Forms :: Get Benefit From A Listbox In A Detailsview With A Many-to-many Relationship?
Oct 29, 2009
I'm trying to design a detailsView form which contains [classes] --< [studentClasses] >-- [students] tables. There is a many to many relationship between [classes] and [students] through the third table [studentClasses]. I want to design the detailsView of [classes] such as that all [students] will be listed in a listbox but related students that take the class will be highlighted. And when I select/deselect students from the listbox and save I want the changes to be saved to respective tables.
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Jul 1, 2009
I know I can set IsMidContainer in forms for parent-child relationship forms. I just want to know if the parent form could be a panel. If so, how can i do it?
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Feb 3, 2010
Basically, I am trying to write a LINQ to Objects statement where the relationship is a grandparent, parent, child relationship. (You could also call it a Master Detail relationship.)
Dim coverages As New List(Of Coverage)
Dim coverage As Coverage
For Each rl In oClaimsPolicy.RiskLocations
[code].....
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Feb 18, 2009
What the benefit for Clean Selection in vb.net
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May 12, 2011
I must say personally, the WithEvents system is, shall we say, open to extreme false sense of security, so to speak. I like a lot of automation in my code, and tend to provide ways to do things manually, with a "default" behavior encoded. However, as I have just discovered, the withevents doesn't HOOK the event delegate until after creation. So even when you do New MyObject(), if an event is triggered during the Sub New() process, the delegate hasn't been assigned yet, and thus the event (which in my current situation is extremely important) never triggers. which begs the question the point of the WithEvents other than removing "AddHandler" lines from procedural code. Sure it saves on typing, due to code completion, but if that's it, that isn't much of a benefit. One would think that using the WithEvents would allow me to do:
PUblic Sub New()
MyBase.New()
RaiseEvent MyEvent()
End Sub
Tragically, this does NOT work, which royally screws up my lazy loading techniques and other such tricks that were supposed to make my code simpler to use, and instead has made things 10 times more complex, as I have to specifically alter class initialization sequences to be outside of class instantiation. (which should be one in the same, imho).Jaeden "Sifo Dyas" al'Raec Ruiner
"Never Trust a computer. Your brain is smarter than any micro-chip."
PS - Don't mark answers on other people's questions. There are such things as Vacations and Holidays which may reduce timely activity, and until the person asking the question can test your answer, it is not correct just because you think it is. Marking it correct for them often stops other people from even reading the question and possibly providing the real "correct" answer.
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May 13, 2012
In developing a Windows Forms application (VS2010/VB) with several dozen classes and modules, I seem to have incorporated a variety of Win32 API function variations throughout my application, some of which seem to be duplicative/redundant. For improved code
[Code]....
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Jun 16, 2010
I have a question here.. pls kindly advise.I need to design a simple form that allow user to choose the value from Listbox A to Listbox B. For example, in Listbox A, have value A, value B and value C, then user can choose (or highlight value B and value C) and copy into the listbox B.
May i know how can i do this in vb.net? Any reference link?
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Jan 5, 2012
I have a DetailsView that looks just about perfect. The only thing is, there is one field that actually gets its information from another table. It is an ID field that is linked to another table in the database and I was hoping that there was some way to get that one field in the DetailsView to pull the information from the other table.
Is there a way to maybe add a + (plus sign) next to the PicklistID and then have it show the results of the other query? (SELECT TEXT FROM PICKLIST WHERE PicklistID = @PicklistID???)
UPDATE 1/11/12: The PICKLISTID in the table PICKLIST is not unique or a primary key so I cannot reference it from the SURVEY table. Is there a way to give these 2 columns a relationship so that I can just change my SELECT statement in my DetailsView to include the PICKLISTID?
UPDATE 1/23/12: I'm still stuck on this. I am not getting how to make this work at all.
[Code]...
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Jul 21, 2010
I have the following code in my codebehind Page_Load function that sets the default selected value of a dropdownlist in detailsview based on the name of a record returned from a sql data query.Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
[Code]...
