ComboBox / Binding / Display Member & Value Member
Aug 31, 2011
I know I have done this before and as I remember it should be really easy. But for some strange reason I can't do it now and I am about to jump off the building.I will make it simple:Two tables, one is just a list of products and their code.The other table: "details" has a field named product. I want to store only the code there.In the second table's entry form, I am putting a combobox. This combo box should display the list of products, their names, but depending on which one is selected, the code is what is passed to the table "details". Currently If I set the display member to product and the value member to code it still pases the product to the binded data source.
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Jan 14, 2012
I have been battling with this problem for months with virtually no success. I am using Visual Studio 2008 Professional. The database is Microsoft SQL 2005.
I have two combo boxes - both bound to database tables. These are: Combo box 1 is for "VAT" and is bound to the VAT table. This table has 3 columns configured as shown below:
[Code]....
The commented out code was my pathetic attempt to put the Value member of one combo box into the display of the other. This obviously does not work and my web browser, when using Google, is full of purple headers showing the sites that I have visited looking for an answer.
When I have this working, I want to use the feature in a datagridview which may make a difference to how the problem is approached.
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Jun 2, 2011
how do I overcome it? I have created a class and compiled into .dll This code
[Code]...
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Aug 13, 2009
In Visual Studio 2008, if I do this:
[Code]....
Does anyone here know how to get the above to work WITHOUT warnings being generated?
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May 31, 2010
In the following code i get a warning at line 59:Warning 1: Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.and.. At line 78 I get this Warning:
Warning 2 Property 'SelectedCustomer' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
The program compiles and runs well, but i cant' undesrtand the reason for these warnings. Any Idea ?
1: Public Class Form1
2:
3: 'Form level members
4: Private objCustomers As New ArrayList
[code]....
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Jan 6, 2011
I have 2 tables Table A & Table B Table A has the table values that I want to be populated in a datagridview control.The challenge is that column 1 in table A contains an ID(foreign key) to a name field that is a located in table B. I need the datagrid to have the first column be a combobox that displays the names(from Table B) that are already in table A via the ID's, but reference the populating values from Table B. So that when you bring down the combobox you would be choosing from Table B data but populating table A with the ID and you would see a name there instead of an ID.[code] How do I populate my DS dataset with Table B? And how can I create a link to these two tables using a bound datagridview control?
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Apr 28, 2011
Cannot appear to be able to get this function to not have the above error.Private Function GetIncidentActions(ByVal FromAgentID As Integer, ByVal ToAgentID As Integer, ByVal incidentAction As Integer, ByVal ActionDate As Date) As String
[Code]...
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Dec 6, 2010
I have a database that holds information about a particular job. One of those things is a customerID. CustomerID links to another table containing customer details. I have a combo box attached to a custom object that holds customerID as the valuemember and CustomerName as the displaymember.The JobDetails holds the customerID info. How do I set the default selection in the combobox based on the ValueMember of the combo box?
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Jul 15, 2010
I'm trying to concatenate two combobox display member values using the following code
Dim CB2DM As String = ComboBox2.DisplayMember
Dim CB1DM As String = ComboBox1.DisplayMember
TextBox8.Text = Join(CB2DM & " " & CB1DM)
I keep getting an error.
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Nov 18, 2009
I'm "cloning" objects in my code. For instance: objClone = objOriginal My question is: Does the assignment operator in VB.NET 1.1 do a member-by-member copy of the objOriginal to objClone or does objClone simply point as a reference to memory referenced by objOriginal?
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Jun 23, 2009
i changed a class variable to shared so i can access it in all instances of the class, but it caused an error. what is causing this, and how can i fix it?
Private
Shared img As Bitmap
Me
.img = bgImage
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Jan 3, 2011
I get this error if I follow these steps: Change property Y of an object (an associated entity property)
Attempt to submit changes At this point the value of Y and the value of X (the underlying key) are not in agreement -- LINQ to SQL apparently doesn't synchronize these until GetChangeSet is called.An expected error occurs due to some business logic or database level constraint during the update operation.At this point the value of Y is in agreement with X because GetChangeSet was called.Change the value of Y to Nothing (aka null).Call GetChangeSet.
