DataBinding LINQ DataContext - Add A New Record Since The Textbox's Are Binded To An ISingleResult?
Aug 13, 2009
I have a LINQ to SQL DataContext with all my tables and all my stored procedures in it. Let me first start off by saying that we are upgrading our project from an access project to a WPF project. So in the Access project you could set a forms datasource to a stored procedure and edit and add new information. So in my WPF project on the page load I call my stored procedure to return an ISingleResult and then call a function to set the binding on every single textbox on the form. One is there an easier way to do this and two what if I want to add a new record since the textbox's are binded to an ISingleResult?
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Feb 6, 2009
Can i update my record using the textbox which are bind with database table record
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Apr 1, 2010
I would like to know if its possible to discard changes of only one record of only one table in datacontext. I use databind to bind my controls on a form. I modify one record at a time. after the modification, the user have to hit save button to validate. But he can hit cancel. I would like that the cancel button discard all the changes that the user has done. Is it possible?
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Dec 27, 2010
I have some data in my Linq.DataContext.I had succes in converting it to an XSD - Schema, using the following code:
Dim changeset As System.Data.Linq.ChangeSet = c.GetChangeSet()
Dim objDic As New Dictionary(Of System.Type, List(Of Object))
If Not changeset Is Nothing AndAlso Not changeset.Inserts Is Nothing AndAlso Not
[code].....
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Aug 17, 2009
How to bind a textbox in design view to a LINQ to SQL datacontext class?
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Jun 27, 2011
I have an object that may have been inflated via a plain old DataContext, or may just have been new-ed up with just its .ID property set. There's no way to know for sure. I'm looking to rehydrate the entire object from whatever is in the database. If the object was new-ed up, I can call .Attach() on the table object and refresh from the Data Context with no trouble. But, if the object was already inflated from the DataContext I get the error: "Cannot attach an entity that already exists.". There's no timestamp field or anything like that - just an integer primary key being used to control the rehydration. I'd like to know if there's a way to conditionally attach. Here's the code - it works the way I want it to, but this seems a hackish way to go about it:
' myDC is a shared instance of a vanilla DataContext...
' myObj is an instance of a linqed-up `SomeLinqObject`
Dim tbl = myDC.GetTable(Of SomeLinqObject)()
[Code[,,,,,
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Mar 18, 2009
I'm going through an XML file of articles and the journalist(s) that wrote them. As we are adding the articles into _Data our datacontext we may come across a journalist that needs adding so we do this: [code] However subsequently we may come across this same journalist again and nothing is returned when we do this: [code] So it uses the code above again to insert the same journalist again.Once all of our inserts are done we do a submitchanges. At this point it has a head fit:INSERT statement conflicted with COLUMN FOREIGN KEY constraint 'FK_ articles_ journalists_journalists'. The conflict occurred in database 'blah', table 'journalists', column 'id'. The statement has been terminated.From looking through the sql generated in sql profiler you can see that it is trying to add some journalists more than once, this will fail as the name must be distinct. The subsequent records that are trying to be inserted with these journalists are failing as the journalist wasn't updated.Surely if I have a collection of journalists, add some to it and then look in my collection I should see all of them and not just the original ones.
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Apr 26, 2011
I made a window for the purpose of managing "profile" records
while the navigation and updating is working
i cannot seem to get insertion working, as well[code]...
when i press add, i get a new empty record, when i fill it in, i see that the collection sees it, as there is an onform listbox showing the profiles, and it gets listed there, so its actually attached to the list, but the savechanges command does not insert it into the db
there may be some validation errors upon insert, but then i would get some indication, right? now its just silently failing. as if i never tied to commit changes
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Apr 30, 2009
EMP_IDTextBox is from datasource on a form, and I tried to show messagebox to see what the value is
Whenn I try case 2, the messagebox shows me correct value, but not for case 1. It shows me no value even though there is a value.
How do I do it and what is the diffrence between case 1 and case 2?
I tried with a textbox which is not binded to datasource on case 1, then that shows me the value.
Case 1
Public Sub Save_Data()
Dim L_EMP_ID As String = Me.EMP_IDTextBox.SelectedText
MSGBOX(Me.EMP_IDTextBox.SelectedText)
[Code].....
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Apr 7, 2009
I decided to iterate through the Data.DataTable and trimmed the values there.Utilizing SirDemon's post, I have updated the code a little bit:
[code]...
I know that on the DisplayMember line the .First.Item() part is wrong, I just wanted to show what row I am trying to designate as the DisplayMember.