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Apr 25, 2012
I have two dropdown within a DetailsView and I want to work in cascade, the idea is that an area contains various issues and these issues depend on the selected area, but I get the following error: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
[Code]....
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Nov 14, 2011
Just want to ask, can we use multiple objectdatasource in detailsview?
Example, i have 2 different tables with same fields.
Insert, Update much work properly.
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Mar 23, 2012
I have a DetailsView1 control that is databound in many fields but also has fields that I prepopulate upon loading the page for the first time. Example being fields named ROW, FLAG, PRINTED. The user can then input data into the other fields Like FIRST NAME, LAST NAME, COMMENTS and press INSERT. I should also mention that these fields are templatefields.
<asp:TemplateFieldHeaderText="Row"SortExpression="Row"><InsertItemTemplate>
<asp:TextBoxID="TextBox1"runat="server"Text='<%#Bind("Row")
%>'></asp:TextBox>
[code]....
Then the insert of the data begins and creates a SQL record. This works as designed the first time thru.The problem begins when I try to populate the same fields for the next record using the same logic that I used the first time but the fields will not come to the screen populated the second time. What do I need to do in order to get the fields in the DataView1 to be populated after the first INSERT command has cycled thru its process?
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Jun 21, 2011
In this project that I'm creating, I'm creating a mock-up of a page that uses a DetailView (something I saw in a blog) that seems to fit my needs. However, I don't want the data to be bound to anything.So, I added the control and then I started adding the appropriate mock-up columns to it and tried to render the control on the test page. Where the HTML that ASP.NET should generate is nothing.Here's my code (there's a 'real' DetailsView control, then a button and then a blank testing Details view control):
[Code]...
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Oct 7, 2011
I'm attempting to reference the text from a label in a DetailsView in my CodeBehind, then pass it through a Stored Procedure.My DetailsView is DetailsView1, and the two fields are lblDialID & lblCallbackID. I've converted them to TemplateFields. The data is populating properly, but when I'm attempting to grab the data and pass it, I'm not getting any results.The Stored Procedure is not performing it's action, and a Response.Write on the variables does not produce any results so assumedly I'm just grabbing thin air :)
[code]...
Could this also be because I am passing a string, but the SP is taking it as an INT? This shouldn't pose a problem though?
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Jan 25, 2011
When using a scanner to insert into a detailsview the scanner scans and then presses enter. How do I either redirect the enter to be a tab, or just stop the enter key from triggering the insert method?
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Mar 31, 2011
I have developped a usercontrol, but I can't seem to find how to databind on a property of the usercontrol in a detailsview.[code]
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Mar 15, 2011
I have a DetailsView Control but need help with binding, updating and inserting hookup. My code below does not bind and open my DetailsView as I expect it to (either in Edit or insert mode when my page loads.[code]
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Feb 23, 2012
Im trying to do bind a dropdown list to a details view but keep getting an error about the dropdown list ID field:
<asp:TemplateField HeaderText="Approval">
<ItemTemplate>
<asp:DropDownList ID="Approved" runat="server" DataValueField="Approved" SelectedValue='<%#Bind("Approved") %>'>
<asp:ListItem Text="Approved" Value="Approved" />
[code]....
The error message as follows:
'Approved' has a SelectedValue which is invalid because it does not exist in the list of items.Parameter name: value
What is the proper way to attach the value of the dropdownlist to my object so that it can be properly created in the database? Most of my searches keep telling me how to bind a dropdownlist to an object data source, but that is not what I need to do. This is a basic drop down list of 2 items that will never change.
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Aug 10, 2010
When in insert mode detailsview, there are some parameters that I would like to disable or hide. The columns are autogenerated.
Doesn't work:
DetailsView3.Rows(5).Visible = False
or
[code].....
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Oct 18, 2011
Background: I have a GridView which gets populated from an SqlDataSource via DataSourceID. The rows show some summary data from an SQL View. Upon clicking a row, I would like to take my user to another page with a DetailsView control which gets populated with the full set of values from the DB related to the row clicked. My user should be able to edit the data, download files associated with the record, and create a new record of a different type based on said data.