The error occurs on the last step because the value of X and the original value of X (returned by GetOriginalEntityState) are different, and the new value does not agree with Y? Is that why? Is this a bug in LINQ to SQL. Must be because I don't see the same behavior if I change Y to another (non-null) value instead during step 5. What's the right way around this? I can see a few ways:
Discard the DataContext when an error occurs and leave the UI as-is. I don't like this because then optimistic cocurrency change conflicts cannot be detected. The new context doesn't have the original values in it that were populated at the same time the UI was populated, so if the UI has any stale values in it, they will cause data in the database to revert.Refresh the datacontext (OverwriteCurrent) and leave the UI as-is. I don't like this for the same reason as #1.Refresh the datacontext (OverwriteCurrent) and re-populate the UI. I don't like this because then the error message just presented to the user does not show the user the error they made and allow them to correct it. It also discards all the other changes the user may have made.When the error occurs, explicitly retrieve the key for Y that corresponds to the original value of X and reset Y, then call GetChangeSet to re-synchronize X (X is read-only or private so I can't reset it directly). This seems to work, but seems like a hack, and may require lots of code for other similar errors.
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Dec 28, 2009
Let's say I bound a combobox to a datatable. How can I get the valuemember of the currently selected item in the combobox (for example, when I have to save the data, I need to get the valuemember - PatronTypePK - of the currently selected item in cmbPatronType)? And can anyone check if I made the code correctly or if there are any programming practice errors/inconsistencies? I wanted to fetch two tables into a single dataset (Patron, PatronType). Do I have to make a datatable for each, or can I simply use the dataadapter?[code]...
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Apr 4, 2011
in VB.NET you implement an interface like this...
Sub SomeInterfaceMember()
Implements ISomeInterface.SomeInterfaceMember
End Sub
while in C# you do it explicitly like this (which can only be called via the interface)...
void ISomeInterface.SomeInterfaceMember(){}
or more simply, implicitly like this...void SomeInterfaceMember(){} // Note the name matches the interface member However, regarding VB, I can also do this...
Sub SomeRandomMemberName()
Implements ISomeInterface.SomeInterfaceMember
End Sub
In other words, the method that handles the implementation can have a completely different name than the interface's member name.I'm just wondering if there's something similar to this in C#. (Yes, I know I can simply do an explicit interface, then access it via another 'wrapper' member with a different name that simply delegates to it, but in VB.NET?
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Aug 11, 2010
How should i find the index of the value member in an combobox?
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Oct 3, 2011
how can i get value member of gridview combobox column? i am displaying product name in combo and want to access selected value of combo on my form to assign pproperty
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Sep 12, 2011
I have an app which hangs in production periodically more frequently on some PC's than others. While trying to resolve this I have started to analyse the application using WIndows native debuggers, such as ntsd,which appear to throw up a large number of clr exceptions (first chance). While alot of these are handled in my code some appear to be related to issues with Windows binding. For example the exception' Cannot bind to the new display member' appear to occur when I assign a BO to the datasource of a bindingSource control while if I directly set the datasource of a UI control, which would have referred to the bindingSource, the message disappears.In all cases I would have the displaymember and valuemember set for my list controls before updating the bindingsource control's datasource.
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Dec 19, 2009
I've set my DisplayMember property of the listbox to the property I want yet when I add the objects to my listbox it "fails" and instead uses the .ToString of the entire object which doesn't return what I want.
[URL]
the DisplayMember only works if your listbox has a datasource. Well I'm not using a DataSource, like that guy I'm just using .Add. So how do I get DisplayMember to work without using a DataSource?Also I tried putting all of the objects (their simple item structures) into a List Of and then set that list as the DataSource to the ListBox and it actually added all of the objects to the listbox however the DisplayMember still didn't work and all I got where the results of Object.ToString().
