into native code. Throw another exception, adding to the general confusion and misery.
Note that the using statement and C++/CLI destructors are built on try/finally, so they're affected too. So clearly the catch/throw pattern for filtering exceptions is no good. What is actually needed is a way to filter exceptions, via a policy, without actually catching them and so triggering the execution of finally blocks, unless we find a policy that tells us the exception is safe to recover from. The CLR team blogged about this recently:
Usually when I get an exception, the code line that creates it is marked yellow etc.. However now i only get a System.NullReferenceException as a line in the Immidiate window;
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
Is this due to some setting, or why don't I get any better indication?
I have a class library that is referenced by several other class libraries along with the main program. About two weeks back, I made a change to one of the classes in that base library, which is used as an argument for some events. Since that time, I have been testing code. Today, after a couple more tests, I started getting this exception. It is indicating a field is missing, which was renamed in that change about two weeks ago. The exact code that is raising the exception is code that I have run a couple dozen times in the intervening time, and it has always worked.I have tried everything I can think of, including deleting the bin and obj folders of every module that could be in any way related to this issue, such that the whole thing was rebuilt. I have removed the references and re-added them. Nothing worked. Code that has run fine for weeks has decided that it wants a version of an object that has not existed for weeks.
This problem arose immediately after a different problem, so the two might well be related. The other problem was that, while stepping through code, the IDE decided that one of the code pages was different from when it was last loaded. I get that a fair amount, and solving it is fairly routine. It generally means that I am stepping through code in a dll, and inadvertently tried to fix a bug in that code, rather than in the dll itself. Now it no longer matters. I can't get to that code page, nor can I get to anything else in that dll. It is acting like it has sponaneously decided to revert two weeks back in time, and use that source code for debugging, despite any attempt I make to bring it up to modern times.
I have creating timekeeping application, I was used drag and drop for my datagridview. During build I can add, edit and delete records. But when I published and run there was an error saying (see below). [Code] When JIT debugging is enabled, any unhandled exception, will be sent to the JIT debugger registered on the computer, rather than be handled by this dialog box.
I have an ASP.Net form where I use a DropDownList control to display data retrieved from a table. However setting the SelectedValue of the DropDownList to a value not existing in the dropdown list does not trigger an exception.
i two tables named tblaccess(nID,nRoleID,nModuleID,cAccess) andtblmodule(nModuleID,cModuleName) and i have a datagrid which is bounded to tblaccess. the problem is, I want to display cModuleName from tblmodule instead of nModuleID. please tell me how.
When I add a .dll file as a reference in C# application it shows an error:A reference to the ".dll" could not be added.Please make sure that the file is accessible and that it is a valid assembly or COM component.
I'm using visual studio 2010 to build my application and SQL server 2005 to store the data. I created a table adapter, dataset and binded the controls to my already made formThing is, i'm trying to insert a new record into the database and it won't work! I can fill the form with a record from the database and update it so i know its definitely connected correctly. Everytime I try to insert a new record whether its through a table adapter or manually, I just can't seem to get it to automatically save to the database.Ive put this under the save button
Private Sub SaveBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveBtn.Click Dim CustomerRow As accountingdbDataSet.CustomerRow
