Event To Use To Update The Database ADO.NET?
Mar 1, 2012
I'm getting frustrated on how hard it is to find a good DataGridView event, BindingSource event, or DataTable event to use to update my database. I have to use a stored procedure to do my adapters update, because when a user updates a row
I have to check for concurrency to ensure 3 other related rows to the row that has been modified hasn't been updated since the user obtained the data. For example, if my query returns 4 records and the user updates the 4th row, I have to ensure rows 1-4 haven't been updated since the user retrieved the records.
My DataSource is a DataTable and I use a BindingSource to bind it to a DataGridView. I want to update my database whenever a user changes a cell value in the DataGridView or when I change a value programmatically to the underlying DataTable. Anyone recommend an event from any of these objects?
The problem I'm having is this. When the user changes a cell in the DataGridView I want to apply a date time stamp in another cell in that same row before I update my database. If the update is successful for that row then I AcceptChanges or if it fails then I RejectChanges for that row. I can't change any values in the row in the DataTable RowChanged event because it will be an endless loop, plus it does fire when the user changes a cell. I can't use DataGridView CellEndEdit because when I change a cell value programmatically using a loop the event won't fire to do the update. I can't use DataTable ColumnChanged event because the row hasn't been set Modified so the adapter doesn't know to update the row.
What do the experts recommend?
CODE:
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Apr 22, 2011
Objective to clear the datagrid view after updating. This should happen when the user clicks the OK button when the update is confirmed. Below is what i have.I currently have
Private Sub SaveToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripMenuItem.Click
'This updates datsource
Try
[code]....
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Jun 23, 2009
I am fresher in vb.net but I have experience in vb 6.0. But I want to connect database in sql server through sql connection. In that case how to create connection with window or sqlserver authintication mode and how to add or update new record in data base in batch transaction. Please help me with sample code.
So that I can understand eassily.
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Nov 15, 2011
update statement, i am trying to update a row within a access 2007 database here is my code.
[Code]...
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Apr 15, 2012
I am using vb.net with access database. I am using sql. How can i update database with the value 40'6"(Feet and inches values)
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Jun 26, 2009
What is wrong with this code. It does not update the access database and no error.
Dim conn As New OleDbConnection
Dim sqlQRY As String = "SELECT * FROM StdMaster WHERE StuNo = " & txtStudentNo.Text & " ORDER BY StuNo"
[CODE]...
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Feb 11, 2010
is there a way to update a database row with the update command by first defining all parameters and then all values just like you can in the insert command? "insert into table1 (parameter1,parameter2,....) values (value1, value2,....)"something like "set table1 (parameter1, parameter2) values (value1,value 2,...) where ...."?because I only know the syntax to define each parameters value "set table parameter1=value, parameter2=value2... where"
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Nov 26, 2010
I have a class written in C#. In it I want to run a certain function in parallel on a list. After it completes on each item I would like to update a progress bar. However, I get very odd behavior from my program. It executes the event and reaches my sub but never proceeds to actually execute any code. Instead it just freezes. (I've mixed vb.net and c#. It will be rewritten at some point)[code]So for some reason I get it to enter progressBar Counter on each item in the list but it never exists. Instead it just keeps the form frozen.
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Dec 29, 2010
[url]... I managed to figure out how to paint a bitmap on a form. With some slight modification, I managed to make it so that the position of the bitmap can change based on key strokes.However, for some reason, it only does this once. It can't be that the xPosition and yPosition aren't responding since I rigged two labels to tell me their values and they are changing. So how can I make the bitmap respond.[code]...
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Apr 6, 2011
I have a dataset and am committing changes to the database using tableadaptermanager.updateall. My datatable has a column called DateAddedToDB. When saving to the db, some records will have this column filled in, some won't. I want to use linq to update this column on each record that is null to a value of now() but am not sure what event to use. Is there an event like BeforeCommit or something like that? Or is my way of doing this completely inefficient and there's a much better way of doing this?
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Apr 20, 2010
This program is very difficult for me, but I must get threw it or I cannot finish... What I am doing is making a Database of foreign Languages with the spelling of the words and the pronounciation inside the database... The USER enters a paragraph of words into the translator textbox and pushed translate. The program has a DATABANK of words with the phonetic spellings and matches the word, then translates to phonetics. The problem is that new words keep appearing inside the language. So I incorporated a Database of 2 fields
[Code]...
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Sep 22, 2010
I have seen others with a similar issue but not quite what I was looking for. In the backgrounderworker class dowork event I create an instance of a new class and call one of it's function. Previously, I had this code in a windows.form.timer tick event and would pass a delegate in as one of the parameters which would allow the function and other functions it calls within the class to call a method on the form to update a datagrid on the GUI. Is there a way to do this within the dowork event? I need this because the function I call from dowork calls other functions and I want each of those functions to log information in the GUI datagrid.
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Mar 31, 2009
I am trying to use the key's W and S to change the Y cordinate of a rectangle. The key's work, but the graphic doesnt update [code]...
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Jun 6, 2010
I created a dataset and i am using OleDbDataAdapter to insert new values to access database. But when i close the program and after open it, values are not in the database. How can i solve this problem? Also, i have another problem. When i write codes that
[Code]...
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May 18, 2012
I am trying to implement an update panel on my web page. when I add this, everything works fine:
<script runat="server">
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Me.Label2.Text = Date.Now.ToString
[code]....
