[2008] Closed: Entity Framwork - Bind To A Textbox In UI?
Jan 6, 2009
I have a application based on the entity framework. I have extended one of the classes (Quotes) wit 'partial class', and within that i've created a method that is completely independant of any database properties. For simplicity lets say it looks like this:
[code]...
All is good, except i need to bind this to my a textbox in my UI and have the textbox update automatically when the property is changed (like a dependency property). This is proving problamatic, I've tried both invoking the onPropertyChanged sub that the entity framwork exposes and implementing intoifychanged. Both cause errors.
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Oct 10, 2010
I have a query that will go away an and find data
Dim HSNs As String = String.Join(",", ListOfHSNs.Cast(Of String)().ToArray())
Dim query As String = "SELECT VALUE O FROM v_BillData AS O WHERE O.HSNumber IN {'" & HSNs & "'}"
Dim hs As New ObjectQuery(Of v_BillData)(query, CType(Session("ObjectCon"), ObjectContext))
What I now wish to do is to use the results of this query to databind to a EntityDataSource?
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Oct 2, 2011
Can any one advise me about a book to purchase to prepare for the MCTS:Microsoft Net Framwork 3.5 windows Forms Application exam?
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Jun 8, 2012
How would I go about getting text from several textboxes and adding them to a new row in a sql table in their respective columns? For instance, I have textbox id's and sql column names of:
[Code]...
The program will be storing the values in a multidimensional array to simulate data from multiple customers. I want each row in the array to be assigned to a new row in the sql table upon the click of a button. I've got everything setup but the writing of the all the textbox values into their own rows in the database.
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Oct 19, 2011
Using VB.Net, how can I save values from a textbox and checkbox when the application is closed? When the user opens the application again, the textbox and checkbox should be filled in with the same values as before.Do I have to save these values in a database, or what other options are there?
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Jul 27, 2011
I am trying to build a survey engine from an existing database design which is like this.
[Code]...
The line Order By Key.RecordOrder throws a null reference exception and I can understand why. Can someone advise on how to resolve this by just modifying this one query? I am fairly new to LINQ and the necessity to write this project
[Code]...
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Jul 22, 2009
I want to update an entity without loading the entity from the database first. I've accomplished this but only by knowing all of the entities properties and then using the "attachto" method. My issues is i don't want my app to need to remember all of the properties. Example:
[Code]....
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Dec 14, 2011
Entity Splitting: one class, two or more tables.Here is how it is done in C#, but I need to get it working in vb.net.One more thing: the class name and table columns do not match, so I have to be able to map that out, too.I have to get this to work this way because the place I'm working at right now is a vb.net only shop and the database schema is fubar, but they have so much (millions) of lines of code done directly against the database in both asp classic, vb.net, AND asp.net webforms that changing the schema right now is not realistically possible.
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Post>()
.Map(m =>
[code]....
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May 8, 2009
I am populating a textbox (txtFileNature) with a value from a popup window. The textbox has an onfocus handler set to
onfocus=("this.blur();")
The problem is that I want to do some calculations based on the value of txtFileNature and want to display the result below it. In which event can I can use my VB code. I can't use the textchanged event since I am not typing in the textbox.
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Dec 15, 2011
I try to bind a textbox to a datatable but i cant.. I checked if the datatable is filled (it includes the results of a sql query)and it s ok.. i can depict the result in a combo box but not in textbox. I wait for only one result that s why i need textbox instead of combo.. that s my code..
[Code]...
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Mar 15, 2012
how do i change the display member of a ComboBox after i have entered a code in a textbox that it represent the combobox value?example
Code: 02-001 Combobox: Provider X
if i change the code the provider combobox must change and if i change the provider combobox the code should change!..
if e.keychar = chr(13) Then
combobox.valuemember = textbox.text
combobox.displaymember = me.stockdataset.selectprovider(@textbox.text)
end if
this code change the combo box display member but if I change the comobox by clicking it the code on the textbox doesnt change, to its corresponding code...the combo box is bound to the provider tables....
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Oct 18, 2011
I'm creating a mindmapper application (as a test) and have a difficulty to manage created mindlabels and their childlabels.
So I thought of binding a list(Of textbox) to a textbox. But how can this be done?
Here is the code I have so far for the application:
Public Class Main
#Region "Methods"
Private WithEvents labelMap As TextBox
[Code]....
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Mar 26, 2009
I have a module where i have specified the connection string as below:
Public Function Connection() As String
Return "Data Source=192.168.0.1,1433;Network Library=DBMSSOCN;Initial Catalog=test;User ID=sa;Password=123456"
End Function
Then i have a form which has two textboxes. What i am trying to do is bind the two textboxes to a dataset in the following way:
Imports System.Data.SqlClient
Public Class Form1
Inherits System.Windows.Forms.Form
[Code]....
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Jun 15, 2011
I'm trying to get bind a textbox text property to an observable collection, and report changes back to the collection. The ContactLog property gets set from the calling page.[code]....
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Feb 17, 2010
Ive already created a connection to my database and by using databinding can retrieve data from the database and display it in a textbox. However i want to keep updating the same textbox at certain times, such as when a button if clicked, with different data but once i try to overwrite the text in the textbox i get this error message. [code]...
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Dec 26, 2011
Me.StuDetComboBox.DataSource = StudentsDet.BindingSource
Me.StuDetComboBox.DisplayMember = "StuName"
ComboBox Bind Programatically Like Above Right ?