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Apr 17, 2010
In a winforms application (VB, VS2008 SP1) i bound a checkbox field to a SQL Server 2005 BIT field. The databinding itself seems to work, there is this litte problem: user creates a new record and checks the checkbox, then the user decides to create a new record (without having saved the previous, so there are 2 new records to be submitted) and checks also the second.
[Code]...
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Nov 27, 2010
I seem to be having a problem binding the visibility property of a textbox to a database value using the advanced binding property.I found this article (BUG: Inconsistent behavior when you bind the Visible property of a Windows Form control to a Boolean field) stating there is a bug in some ol
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Jul 25, 2009
I have a form with lots of textbox, and a dateTimePicker. All of these controls are binded to a JoinTableDataBindingSource. So when I wanted to insert a new value or update the values, I have to rebind all these controls to the respective tableBindingSource.So after saving all the values to database, I rebind them again to the JoinTableBindingSource to display the values accordingly.
All these works perfectly until I tried to bind the DateTimePicker. I am able to show the Date, insert new values to Date, and updating date.However, after all the binding and rebinding,whenever I tried to call tblJoinTruckTableAdapter.Fill (me.dataset. tblJoinTruck), All the textbox.Text becomes "Nothing". I am unable to show the values in the textbox.
Everything works when I commented off the binding and rebinding of dateTimePicker. I seriously have no idea what had happen.Below is the binding and rebinding of my dateTimePicker.'I have clear the databinding before adding this to point it back to its respective table.
dtpTareDate.DataBindings.Add(
New Binding("Value", TblTruckBindingSource, "dtTareDateTime"))
'After inserting or updating the values, I clear the binding and rebind it back to tblJoinTable.
dtpTareDate.DataBindings.Add(New Binding("Value", TblJoinTruckBindingSource, "dtTareDateTime"))[code].....
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Dec 5, 2009
I seem to be having a problem binding the visibility property of a textbox to a database value using the advanced binding property.
I found this article (BUG: Inconsistent behavior when you bind the Visible property of a Windows Form control to a Boolean field) stating there is a bug in some older versions of the .net framework.
Does anyone know if this has been fixed in 4.0?
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Oct 7, 2009
What wrong with my databinding? How to correct the perfect binding with combobox and texbox.. When I select Projectname the other are changing except the email... Why the email is not changing?
Code:
commemails = New OleDbCommand
daemails = New OleDbDataAdapter
dsemails = New DataSet
dtemails = New DataTable
myconn = New OleDbConnection(("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=") + My.Application.Info.DirectoryPath & "SMRPsource.mdb")
[Code] .....
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Jun 5, 2010
I have the following code i got from another thread and modified it to be able to navigate through records. The first record of the table is loaded into the textbox, but will not navigate. Tested already with a combox and worked, so i'm sure there is data in the bindingsource.
Me.BindingSource1.DataSource = MyData
Me.BindingSource1.DataMember = "ParentTable"
Me.BindingNavigator1.BindingSource = Me.BindingSource1
[Code]....
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Jan 23, 2011
My database : table1
ID FIRSTNAME AGE
1 Sumit 22
2 Sanjeev 23
i have gridview 1 and textbox1 and button1 i want when pages load the gridview displays the all records from table1 and also ...i i wanna search record for firstname by typing sumit in textbox1 and click on button1 then in gridview the record of sumit will be shown ..by default gridview display alll records from table1 How to do this My Selct Query is below : but it doesnot display all record ...but it can display record if you search for a particular record .
[Code]...
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Aug 26, 2010
I'm relatively new to VB.NET and am having a problem when Databinding a Class to a Forms Controls. Basically within the Class, when Setting certain String Properties I heck that they are not Null/Empty and if they are Throw an Exception. The problem occurs when I bind the properties to textboxes - when the textbox is empty I expect an error to occur (which I will handle). So does anyone have any insight or solutions into why the exceptions are not being thrown when a textbox changed to an empty string?
A condensed example follows:
Dim a As New SomeClass("Random", "Text")
Dim f As New SomeForm(a)
[code].....
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Apr 27, 2010
I have a form, frm1 w/a combobox, cboLocations, which is being populated using a sql string. There is also a frm2 w/a series of textboxes and other comboboxes. I want it so that once a selection is made from cboLocations, the textboxes and comboboxes on frm 2 are populated with the corresponding data. Here is what I have so far:
frm1:
Public Class frmLocations
Dim conn As New SqlConnection("Data Source=f03d3s-dev01; Initial Catalog=dos_track;User Id=vbuser; Password=tran3;")
Dim depot_refnbr As Integer
Private Sub frmLocation_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
conn.Open()
[Code] .....
