VS 2008 Exception Reading Database?
Dec 23, 2009
I have built everything for Beta one and I thought I had done very well until and Exception happens when I try and run it. Please could someone take a look at this and see if you know whats causing it:
Message: {"No value given for one or more required parameters."} Error -2147217904 Item: In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. I don't know whether more info is required from the error but it happens on this line:
DReader = DSelectCommand.ExecuteReader
[Code]...
I have checked the database is in the target location and the table names and column names are all correct.
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Mar 22, 2012
I'm trying to handle DBNull exception while reading data from database. It's my code:
...
Dim SQLRDAs SqlDataReader
...
val1= GetStringFromDB(Trim(SQLRD("Name")))
val2= GetStringFromDB(Trim(SQLRD("Level")))
[Code]...
But still I get Conversion from type 'DBNull' to type 'String' is not valid. error.
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Mar 17, 2011
in my program i have a list box full of rooms and when that rooms selected all its details are to be shown in a bunch of different labels. Problem is, no matter which room is selected the data readers only reading from the very first row in the database. I've got a variable to hold the name of wich rooms selected, but how would i use that variable to determine where the rest of the data should be read from.
heres the code that im using
Private Sub lbRoomLoc_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lbRoomLoc.SelectedIndexChanged
[code]....
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Mar 16, 2010
I'm currently doing a project, I have 5 text boxes, and the information I put inside them get's added to a record in my database..In this record, an auto-number is allocated, and I need to display what the auto-number allocated is..
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Dec 22, 2011
I looked everywhere online and I couldn't locate an equivalent VB2008 code for this php code.
$field = mysql_fetch_assoc($result);
$field_title=$field["title"];
I'm trying to read the content of a field in a mysql database. I found this code below that does it but you must select the position of the field (column 0, 1, 2 etc) myData.GetString(1) instead of the name of the field. In the php code above it is "title". I'm looking for a command like myData.GetString("title")
Dim myCommand As New MySqlCommand
Dim myAdapter As New MySqlDataAdapter
Dim myData As MySqlDataReader
[code]....
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Mar 13, 2010
how to perform the database operation such reading data and using them for comparison within the VB programming..
Please guide me with explanation as i have very little knowledge regarding the database operation...
i am using VB.Net 2008 as frontend...and MS SQL Server 2008 (express edition ) as back end...
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Jun 9, 2010
I have a SortedList
Protected _Items As New Generic.SortedList(Of String, _Control)
I am adding items into this SortedList
_Items.Add(_key, _Control)
[code].....
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Dec 2, 2009
Exception While Reading Excel Sheet Drop Down Value...
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May 8, 2009
It is possible to catch an exception and throw a new exception which wraps the first exception as an inner exception: [URL] Also, if I call a function and it throws a certain error, but I catch it, will the calling code's catch handler execute? If so, and it is of a higher exception type, is this not wrapping the exception? eg I can throw exception ex of type IndexOutOfRange, log it but rethrow, catch a higher up exception and do something, or I can throw a new exception and wrap an inner exception like:
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Nov 7, 2011
I have a very simple table in access. The data is stored from VB.NET using the OLEDB adapter. I have a second form which has just a single DataGridView which was dragged/dropped using VS2010 from the Data Sources window.When trying to view the window the first time no data is shown and the second time an exception occurs and the program closes.
[code]...
In the Immediate window after clicking the Form.ShowDialog() button this message appears: A first chance exception of type 'System.ArgumentException' occurred in System.Data.dll Also, the data does not load into the datagridview. After closing the window and then clicking the same button (Not data has been changed at all) this error appears: Input string was not in a correct format.Couldn't store <07/11/2011 00:55:06> in Time Column. Expected type is Int32.
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Apr 24, 2010
I am making a simple program that allows a user to add and delete contacts from a database. Whenever I try to delete a contact that was created in a previous session (by session, I mean time that I ran and then ended the program), it is fine, but when I try to delete a contact created in the same session, it says: "Concurrency violation: the DeleteCommand affected 0 of the expected 1 records." here is the code for the delete button: [code] I noticed that, since the error does not happen on a new session, that if I added the code that happens at the form_load, I could fix the issue.
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Feb 9, 2012
I'm creating this VB 2008 application and I want to make it into a CD so it can be installed in other computers. Problem is, after I create the setup and start it even from the computer that created the application in the first place, it gives me the "unhandled exception has occurred in your application. If you click Continue, the application will wignore this error and attempt to continue. If you click Quit, the application will close immediately." and "The following file could not be found: "C:UsersMyNameAppDataLocalApps2.0Data\VHMGGXM7.8K8..." errors.
Since my first "form" is a login system, I am not sure if this problem appears because of the database search, or just the transition between forms (unlikely, I guess, since there is sort of an introductory video before the login system which uses the same logic to transition between forms)... So I tried moving the access database to a different path and I wanted to know how to tell the program (through v.b.) that the database is now in "this path" without having to re-connect and create a new DataSet, which will make me have to start the whole project again. I set up the whole project in Program Files (a place all computers must have). The video before the login system works fine, but I can't really find any other problem.
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Jan 20, 2010
i have get that exception when save my db with TableManager.UpdateAll command:
Violation of UNIQUE KEY constraint 'IX_InstalmentID_DueDate'. Cannot insert duplicate key in object 'dbo.Instalments'.
This error only occurs if I remove existing records from BindingSource (without saving) and add them again (with same date) and then save the all changes with UpdateAll command. Here is the my table schema:
Instalments
DebtID (PK)
InstalmentID (UK - Unique Key combine* )
[code]....
