VS 2008 How To Work With Multiple Updates By Linq To Sql
Oct 19, 2009
I would like to ask if it is possible to do a multiple records editing by linqtosql method in one click event? What I've been trying to do is to edit all the names in the table which are having the same account number. I was able to edit but only one name has been edited and the rest are not
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Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
[Code]....
Why is it these codes could only edit records in one datarow? Can you debug the codes to edit all records which are having the same account number after it is being query?if that is possible for you.
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Sep 11, 2010
it is possible to do a multiple records editing by linqtosql method in one click event?What I've been trying to do is to edit all the names in the table which are having the same account number.
Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
Dim db As New memrecDataContext()
[code]....
Why is it these codes could only edit records in one datarow?Can you debug the codes to edit all records which are having the same account number after it is being query?
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May 29, 2012
I found that when group by multiple values does not work well with VB.NET, but it works well with C# ,here are my code, is there something wrong with my VB.NET Code? Here is my VB.NET code:
[Code]...
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Jul 9, 2009
I have a program that uses sql for the database. The issue im having is when two users attempt to update the same record then the update from second user overwrites the record from the first user. I believe this problem comes from the the way i attempt to preserve existing text in the fields.
My thought on whats going on is: If the form has fields A and B. Both users start with a blank form. User 1 adds a record with an entry in field A. When user 2 goes to update the record with an entry in form B, the program overwrites user 1s field A entry with the blank field A from user 2.
Is there a way to force it to grab the most recent data before it tries to add/update? I thought about resetting the digit combo box to the same digit which would trigger the change event for that field. but the issue with that is it would also wipe out the current entries on the form.
Below is the change event for the digit combobox, the main submit procedure, and the subprocedure for one of the days.
[code]
Private Sub cboDigit_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboDigit.SelectedIndexChanged, cboOffice.SelectedIndexChanged, dtEndDate.ValueChanged, dtStartDate.ValueChanged
[Code].....
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May 9, 2009
In grid there r checkboxes for selecting the records to be updated as soon as checkbox is checked textboxes changes to edit mode. when data is modified and update button is clicked updation should be done to the database.But when update button is clicked its not working.when i checked through breakpoints i m not getting the value for the variable strID.
Protected Sub btnupdate_Click( ByVal sender As Object , ByVal e As System.EventArgs) Handles btnupdate.Click
Dim strSql As New StringBuilder( String .Empty)
Dim cmdup As New SqlCommand
For i As Integer = 0 To GridView1.Rows.Count - 1
[code].....
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May 17, 2011
Since ADO.Net uses a 'disconnected' model where the data available to a single program is just a copy of what is in the database, what is the normal way to handle multiple programs needing to update the same table in a database? The problem I see is that a program can't update unless his copy of the data is the most up-to-date. Are we supposed to read before updating and hope that the update occurs before someone else changes the data?
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May 31, 2010
I'm using a SQL database and I'm writing a VB.NET client application. This application is used on multiple computers at the same time. If one of the clients makes an update to the database I would like to have the other clients to be aware of the update.
Has ony one already done this before?
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Aug 20, 2009
I have 2 console apps projects in the same directory but different projects. There is some common code in the App_Code directory and a common app.config which gets build into seperate .exe.config files.One module (VScanDemonStarter) starts up and writes to one logger with its own appender going to a seperate file. It uses an process.start() to execute the other module (VScanDemon) in another command prompt hidden window.When I run VScanDemon by itself it puts entries into its log file. When I run VScanDemonStarter it puts entries into its (different) log file, the VScanDemon log file gets created, but no entries. I can see it is executing because some files get moved from one directory to another. Just no Log entries.
<root>
</root>
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender" >
[code].....
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Nov 22, 2009
I'm struggling with getting Linq To NHibernate to work.I have referenced NHibernate, NHibernate.Linq and NHibernate.ByteCode.Castle . Also I have all other dependencies in the same folder.
