VS 2008 - Shadow The Item Property Of My Collections To Retrieve The Actual Data?
Oct 6, 2010
I am trying to solve an issue in my application where the following exception is occurring: there is already an open datareader associated with this command which must be closed first. I am using TableAdapters, which maintain their own DataReaders, and everything seems to work fine unless I am interacting with one of my background workers.
In my code, I shadow the Item property of my collections so that I can retrieve the actual data from the database if needed. Here is a sample:
[code]...
Now each reference to the Item get property instantiates its own DataAdapter, so I am confused as to how the same DataReader will ever be used in this scenario. Is there something I am missing? All the TableAdapters do in fact use the same connection object, but I wouldn't think that would be a problem
I am using the following code to load an ArrayList with an object. [code]I don't know how to retrieve the object from the ArrayList using the Item property. I am using the following withOUT Success. The code is searching the arraylist for a match on serial number. Values(2) is correct and is working fine - the problem is purely getting the object information from the arraylist.[code]How do I pull the propertys back from the object in the arraylist to compare the values with Values(2)?
I have a listbox with several list items added. I want that as user click on an item, I should be able to show its property. This should change for different items. For example (hypothetical) : Listbox has numbers 1 - 10. Now when I select 1 I should be able to set property - Name, Lastname, Colour, Age.
When I select 2 I should be able to set - Age, Hair Colour (clr shows), Weight, Date. When I select 3 then - City (combo box drop down), Country, Age only. This way value changes for diff items. One way is to put them in property grid and show them. Though this looks nice but adding/removing items in that is not easy. You need to have a class that refer that to prop grid. Do I have to code for each classes for all values in listbox or is there an easier way to manage items in property grid. If you think prop grid is not the right tool for such an activity then can you suggest something else.
I need to retrieve the actual text of a message box from another application. When using WM_GETTEXT, the values returned are the title of the message box, and the text of the control button (in this case "OK").
My issue is that what I really need is the actual text message from the box itself. I've been researching this for days and can't find a way to do this. Nothing I have found so far tells me how to do this.
my .net app output data from sql server to a datatable in my app using executreader.for example:one of the column size in sql server varchar(40),actullay the field only contain 2 chars (like: "AB" for example)when it executes into datatable,it display in the column like "AB" <<this chars + white space = actual size of the column,but I want only the size of the data only, which is "AB" when I export it as csv file the field is >> "AB?
I am building a real estate website. I have a table for properties (i.e. "houses"), a table for pictures, a table for features, etc. So each property's data comes from three, not only one table. I need to provide a function that retrieves requested property data depending on a search criteria, for example:
Public Interface IHasDateUpdated Property DateUpdated As DateTime End Interface Public Class MyClass
[code]....
Now, assuming I was referencing an instance of MyClass as an IHasDateUpdated; how would I determine the actual name of the property that implements the interface property via reflection?For example:
Dim x As IHasDateUpdated = New MyClass()
' How do I derive "MyDateUpdated" from "x" using x.DateUpdated?
Does anyone know of a control such as a Checked List Box where each item can have a value against it.For example you have a list of fruits and in the listbox it displays Apple, Orange & Banana but the values for those items are A, O & B.
If i wish to put items into a System.Collections.Generic.Dictionary, I can either Add or set the Item.I know if you do Add it helps you check if the key already exists and if not it throws an exception.Now I'm curious, so if I'm adding a ton of items, should I prefer setting Item instead of Add since Add does unnecessary checks that may actually slow things down?
How can I have it so that you can add items to a System.Collections.Specialized.String Collection but only if it is not there already? I have already found the code, but deleted it and cannot remember it. It is something like[code]....
I need to be able to tell if a property is of type List(of T)but am currently unable to. if i do
TypeOf (UpdateTo.GetType.GetProperty(node.Name)) Is System.Collections.Generic.List(Of Object)
I get the following error
TypeOf (UpdateTo.GetType.GetProperty(node.Name)) Is System.Collections.Generic.List(Of Object) Expression of type 'System.Reflection.PropertyInfo' can never be of type[code]......
I am trying to change the image in a picture box using a combobox with item collections 0-8.When I run the program no matter what I choose in the combobox it selects case 0 and willnot change. code below for selected index changed.
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e
in what situation will an item in System.Collections.Generic.List not be removed successfully?url...The way they phrase it makes me think that it is possible that a Remove operation on an item found in the List(Of T) could actually fail.
I am using a Hashtable which stores unique names and objects associated with those names. Now those objects have a property called "IsDynamic" and some of them have it set to false whie some of them have it set to true. So when I retrieve any object using the key property, it goes to find me that object. How do I override that find method?