Error: All examples that I've found for Clickable GridView rows end up with some variation of the error Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.
[Code]...
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Dec 12, 2011
I've got a DetailsView which has some static fields defined in my markup and adds some extra fields dynamically in the VB codebehind. It should be noted that the DetailsView lives in an UpdatePanel.Assume that I would like to get inventory information for a number of warehouses, but I only want to see those which have stock on hand. In addition I have some static information such as product, sku, etc.
The problem I was having was that every time I clicked the "Details" button it would just keep appending the dynamic fields to the end and never re-rendering the table. I figure I either need a conditional or to tell it to re-render somehow. I suspect this problem arises from my use of the UpdatePanel but it's important for the user experience of my customer to keep this.
'Warehouse Stock by Location
Dim stockDT As New DataTable
For Each row As DataRow In stockDT.Rows 'Add column for each Warehouse that has stock
[code]....
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Jan 17, 2011
I'm trying to populate a date from a bound text field in a DetailsView. I keep getting a error when a DBNull is in the column. How do I avoid the DBNull when populating the text field.
My code is as follows:
<asp:TemplateField HeaderText="CBYD Clear Date">
<EditItemTemplate>
<asp:TextBox ID="CBYDExpDate" runat="server" ReadOnly="true" Text='<%# IIf(Eval("CBYDDate") is DBNull.Value,"", String.Format("{0:MM/dd/yyyy}", Eval("CBYDDate").AddDays(30)))%>' />
</EditItemTemplate> </asp:TemplateField>
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Oct 13, 2011
I'm simply databinding the data (containing date values) I got with a DataReader as in the following code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim id As Integer = Request.QueryString("id")
'Start connection
[code]....
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Feb 2, 2012
I need to be able to hide 2 options that are displayed from my dynamic bulletedlist (which is built inside of a DetailsView). Every time I try writing a loop through the BulletedList, I get an error saying that it is not a collection type, so I thought I could loop through the DetailsView to find the items I want to hide.
I can't change the SQL because this particular bulleted list gets used on 2 different pages, it's just that on one, I only need to show 2 of the 4 items that are associated with the ID.[code]...
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Mar 16, 2011
I have a DetailsView which has two fields - one that is visible, one that is not. The first the user fills out, the second I want to auto-populate. Unfortunately, I haven't been able to find a way to set the value in this second invisible field. I've tried adding code like this to the Page_Load:
If Not IsPostBack Then
DetailsView1.DefaultMode = DetailsViewMode.Insert
Dim txt1 As TextBox = DirectCast(DetailsView1.FindControl("Type"), TextBox)
txt1.Text = "administrator"
End If
But this returns an error of "Object reference not set to an instance of an object." Any ideas on how to accomplish this - either using the method above or another method?The hoped for end result is that when a new record is inserted via the DetailsView that this record will include the username (entered by the user) as well as the "type" of "administrator"
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Dec 16, 2011
For example lets say I want only admins to be able to see and edit CustomerID in details view, moderators can see this value but it is not editable, and regular users cannot even see it.
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Jan 9, 2011
How to retrieve the particular row of detailsview into textbox on page load event if details view defaultmode is readonly..i want to retrieve the email id from detailsview email row in textbox1 on page load event ?
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May 17, 2012
I use Visual Basic 2008 Database is Mysql Three tables:
[Code]...
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May 15, 2011
I remember we were taught BASIC (Beginner's All Purpose Symbolic Instruction Code) language in school, when we were in 5th grade. It was purely in DOS-Mode and we basically used it for drawing. Then I learnt Visual Basic 6.0 quite a few years basic. I neve found a similarity between them
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Jan 4, 2011
I have two tables which need to be connected using a one-to-one relationship. In SQL Server 2005, how would I add this relationship to the database diagram, do I just leave the relationship blank? Is there any pre requisite queries I have to add? How do I connect these tables in VB? .. the same way I would connect a one-to-many?I need the Student table to be linked to the Class Table where One student can be in only 1 class.
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