Code / Error message:
Public Function GetProjectsByName(ByVal ProjectName As String) As List(Of Project)
Return (From x In _session.Linq(Of Project)() Where x.Name.Equals(Project))
End Function[code]....
... tells me that the LINQ extensions aren't loaded. Using NHibernate.Linq seems to be made in a way that it's incredibly easy to use, hence there are no tutorials on how to set it up. (Or at least I couldn't find any).
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Dec 7, 2011
I am learning MVC3 and transitioning to VB.NET from C# at the same time (Fun, I know). I am running through the MvcMusicStore sample for learning MVC3. All the samples are in C# so I am converting them to VB. I came across one piece of code that I was unable to directly convert and had to change slightly to get it to work.
why one way works and the other doesn't.
This does not work:
Dim albums = New List(Of Album)() From { _
New Album() With { _
.Title = "A Copland Celebration, Vol. I", _
[Code].....
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Apr 4, 2009
linq querying various nested tables in a dataset? I can't find something like that on the net.
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Jul 18, 2011
I've problems to detect if there are new rows in a DataTable Email_Total that is yet not imported into ContactDetail.
Dim srcUnique = From row In src.Email_Total
Select row.ticket_id, row.interaction, row.modified_time
Dim destUnique = From row In dest.ContactDetail
[Code].....
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Aug 8, 2011
Using VB.net and the following LINQ statement. I suspect the "Order by" does not work with Concat(). I want to list the current item the user has and then list more available items in asending order. So first i select the current item from the db and then select the next available items in order. LINQ is ignoring the order by statement and sorting by the PK (which is itemID) I examined the list immediately after executing the statement. When I break up the statement and do them separately they work as predicted.
(From items In myDatabase.ItemAssignments _
Where items.BuildingID = buildingID _
And items.ResidentID = ResidentID _
[Code].....
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Mar 15, 2011
I face a problem that if i make a datattype in sql server of Integer and then use it in linq to sql query it give error of "specific cast not valid" and when i change datatype into varchar the linq to sql query work fine one more thing how to use linq to sql query to make crystal report?
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Dec 13, 2011
I am looking for the code to consolidate multiple .xls sheets from within multiple work books in a file all containing the same format of information. Each sheet needs to be coppied to a new sheet within a single work book.
Once in a single sheet I need to then copy data from a range of fields into one consolidated sheet.
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Oct 1, 2010
what's the best way to handle the updates to the database.For example i have one datagridview that's binded to a datatable (with two fields, id auto incremented and a varchar). The user can do all the operations Insert, Update, Delete.If i insert one row (only the text) and call the update method to save the changes to the database, and after that remove the same row and call the update method the adapter will throw a exception because it didn't update the datatable with the value of the id. So the best way to do this is always calling the fill method after every update?
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Jul 27, 2009
here is part of the code i am working with at the moment:
Public Sub runbar(ByVal time As Integer)
sleep(2)
Dim i As Integer
i = 0
ProgressBar1.Maximum = time
[Code]...
The problem is that when i click the button to run this, it does the runbar animation BEFORE it updates the text box. I have even tried putting a loop around the TextBox1.Text = obj to see if that would force it to work, but it did not. I would like to know if there is anyway to get the text to update before the runbar animation runs, just seams weird as i have the text editing first lol.
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Aug 17, 2009
Last night 3 updates automatically installed from VS 2008 on my comp KB952241, KB971091 and KB973674 Today intellisence was not working for .net - I uninstalled the updates and everything is, once again, working fine I dont know what update did it ... But I was just wondering if anyone else has experienced this - I would rather not have the updates if they stuff things up.
Oh - and before anyone asks - I tried resetting the visual studio settings
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Jul 29, 2011
I was wondering if there is a way to detect if Windows Updates are currently being installed.The reason is that I have written some software that sends my PC to hibernation if is idle for a specific amount of time, but I do not want this to happen if Windows is in the process of updating.
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Apr 29, 2010
i'm having troubles with a linq-to-sql statement and getting a left outer join to work. here is a sample of two tables i'm trying to join and my code that i've wrote.