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May 30, 2012
I have a small problem. DataGridViewComboBoxColumn display value from ValueMember and not from DisplayMember. The grid work fine and when I select somthing from this column I see DisplayMember value but when focus lost the grid show ValueMember. I have this code combo box column:
statusCBoxColumn.DataSource = dt 'datatable with two fields StatusId and StatusText
statusCBoxColumn.DisplayMember = "StatusText" 'is type NVarchar
statusCBoxColumn.ValueMember = "StatusId" 'is type Int
[Code]....
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Jun 30, 2011
I actually have three combobox bind to diffrent table. and I got such the error in my title. Bellow are my codes:
myCommand = New SqlCommand("SELECT (FirstName +' '+ LastName) AS FullName FROM tblVisitor", myConnection)
myAdapter = New SqlDataAdapter(myCommand)
[Code].....
Through this code, i got only the first comboboxthat display the query result, but the other two do not, and display the message 'Cannot bind to the new value member. Parameter name: value'.
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Jun 10, 2010
i made a class which has speed,symbol (string "*") and location what is the acceptable way to actually display the class symbol property on the screen ?the class will be stored in a list<OF T> and will contains hundreds dynamically instances
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Jan 21, 2012
I have been battling with this problem for months with virtually no success.
I am using Visual Studio 2008 Professional. The database is Microsoft SQL 2005.
I have an unbound datagridview with two combo boxes � both bound to database tables. These are:
Combo box 1 is for VAT and is bound to the VAT table. This table has 3 columns configured as shown below[code]...
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Nov 16, 2011
I have a combo box that is populated with a list of objects (corresponding to all employee rows from a database that meet the criteria IsTech). These are not entity objects though, I have created my own class that stores the member values of each row from the DB. I have set the DisplayMemberPath to EmployeeId so the Combo box display the EmployeeId ( an integer ) member of my object. Ie. right now there are only 2 IsTech employees in my DB so the combobox displays the numbers 3 and 8 ( their EmployeeIDs).
[Code]...
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Jun 12, 2010
I have created a class called 'MyAddress' and in the form load event i am adding few objects of that class to the combobox. I want to know how should i set and read the values of the member variables of that selected item of the combobox. I have tried this and is working, but i am not sure whether it is the way to do
vb
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code].....
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Feb 10, 2009
I am using .net 2008. I have placed a ComboBox on the form and I do not have an additem.
[Code]...
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Oct 11, 2011
I received this function to get groups a user is member of.
Private Function GetRoles(ByVal user As String) As String()
Dim propertyCount As Integer
'Initialisation du tableau avec 10 String ""
[code]....
, it displays only one line with a String[] Array value.
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Jun 15, 2010
I am trying to display my data in datagridview. I created a class with different property and used its list as the datasource. it worked fine. but I got confused how to do that in case we have nested class.My Classes are as follows:
class Category
property UIN as integer
property Name as string
[code].....
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Jan 26, 2011
I'm working on this big project in MVC ASP.NET w VB.NET One of my views is getting me headaches since a few and i'm not sure what's up. I've used the Begin.Form and Html.Encode methods alot in my other views and i never had any problems. Now this new Create.aspx view for one of my object called Automation is giving me multiple build errors such as those cited in the title plus
Error 184 'Context' is not a member of
'ASP.views_automatisation_create_aspx'.
BeginForm is not a member of 'Html'
[Code]....
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Jul 18, 2009
I have a class with two properties:
code:
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Aug 30, 2009
I am using Visual Studio Express 2008 and I am working with datasets. I have made a form. Then brought in my customer detail from my Customer Data Set. Also from that same dataset I brought my orders into my form. then I went to the code view and had to edit some lines. the following is the code that I have. I am going through Beth Massi Form over Data Series videos.
Public Class Form2
Private Sub CustomerBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CustomerBindingNavigatorSaveItem.Click
Me.Validate()
[code]....
I am getting the following error:
'CustomerAdapterManager' is not a member of 'Form2'
and ' OrdersAdapterManager ' is not a member of 'Form2'
I have been watching the videos from Beth Massi, Forms over Data video series. I am on lesson 3.I just can not see where this problem is occurring.
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