I have created a unique key combining InstalmentID and DueDate fields. Instalments tables is a child table. Its parent table is Debts.
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Jun 16, 2010
I have a table in a database with 3 columns: OfferName, ExperienceAward, and GoldAward
I populate a combobox with the various offer names with the code below:
Dim con As OleDbConnection = New OleDbConnection( _
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:UsersDouglasDocumentsVisual Studio 2008ProjectsGameBoxRPGGameBoxRPGContacts.accdb;Persist Security Info=False")
Dim cmd As OleDbCommand = New _
[Code]....
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Mar 16, 2012
how can i display data from a sql database in a listbox?
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Oct 2, 2009
I have been trying to create a login page for a while and most of that time I have been searching for info on how to make it read the username, password and any other information off of a database.
I recently gave up and decided to use some code which reads it from a .txt file and this works and therefore I could complete the rest of the page and test it using the .txt file. However, a .txt file is not an ideal place to store the information as it is difficult to look at the text and find what you need to change if you want to upgrade the system to hold more data than before so therefore I came to this site to seek help on making the login page work with a database.
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Aug 24, 2009
Im trying to get my program to fill out textboxes with information it reads from a database, and then save the changes to the database. Does anybody know any good tutorials of this which i could look into?
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Jan 9, 2009
Private Sub frmAttendace51_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'clear data set of any existing data
objDataSet.Clear()
'fill schema
[Code]...
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Feb 9, 2012
I have a code wherein datagridview will load according to the query given.I have no problem with that but when i put a loading image while reading the database, loading image wont work as well as if i put only "Please Wait" to a label.I searched from google and said that backgroundworker sahould use to this problem. But how can i use the backgroundworker?i have no idea about it.
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Jan 25, 2012
reading and modifying data from database
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Feb 15, 2010
I want to read a csv file into an access database , here is my code :
Private Sub load_csv()
Dim ConnectionString As String
ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" & _
[Code].....
The strange thing is that the file really is there, so what else could go wrong ?
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Feb 4, 2009
I made a query in MS Access using fields from multiple tables. I want to display stuff from it into a listbox on the form and then I need to save stuff back too it also. But I'm obviously doing something wrong cos I keep getting the error: "The Microsoft Jet database engine cannot find the input table or query 'Today'. Make sure it exists and that its name is spelled correctly." [code] Also, I have written further down objDataSet. Tables("Today's Absentees") and "Today's Absentees" is a query not a table, what needs to be written instead?
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Jan 22, 2012
How to read data, submit queries from vb application to a remote machine running sql server. note: I have created a complete functional version of a stock control system with the database residing in the local machine. I just need the basic concept of interacting with remote databases that's all. Do we have to use sockets to read/send data ?
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Nov 1, 2010
1) i want to make my login page (which talks to a sql table called logins) my first page and it authenticates to that database and doesnt let you in until correct credentials are entered. ? not sure how
2) I have a Checklistbox that is populated with names - ( i want to be able to populate a database called members with those names(Firstname & Surname Only) and from a New members form populate the same members details into the members database this time including address email tel etc etc ....
3) create a delete button that will delete the information from the database and from the checklistbox1 (this is in case the member leaves the club).
4) how do you create trial versions keys etc ...
5) change a progressbar timer to last an 1½ and show hours minutes seconds but once the button is hit to stop the timer it automatically resets to zero.
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Jul 14, 2010
How can in include registry file when compiling my program?
I want to include an .ini to give the users the ability to change the database path for example
[DBConnection]
DATADIRECTORY
p:data
[Code]....
how to program it, or is there a better way than using ini files?
I'm using visual studio 2008.
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Aug 27, 2011
im trying to read a database that is online. My goal is to be able to store a database online, and be able to edit it through my application and the web (the web part is done). all that remains is the application.
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Feb 23, 2012
When I load data from xml to my dataset I want to apply this changes to database. This is my code, so far unsuccessful. [code]
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Jul 21, 2010
I have 2 tables loginInfo and UserInfo. LoginInfo Stores username and passwords while userinfo stores other user details such as Address,postalcode,phone etc.
I insert values into loginInfo first and if successful I enter the userInfo details. If exception occurs while entering details into userInfo i delete the loginInfo details.
This is how I do now
'login details are entered successfully
If CreateLogin(uName.uPass) Then
Try
'Create the user details
[Code]...
Is there a better way to deal with this situation? can use Transactions?
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Jun 11, 2011
i am having an sql query in catch block. the code is: Dim str_exception As String = ex.Message Dim sql5 As String = "insert into table_data(type,description) values
('ERROR'," + str_exception + ")" Dim cmd_sql5 As New SqlCommand(sql5, connection)cmd_sql5.ExecuteScalar() it throws an exception at cmd_sql5.ExecuteScalar().
the exception is - incorrect syntax near 'records'. i tried adding single quotes like'incorrect syntax near 'records' .' .but still it is giving me the same error. I think it is because of the quotes near records. this exception is thrown somewhere else in the code and then it comes to cath block. i want to save the exception in the database.
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Apr 11, 2012
have to say that, i got an error message when i finished publishig the project and then run it to another computer. Sounds either just in debugger problem or the way i connected and deployed my database called testMe.accdb is incorrect.Her's exact error message:ed exception has occurred in your application. If you click continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.'Could not find file 'C:Documents and SettingsAdministratorLocal SettingApps2.0Data2m00rzkj.q7t24497CHA.211haik..tion_809ead2214f990cb_0001.0000_e28c8a7595ad7f6Data estMe.accdb'.
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