Table1 Table2
f1 f2 f3 f4 fID f1 f2 f3 f4
val1 val2 val3 val4 1 val1 val2 val3 val4
[code]....
Instead I'm returning ALL values from table 1. I need to return all values from the left outer join where tbl2.fID is null.
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Apr 21, 2010
Is there any way to determine that a system has automatic updates enabled and has the little yellow security center icon indicating that updates are available? I'd like to drop a little service on one of my servers to monitor for that condition but can't find a good resource to get started.
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Jun 6, 2009
i am making a software =D (Does the Name matter ??)
Ohk so its gonna be my first try
my last soft was a success with 800+ downloads
so i want my program to check for updates everytime it opens or like when it clicks on a button
then it checks if there are updates then it will show the link to download the new exe file in a messsage box or in a textbox
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Oct 12, 2010
I have code similar to the code below that works in other parts of my program. The reason the code below does not work is because the datatable is made up of data from two separate tables. Does anyone know how to make this work for multiple tables? Can I choose what fields to send back and where to send them? This is what fills my datagridview and it works fine.
[Code]....
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Feb 23, 2009
i dont know anything about any of them XD
1). Whats a server? are they web based or locally on a pc?
2). I've made a program and want to make updates for it and put them on the web for download, Do i need a server to do this?
3). How do i make updates work on visual basic 2008, i mean ive made a program and i want to put it on the internet but i also want to bring out updates, apparently i can use visual basic to automatically download updates and install them. What do i need to do this? where can the updates be downloaded from on the internet? will a file share like rapidshare work?
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Feb 23, 2010
Okay so i made a small code that my application can check for updates onstart time. The problem is that it freeze up the application. How can i make it work faster.
Try
My.Computer.FileSystem.DeleteFile(My.Application.Info.DirectoryPath.ToString & "" &
"v.txt")
[code].....
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Nov 16, 2011
I've got a question below:load data from a table in database into a datagridview,make change in datagridview,and use update function to update change back to tablebut 13 changes, only 12 being update back to databaseonly the top row on the datagridview not being update??
For Each orow As DataGridViewRow In DataGridView1.Rows
orow.Cells(1).Value = TextBox1.Text
Next
[code]......
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Sep 5, 2010
I have a datagridview which is bound to a local databse table through a Linq to SQL class.
Everything works as I would expect, when the application runs, up to a point.
If, in the datagridview tasks pane I enable Adding, Editing and Deleting all work as expected.
If I disable Adding & Deleting, leaving Editing enabled, Editing works as expected.
If I disable Deleting & Editing, but leave Adding enabled, Adding does not work, despite the row for new records being displayed. I can move around the row but not enter data.
I suspect somehow its the datasource as opposed to the datagridview that is the cause of my problem but as I say, I can add rows if the Enable Editing option is selected.
Changing the relevant properties programatically makes no difference.
I've been searching for the reason for a couple of days without success.
I have a workaround, by leaving Enable Editing set and programatically setting each row during the RowPostPaint event to be readonly except the row for new records. I would just like to understand what is going on.
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Aug 21, 2009
I have a form that works on my local Machine I created into. I have Office 2007 on this machine. I created the Form with the Excel 12 Reference. I move the Entire conetence of the Project folder to my work computer. Which has Office 2003. Do I need to recreate the form with the Excel 11 reference. I could not get the form to work on work computer. IT has a com error. I am acessing the EXE for the debug folder w/in the Bin Folder.
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Oct 29, 2010
I have a linq union statement that has been giving me some trouble and I can't see where the issue is.The error is....All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.
I know the error means that I am selecting different amounts of elements in one of the linq statements, but I've examined this query extensively and I haven't been able to see that as the issue.
[Code]...
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Mar 4, 2012
I am trying to pass several search parameters to an LINQ expression to retrieve all entries that contain one of the search items.
Example:
Dim query = From p In db.BEW_PROFIL
For Each searchItem As String In searchItems
[code].....
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