What's happening right now is that I make a selection from cboLocations on frm1 and click on the OK button, frm2 loads, but none of the textboxes are populating and one of the comboboxes, cboDepot, shows the different data when you click on the down arrow, but it's not displaying anything it its text field when frm2 loads.
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Mar 2, 2009
I have been utilizing Scott Gu's tutorials on LINQ to SQL to try to learn some LINQ. I have been able to view, retrieve, and update records but I am unable to write new records into the database (MSSQL). Scott starts getting into inserting rows in the fourth section of the set of tutorials. As you can see on that page (or may already know), in order to add a record you must do the following (VB.NET)[code]...
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Aug 1, 2011
I am trying to insert a new record though linq. I am able to update and read data with out any problem, but how to just inset a new record. Here is a start of my function.
Public Function AddAddressInfo(ByVal objdeptGUID As String, ByVal objGEOCode As String, ByVal objArressCommonName As String, ByVal objStreetAddress As String, ByVal objAddressNotes As String, ByVal objIsPublic As Boolean, ByVal objSesionToken As String)
''#Check of Token is good
If CheckToken(objSesionToken, objdeptGUID) = False Then
Return "Error"
End If
[Code] .....
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Aug 3, 2010
How can search record in my DataSet (fields: Name, Address, Phone#) for a certain name, given by user by clicking a combo box?
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Aug 22, 2011
I´m trying to update my Students table record using LINQ to SQL. The problem is when one of the Properties of the object changed and 'PropertyChanging' Event is fired using 'SendPropertyChanging()' method.
student_id is a PK
data types are matched
Here is the full ArgumentException:
GenericArguments[2], 'System.String', on
'System.Data.Linq.Mapping.PropertyAccessor+Accessor`3[T,V,V2]'
violates the constraint of type 'V2'.
[code]....
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Apr 22, 2010
What I have is a database in a Windows Form (via tableAdapters etc., basically the default stuff VS adds). What I need to do, is add a very simple record of a name and score (the "place" is an auto-number). I have not even been able to tackle sorting the table, because I can not even figure out how to insert...
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Apr 19, 2012
Our remit is to make a Veterinary Surgery Booking System.
I have an asp.net page that has 4 fields, one of the fields is populated on page load as per the vb code below.
I'm trying to get the selected value (or text) of the dropdownlist control and use it as the value for the first field in the record however every time I select the second or third value in the dropdownlist and click the submit button the new record that is created is inserting the first value in the dropdownlist.[CODE...]
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Jan 12, 2011
I am pretty confused about lambdas. What I am trying to do here is write a function that will return an object from a certain table with a certain criteria. So lets say I can write:
function GetRecord(TableName as string,Criteria as string) as object
'do the linq-stuff
end function
Now I don't care if the parameters are strings or lambdas or whatever, but the end result must be that at runtime I don't know which table and which criteria will be used. As sometimes I need to get a customer record by email and sometimes a product by id etc. If possible I would prefer returning a list of matching objects and then I would just use .firstordefault when I want 1 (such as by id...).
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Nov 14, 2009
I am using the following line of LINQ to drill down into an element. Is it possible to expands this code to drill further down so that I can add content to the <population> element in "Test2". I want to be able to do somthing like element.SetValue(1000000). However I need to expand the code below so that I can pass the entire query results into the variable called "element"'
Dim eles = From c In doc.Descendants("File") _
Where c.Attribute("Name").Value = "Test2" _
Select c
[code]....
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Nov 9, 2011
I'm very new to linq and I'm trying to come up with a linq query against a dataset that will return a max count value based on grouping records.[code]...
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Mar 24, 2011
For a school programming project we are supposed to create a database with 2 tables country, and continent.then we populate country with every country name, population and continentID. For continent we populate with each continent name.
i have completed this step, and i am able to run a linq query to display all countries and corresponding continent into a datagridview. My problem arises because we are supposed to display each record one at a time, and be able to cycle through one at a time. I cannot for the life of me figure out how to do this.
for example if i made a query to select all countries in africa, i want to beable to display the name of the country, and population in textboxes. then have a next button that will go to the next record.
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Mar 10, 2011
ok I have a weird issue. I created a master record in the master table and then a record in the detail table. when creating the detail record i get a Specified cast is not valid error. Now another weird thing is that once I create the master record I can't query and verify it was created. But when i got to sql management studio I can see the master record. Below is my two procedures and the table definitions. Master table primary key is INVNUM child table primary key it INVLIN_ID and the reference key is INVNUM
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