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Sep 9, 2010
I have a bindinglist. i am using a textbox to show its itemsWithEvents xBind As New BindingList(Of Emp)
I added items this way
xBind.Add(New emp("alpha0", "B"))
xBind.Add(New emp("alpha1", "B"))
[code].....
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May 31, 2011
for example i have this code :
Sub Month()
Dim Conn As New Data.OracleClient.OracleConnection
Conn.Open()
Try
Dim Cmd As New Data.OracleClient.OracleCommand
With Cmd
[Code]...
What will happen to the datareader when the Connection is closed ( Conn.close)
Will the Cursor that is used by the datareader be freed ? or will it stay open ?
If the cursor that is used by the datareader is still open , when will it be automatically closed ? or should i just closed it manually ?
Will it cause the dreaded "ORA-01000: maximum open cursors exceeded" ?
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Jul 28, 2011
I was thinking I should just change the value to "" when a null value has been read from the datasoure. But then I thought maybe there is a property that allows this. is there?
txtComments.DataBindings.Add("Text", rowEquipItem, "Comment")
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Oct 16, 2010
my code below doesn't work Private Sub DataGridView2_CellContentClick_1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs)
[Code]...
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Jan 6, 2011
i have a form issue and return form. where Issuer_ID is the primary key, this form uses for boht emp and for student issuing book. at run time the user has to select a radio button for student or for employe. if he select student so after entering the full information when he press submit button so student query is execute and data stored in database, keeping the Employee field null, and when user select the employee radio button and after pressing the submit button, so employee querry executes and stores data in employee field, keep the student filed null. remmber and Student ID and Employee ID or foreign keys in isuee and return table and radiobuttons are not the part of database, its just on form.
now i want that when a user gives his issuer ID and at the lost focus event of issuer id, it is checked that if the record exists so the data is bind on the form, if does not exist so the user has to make entry, but if the data loads on form so how user will find out that this data is of student or of employee?
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Mar 20, 2011
I was wondering if there is any way to bind TWO different database tables to ONE textbox in VB? I've spent the whole day going through tutorials and different webpages and I've found nothing at all on this...
Well let me try to explain what I want to do exactly: basically I have multiple buttons on 'Form 1' and a textbox on 'Form 2' asking the user to insert a value which will then go to an Access database. But here is where it gets tricky for me: IF the user presses Button 1, the Value inserted on Form 2 will go to a field in the database whereas if the user presses Button 2 to open Form 2, then the value will go to somewhere else and so on.
This would be easy to do if I was to create multiple forms or multiple textboxes, 1 for each button but what I really need is 1 form/1 textbox that would work for all of them... [URL]
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Feb 21, 2010
i want to read the data from the table to textbo.below is my code when i try to run it it shows the error following are error.IndexOutOfRangeException was Unhandled
Make sure that the max row on a list is is less than list size...
below is the code
[Code]...
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Mar 14, 2009
I am new in VB.NET 2008. how can programmatically bind a textBox to a BindingSource? As I could do that in Vb6 using Adodc in the ff code.
[Code]...
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Jul 14, 2011
I have a DataGridView where we select a line and a new form appears so I can change the data.g:
edit.txtQtd1.Text = DGV.CurrentRow.Cells(6).Value.ToString
edit.txtProd1.Text = DGV.CurrentRow.Cells(7).Value.ToString
The data is loaded from that line to textbox's. everything goes fine, but when I edit the
[code].....
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Jan 16, 2011
I am trying to jump from ASP Classic to asp.net. I have followed tutorials to get Entity Framework and LINQ to connect to my test database, but I am having difficulties figuring out ExecuteQuery(). I believe the problem is that I need an "entity class" for my database, but I can't figure out how to do it. Here is my simple code:
Dim db as New TestModel.TestEntity
Dim results AS IEnumerable(OF ???) = db.ExecuteQuery(Of ???)("Select * from Table1")
From the microsoft example site, they use an entity class called Customers, but I don't understand what that means.
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Feb 11, 2011
I am trying to create a generic typed class, but am running into a problem. Here is my basic class definition:
public class QueueObject<T> where T : System.ServiceModel.DomainServices.Client.Entity
{
public string LoadingMessage { get; set; }
public System.ServiceModel.DomainServices.Client.EntityQuery<T> Query { get; set; }
}
I am trying to add instances of this class to a queue
private Queue<QueueObject<Entity>> _queue;
this._queue.Enqueue(new QueueObject<MyEntity> {Query = MyContext.GetMyEntitiesQuery(), LoadingMessage = "Loading some stuff"});
This doesn't work. I get an error saying that QueueObject cannont be converted to QueueObject. I don't understand because MyEntity inherits from Entity.
Public Class QueueObject(Of T As System.ServiceModel.DomainServices.Client.Entity)
Public Property LoadingMessage As String
Public Property Query As System.ServiceModel.DomainServices.Client.EntityQuery(Of T)
End Class
[code]....
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Jun 13, 2011
Given the following code I get error
"Cannot bind to the property or column rname on the DataSource"
Public Class CustomerUpdFrm
Private RowPassed As DataGridViewRow = New DataGridViewRow ' Passed row variable
Private Sub CustomerUpdFrm_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
[cODE].....
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Jan 15, 2012
I created a table in mySql named 'user' where fields are:
UserID,UserFirstName,UserMidName,UserLastName,Username,UserType,AcctPassword,DateCreated, DatLastModified and IsDeleted.
[code].....
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May 21, 2011
I want to bind a column of my database to my textbox's Auto Complete source.now I want to know How to do that?
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