Handling CRUD Operations For A Linq To SQL View
Jul 7, 2009
I am running into a problem where my CRUD operations on an entity sourced from an SQL View is not calling the generated methods for said operations.I press "Delete" in a ListView on an item, connected to a LinqDataSource. It throws an error saying that it cannot perform the operation because it affects multiple base tables. That's fine, I understand that. What I don't understand is why this code won't run on insert/delete:[code]In debug, it won't break on the method, so it's not being called. I even did a test where I deleted the entity by attaching/DeleteOnSubmit and still no-go. Is this a bug or am I not handling the right method? I can handle a data source's OnDeleting event, cancel, etc. (which is my temporary fix) but I'd really like to catch ALL delete operations in a central place no matter how I delete the entity.
View 1 Replies
ADVERTISEMENT
Jul 22, 2011
I have a basic calculator that Multiplies A and B to give a result of C.I want to be able to once multiplication occurs then to add the data to 3 column listview where in Colum 0 the value of A will be entered, Column 1 the Value of B and Column 2 C.For every operation done then to follow on the next row and so on until Memory Result button is pressed, which would mean the end of transfering the data.
View 1 Replies
Jul 26, 2010
I currently have a View in MVC where I pass a single set of data to the view. However, I've come across a problem where I am having to use a LINQ query within a For Each loop in the View to pull out additional information from a SQL View of data from another DB.
The error I'm getting is Late binding operations cannot be converted to an expression tree.
The particular snippet I'm encountering the error on is:
[Code]...
View 1 Replies
Nov 12, 2011
From r In ReceiptLines
Where
r.RECEIPT.RECEIPTDATE >= _reportStartDate
And r.RECEIPT.RECEIPTDATE <= _reportEndDate
[Code].....
I am fetching all departments and their sales, average, count from the ReceiptLine, Receipt, ReceiptDiscount tables. The problem i am facing is, if i remove where discount > 0, I am getting null exception. But if I include that, then I only get sales that has discount. How would I write query that bring all sales less discount (if it has one).
View 2 Replies
Jul 25, 2011
how to create then add and delete txt files to the resources folder using code ?(not with the mouse right click on the resources folder in the solution explorer)
View 1 Replies
Dec 23, 2009
I have the following query that groups parking spaces by their garage, but I can't figure out how to iterate the data in the view.
Public Function FindAllSpaces() Implements ISpaceRepository.FindAllSpaces
Dim query = _
From s In db.spaces _
Order By s.name Ascending _
[code]....
The controller is taking the query object as is and putting it into the viewdata.model and as stated the view is not currently strongly typed as I haven't been able to figure out how to do this. I have run the query successfully in linqpad.
View 2 Replies
Nov 8, 2011
If I have the following ListView, how can I attach a SelectedIndexChanged event listener to the DropDownList so I can perform a command on the respective object? Imagine I have a list of new users and I want to add them to a usergroup by selecting the group from the DropDownList.
<asp:ListView ID="NewUsers" runat="server" DataSourceID="NewUsersSDS" DataKeyNames="ID">
<LayoutTemplate>
[Code].....
View 1 Replies
Dec 13, 2009
What are the improvements in vb.net compared to vb6 that make developing such an application easier?
View 3 Replies
Oct 19, 2010
find a DataGridView CRUD Sample.I need to find the events of the DataGridView, because I can't do this, special when I need to change from column 1 to column 2 and from column 2 to column 3.The only that I need is the link.
View 13 Replies
Nov 29, 2010
[code]And this is the code, coming from the web service's vb page, where I'm getting the error:[code]MusicDataTable comes from a dataset called music.The GetMusic() works because I'm not passing it anything. I'm not sure why insertSong and deleteSong aren't working.
View 1 Replies
Dec 8, 2010
I am having some problem in binding my linq with my data grid view..The code for binding is as follows:
objdt = objdalProduct.SelectProduct() It brings all the data from the database
Dim Query = From Product In objdt.AsEnumerable _
Where Product.Field(Of String)("ProductName") = cbProductName.Text _
Select New With _
[code]....