This will cause the event to not occur. If i change the "<" from the string, all is well. why cant I have "<" in my strings? This is important because i wont allow me to put an xml string in the text box.
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Nov 8, 2010
I think I have a timing issue. On the trigger of an event I call a function to update a value:
Private Sub t0_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles t0.Click
Input.ppProperty = "blank"
UpdateRecord("Hey", Input.ppProperty)
MsgBox(Input.ppProperty)
End Sub
[Code] .....
Notice the difference, the property does not update until the function is completely finished.
Why?
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Sep 11, 2011
What i have in a text box that is the discount. The text box talks to the label as you type and updates it accordingly The problem is that once the discount_rate.text get to 10 or above the discount is off by 5 cents and increases as the number goes up..
Private Sub discount_rate_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles discount_rate.TextChanged
Select Case radio
Case "one"
If discount_rate.Text = "" Then
[code]....
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Feb 20, 2012
I'm creating a dynamic gridview in vb.net using a connected sql database. Everything works fine except 1 thing: when i click the update command, the event just won't fire no matter what I do. the gridview goes into edit mode and the cancel button works fine. This has cost me over 2 days of googling but none of the solutions work. I used breakpoints to check if the code was executed, but it wasn't. If anybody has any experience in this:I believe the problem lies in the addhandler but it doesn't give any errors.I forgot to mention that the sql command was a test and sets the data in that field to 15, now it's 10, it works when i use a normal button or a static gridview.
Public Class WebForm1
Inherits System.Web.UI.Page
Dim rowscount As Integer = 2
[code]....
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Jan 31, 2012
A few weeks ago I wrote a wrapper for the ServiceController control to enhance and streamline the base ServiceController. One of the changes I made was to add a monitoring component using the System.Threading.Timer object. On any change of status, an event is raised to the parent class. The actual monitoring works fine, but when the event is handled in the main form, my program abruptly ends - no exceptions, no warning, it just quits. [code]...
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Apr 5, 2011
I have three asp.net textbox and button on my asp.net webform namely textbox1, textbox2, textbox3, button1 i want if integer value of textbox2 will be substracted from textbox1 then result will be displayed in textbox3 and textbox1 and textbox2 value will remain the same ....on buttonclick event ...
[Code]...
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Jul 3, 2011
I want to raise an event from a non-UI thread where the event will be handled by the UI. Currently, I have to use .Invoke in my methods (which updates UI) called from the event.
How can I raise the event, similar to Background Worker's progress update event, where I don't have to specifically do an .Invoke for UI updates?
Do I wrap the event with a delegate or something? Sample code will be fine though, if the explanation was tedious.
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May 4, 2012
I have a datagridview which is populated from a database. I have added buttons to this to edit, view, delete. For some reason using the edit button and updating the database my grid fails to respond. I have it set up to display an image based on the row I click on. Before the update this works, after is does not. After the update I run a reload() where I clear out the dataset and repopulate the datagridview. Here is the code I am using for the reload and the update.
Public Sub reloadDG()
'reloadDG is used to clean out the information currently in the datagridview and is replaced with
'current data
'calls refreshForm()
[code]....
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Mar 15, 2010
I have a datagrid, Records_tablesDataGridView. when i enter values into it's two columns and hit enter i want to update a label text to show how many records are in the records_table.I assumed that i would find an event in the datagridview properties that i would be able to use. so far no luck.
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Aug 11, 2009
i want to update my inventory table in database from another database name. Example: In VB, i had a form named Orderform. User need to select e product that they want and key in the quantity. all these information are able to store inside my database named ORDERTAB. but now the problem is i wanted to update another field in my database named INVENTORY by minus the quantity tat the user had key previously. i totally had no idea how it going to works.
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Mar 26, 2010
How would you create and use a delegate to update the text of the main form from the DoWork event of a backgoundWorker?
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Nov 4, 2011
How can I replace the text of a label control contained in a formview?[code]...
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Sep 17, 2010
I got a system which i want to insert, delete, update the data into my database and the data from database will be display using datagrid. The below is the coding for one of my button, delete.
Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
Try
btnSearchEmpNo.Enabled = False[code].....
Now I wanna set when user click on this button to delete a employee (for example) then the datagrid that i have in my application will not show the data of the deleted employee but in the background, the employee haven't been deleted from database.The employee only will be deleted from database when the user click on SAVE button.I know this application have to use RowState but how?
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Nov 14, 2011
I tried to update the button text on a form from a backgroundworker.do_work event, and it failed, with the usual cross-thread exception message.However, by pure chance, I also tried to update text in a system.windows.form.toolstripstatuslabel also from this backgroundworker.do_work event, and it DOES work. Question: why is this? Is it perhaps because theres some kind of implicit shared behaviour with system.windows.form.toolstripstatuslabel?
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Jan 13, 2011
I figure why this happens, and is because of Windows 7 and its permissions. Now I'm trying to fix this. but the code for this is a bit complicated for me. I found on this website an example on how to set the permissions on files. ([URL])
[Code]...
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Nov 15, 2011
i am just developing a library management system as one of my project. i using vb.net 2010 and the MS Access 2007 as back end. when i save some records into my database through my application it is correctly saved and i confirmed it through opening the relevant table in the database. but when i restart the application all the entered data were missing..
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