I have a weird question and I honestly hope you understand what is happening here: I design my form (using VB.NET) and put on it a few textboxes, comboboxes and a listview. After the design, I want to adjust the TabIndexes for each control on the form. On the right-hand side of the interface is the property box.
I then select the 'TabIndex' property item and enter a number key (for instance 0) for that selected item. I then select the next textbox control and enter the next number (for instance 1) WITHOUT re-selecting the 'TabIndex' property item. As soon as I select the combobox or listview control, the currently selected property item jumps to 'Items' or 'Collections' and does NOT remain on the 'TabIndex' property item. Why is this happening? Everything worked fine and all of a sudden this starts happening. Should I reset the editor settings or how can I resolve this matter?
I want the DisplayMember property to be the property name to display for whatever kind of custom collection (persons, cars, etc) I have bound to the AutoCompleteBox.
I don't think I can modify the datatemplate programmatically. Is there a way I can do this with binding (relative source)?
It seems that the autosize columns will only make them bigger. For example, if I have a DGV that fills most of the form and then only three small columns are loaded, there is a whole bunch of darkgrey empty space. Is there any way to snap the side of the DGV to the actual data?
I wanted to create a custom control with a custom Item-Collection in it.(Similar to the ListView Items, but with other properties)I wrote a Class that holds properties of a single Item data (ClassItemData) and another class that "Inherits System.Collections.ObjectModel.Collection(Of ClassItemData)". The Collection class contains a public event (ItemCollectionChanged) which is raised when "ClearItems", "InsertItem", "RemoveItem" or "SetItem" is called. (I used "Overrides" on all these functions and added the Raise Event to them.) The event is handled in the custom control itself and causes the control to refresh/repaint itself. The collection class contains also "Default Public Overloads ReadOnly Property Item(ByVal index As Int32) As ClassItemData" which returns the Item at the speciefic index.
The control refreshes itself when I place the control on a form and use code like: ControlName.Items.Add("TestItem") Unfortunately the control does not refresh itself when I use: ControlName.Items.Item(0).Visible = False The value of the Item itself has changed after this, but the control does know about the changes and does not refresh itself. If I do a manual repaint/refresh of the control, it looks all fine, but it does not work automatically. Does anyone know, what I have to add, so I can handle an event or something in the control when a property in the ItemData class has changed? How do I recognize changes in existing items and raise an event in the custom event?
in my on the job training i need to develop a program (webinterface in later stage) that is able to work with the volume shadow copy service.after about a month of research i have found about nothing about how to program it using the sdk or something like that.so now im asking on forums if there is anyone who has experience with using it in own programs.so what does it have to do?first i would like to be able to get information about a volume that uses VSS. information like how many copy's were made, when were those copy's created. what files are included in the copy.my prefered langauge is C# but im not affraid to learn (more) about VB or C++
on my Bookings program i've got a listbox where i can select the booking date of each room, and then i can see the details "UserID, time start time end etc". When the UserID is read from the database it takes the user id number (which its supposed to) but now i want to take that number, and match it to the actual "User Name" and then display the Name.this is what i've got so far;
Dim BookingDetails As New SqlCommand("SELECT UserID,......(and the rest)
then i execute the reader
Dim drBookingDetails As SqlDataReader = BookingDetails.ExecuteReader
and then i'd want to convert the read data, into the actual user name?
When I move or copy files, I'd like to know how to show the actual progress of the data transfer.Something that I don't understand is how when moving or copying files to detect the actual progress of the data transfer. I always put the moving/copying in a background worker and that does fine, but presently I can only report status based on how many (of the total) files have been moved or copied.I've tried to look at the destination and my thinking was to report the progress based on the bytes there, but that doesn't work because it always sees it as being the complete file's size, even though that makes no sense.In fact, if you copy a file using Windows Explorer, it does the same thing, although obviously it's still transferring.
I used to be a web developer in vb.net 2008 , now i get involved in some projects with application development. Which is the right way i mean the proffesional way to connect to database , syntax a query and bind the result to datagrid?I see 2 ways , the first is using the wizard i mean drag to the form the databinder from the toolbox and follow the wizard step by step , the second way is the same way i used in web development i get the connection string from app.config , syntax a query inside my code and follow manually steps to retrive the data from a database.which way to use for a large application projects?
I wanted to create an event that when I hit a button, it will check if the webbrowser has reached THISPAGE.html.
If webbrower1.Url.toString = "thispage.html" then 'this line may have been webbrowser.Url.toString("thispage.html") cant remember I tried both ways neither worked. do something End If But I get a null exception error.
My other question is , is it possible to pull data or text from a website like through the webbrowser control thing and place it inside a textbox or label or something like that?