View 2 Replies
Mar 3, 2009
I need to throw together a quick CRUD asp.net site, but this may become a bigger application down the road. I have some experience with SubSonic, but it has been so long since I did a project with it I have to relearn it. I am also considering using Dynamic Data.
View 5 Replies
Jun 23, 2011
Here's what I tried, but I get an error at run time on the AddRange line that states "Only parameterless constructors and initializers are supported in LINQ to Entities."
[Code]...
View 5 Replies
Aug 29, 2011
a friend of mine wants to create a simple inventory database that can be deployed on the web.He has had a lot of experience with Database tools like Paradox. Moreover he has experience with writing Macros and programs with Basic, and even a bit of C++ experience. He uses Windows and Mac OS X, though mostly Windows.
If the requirement of having a web application wasn't there I would recommend MS Access.
[Code]...
View 6 Replies
Apr 4, 2011
So I'm developing an application in VB2010. The idea is to perform CRUD operations (more or less) to an Access2003 Database. The database is relational, yet I haven't grasped the best architecture to make an application to interact with it. I tough doing a Business layer with a domain model would work. Controllers for each Use case (which are basically CRUD operations) would create Domain Layer object. Yet I don't know yet how to manage the mapping of the objects to/from the database.
View 8 Replies
Sep 29, 2011
So I'm writing a query as follows:
Dim assSummary = From a In db.Assignments
Join ur In db.UserRegions
On a.Origin.ID Equals ur.Region.ID
[code]....
In the controller I can return the data easily as follows:
For Each c In assSummary
MsgBox(c.Description & " " & c.AssCount)
Next
If I pass the object through to the view using Viewdata("assSummary") = assSummary, how do I display the data? Every method I've tried results in messages about 'VB$AnonymousType_7(Of Integer,String) and I don't know how to retrieve the data from the anonymous type.
View 1 Replies
Feb 10, 2012
my update script in VB.NET, i'm making some stuff, and I want, while all funcs are executed, a progressbar to be displayed? How to do that? Here is my execution sub:
[Code]...
View 1 Replies
Dec 19, 2011
I'm new in VB.net but I'm trying to make application (planning-game). The game is about showing students the planning 'complexity' of a operation room in a hospital. I created a listbox which randomly shows 5 operations. But now I would like a function which makes it possible to add a selected operation to a timetable. The timetable has blocks of 30 mins (example 08:00 - 08:30, 08:30 - 09:00 etc..). This because 1 type operation takes 1 hours and 1 takes 1:30 hours. Now I have given the operations a value by using a label. [code]
View 1 Replies
Dec 10, 2009
I have an idea about improving the assigning operations of VB.NET (maybe other .NET languages too.) It is similar with "With ... End With" block:
[Code]...
So we don't type "Some Text" every time. Do you think does this idea work? Maybe in the future we can see something like that?
View 3 Replies
Jan 6, 2012
Ime1 = ListView1.SelectedItems(0).Text
ListView2.Items.Add(Ime1)
If MkCal1 < 0 Then
ListView2.Items(0).SubItems.Add("Nepoznato")
Else
[Code]...
The problem is when I click the next time to button, listview2 add only first rows from listview1
View 3 Replies
Sep 13, 2009
I have an application in which I am running a separate thread.
Dim thread As New System.Threading.Thread(AddressOf Main)
thread.Start()
However, the thread makes reference to an textbox named Output, and it generates this error upon execution:
System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'Output' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
(message shortened for space)
How can I make the operations run on another thread, but still use the Output object? I cannot call a subroutine to do that for me, as it generates the exact same error.
The method called is AppendText, by the way.
View 3 Replies
May 23, 2010
I have 2 child nodes under a particular node. I want to do operations on the second child node. The code goes like:
Dim pChain As XmlNodeList = pChainDoc.ChildNodes
Dim processName As String = ""
For Each pNode As XmlNode In pChain
processName = pNode.SelectSingleNode("//Name").InnerText
[Code]...
View 1 Replies
Dec 22, 2011
The following commands I used them in VB6 for database operations MsAccess which are, kindly DataBaseDataSet corresponding commands in VB10?
- Data1.Recordset.FindFirst query
- Data1.Recordset.NoMatch
- Data1.Recordset.MoveLast
- Data1.Recordset.AddNew
- Data1.Recordset.Edit
- Data1.Recordset.Delete
- Data1.Recordset.Fields("nome campo") = dato
- Data1.Recordset.Update
View 7 Replies
Aug 19, 2010
I have a few syncing routines that I'd like to use for FTP uploads. However they all use the functions in the IO namespace, and I was wondering whether I could use it to access distant files stored on an FTP server.
View 1 Replies
Aug 19, 2010
I want to create a dll in VB.NET. The functionality of the dll is that it should include all the xml operations. Any application that uses this dll will just pass the node that has to be selected. The dll will accept the node name and search for the node in the xml file and return the details of the node. For example:if the xml file is like
<Node1>
<Node2>
<Node21 Attribute1 = "Value1" Attribute2 = "Value2" />
<Node22 Attribute1 = "Value11" Attribute2 = "Value22" />
[code]....
If the application which uses the dll calls a function named readNode(Node3) which is defined in the dll, then the dll should be able to retrieve all the details of Node3 including subnodes and theire attribute values and return it to the calling application. All the XML operations are to be done in the dll. The calling application will just call the method in the dll by passing the node name and it should be able to get all the node or attribute values.
View 1 Replies
Apr 1, 2011
In my API class I encountered a lot of times I had to Get/Set low/high order <something> of <something>. For example, get the low order integer from a long. I made a few functions for this: [code] Before I start using these functions permanently, I come to ask if it contains any bugs, especially because of the Unsigned/Signed issue.
View 15 Replies
Jul 19, 2010
I'm re-writing some old application in VB.NET to C# and ASP.NET 3.5. Everything is going OK but I have this problem - and, as the database will not be changed, I must find a solution to it.The old app saves the list o desired days (from Sunday to Saturday) in a byte. This is the way it do it:
If chkDaily.Checked Then
daysBitmask = 127 ' This is for a full week
Else
[code]....
View 1 Replies
Jul 22, 2010
In my projects (WPF) I use System.Windows.MessageBox to show the user a confirmation dialog for operations that are critical, such as a delete-operation.
My problem is that if I specify as button value MessageBoxButton.YesNo, the user cannot use the escape-key to cancel the operation. IMO this is one of the most annoying things, a program can do, showing a dialog without the possibility to cancel/close the dialog through the escape-key.
Other possibilities are MessageBoxButton.YesNoCancel, but IMO this is confusing because it shows three buttons for only two operations . Or one can use MessageBox.OKCancel, but this is IMO not clear enough. In my dialogs I want to ask the user if her really wants to execute the operation. And for this, a simple ok is not appropriate. A yes (I want) is much better than an ok (go on).
How do you handle this? Is it a non-topic or do you think as I do and have an own MessageBox-implementation or do you know a possibility to extend the System.Windows.MessageBox-class?
View 1 Replies
Jun 10, 2011
On compiling a visual basic assembly, int32 variables are cast as int64 for calls to adodb methods that require int32. This results in a method not found exceptions at run time. The unnecessary cast operation can be seen when using reflector to inspect the site of the method call and is not present in the source code.To further muddy the waters when the code is compiled on my 64bit windows 7 machine all is well, but on a 64bit windows 2008 r2 the unnecessary cast is added.
View 1 Replies
Oct 27, 2010
I'm using Visual Basic 2010I've created a ListBox and a BackgroundWorker using designerI want to change the location of listbox using backgroundworker but I get the error as follows:"InvalidOperationException was Handled by user code:"Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on
View 10 Replies
