Bill Burke's Q&A profile

• Visual C# how to return null from a constructor

  say, i a m trying to do something like: class something something(streamreader){ if (wrong format or end of file) caller receives null as result else build object from what has been read in file } i tried 'return null', but it says it can not do that since a constructor is 'void', so i can not place a return sentence. i'm not sure something like this.dispose would retunr a null, since the 'dispose' may be asynchronous (or something) i have the next alternative class something blah blah somehting(string) (build object from string, check if string==null or wrong format before calling) static bool checkformat(string) check to see if string is adecuate to build somet ...Show All

• Visual Studio Express Editions invalid exception " "Invoke or BeginInvoke cannot be called on a control until the window handle has been created."

  Hi all i have a project in vb.net some times at run time this message appear InvalidOperationException was unhandled {"Invoke or BeginInvoke cannot be called on a control until the window handle has been created."} i don't know why and i didn't find any logic when it's appear because when i run my project some time its appear and some time it doesn't appear. i read alot of articals all of them talk about thread and UI but i didn't use thread in my project , i used alot of select statments, insert and update to the data base , for loops , show forms and show dialogs . please how can i fix this problems and how can i know where is the problem. this is the details of the exception System.InvalidOperationE ...Show All

• Audio and Video Development Microsoft Windows XP Media Center SDK - Issue in playing audio file

  Failing to play an audio file while using the method available in Media Center SDK as follows. It works at first attempt, but fails second time while trying to play an audio file. oAddInHost.HostControl.PlayMedia(Microsoft.MediaCenter.Extensibility.MediaType.Audio, <path>, false); But it works fine while added the same file to the queue. Any suggessions for the same Thanks, Suresh. Try posting your question here: http://www.microsoft.com/windowsxp/expertzone/newsgroups/reader.mspx dg=microsoft.public.windows.mediacenter Becky ...Show All

• Visual C# Events not raised on singleton property

  I have a Class, Data. This class contains several BindingLists, implemented via encapsulation. This class is a singleton, which is implemented on the following manner: private static Data _Instance = new Data (); public static Data Instance { get { return _Instance; } } Now, when i add an event listener in another class to a bindinglist, using Data.Instance.Projects.ListChanged+= new ListChangedEventHandler (Projects_ListChanged); This event is never raised. However, when I ditch the singleton pattern, and make all properties static, the event IS raised. What did i miss here Why does the event not get raised on the above implementation Thanks in advance! ...Show All

• .NET Development Button Event Inside User Control Not Firing when Dynamically Created and added to Page.

  Hello, I am dynamically Loading multiple instances of a UserControl and adding them to the Page.Controls collection. When I run the page the dynamically created Usercontrols are displayed with the proper data. However, when I click a LinkButton I have included in the UserControl to hide certain elements within the User Control the Page Posts back but the LinkButton.Click event does not fire inside the User Control. Further, if I just hard code the user control into the aspx file (giving me just the one instance) and I click the LinkButton the Click event does fire inside the user control. Therefore the problem is related to me dynamically creating multiple instances of the UserControl. Here are some differences in the Rendered HTML/S ...Show All

• Smart Device Development Hands On Lab Code

  I have looked all over for the accompanying .msi installer for the the Microsoft HOL titled "Step by Step: Developing a SQL Mobile Application with Visual Studio 2005 and SQL Server 2005". Can anyone tellm me where I can download the file from so that I may do the lab Thanks! No, there is a mobile database script that it asks you to run during the step by step. I've been looking for the code too, but haven't been able to find it. ...Show All

• SQL Server SqL Trace query

  Dear All, I have set Miimum Trace Duration to 400 microseconds in VSTS .. however the current application that I am testing Interacts with Oracle as well as SQL Server , through the same stored procedure .. Brief Idea of functionality : Step 1: Insert into Sql Server Table ... if success Step 2:Insert into Oracle Corresponding Table .. if success .. Step 3: update Sql Sevrre again .. if success Step 4: Send mail through DB .... In such a scenario could u suugest the Trace Duration for every step as every step is a diffrent DB component.By Trace duratio i mean how much time should each step take to run efficiently. Hi, I am not certain which part of VSTS you are using, but I do n ...Show All

• Windows Forms designer for custom webcontrol

  I have posted the following in the ASP.NET forums but no one seems to have an answer and I'm hoping that someone here can help as it is more of a designer question than it is an ASP.NET question: I have the following custom server control (complete source code below) to create a very simple rollover image hyperlink and it works just fine. The problem is that when I select the images, they do not render in the designer (I am using Visual Web Developer), only the dreaded "red-x" appears. What do I need to do/add to give the control full designer support 1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Text; 5 using System.Web.UI; 6 using System.Web.UI.WebControls; 7 ...Show All

• Visual Studio Express Editions Displaying Double DataType Numbers into DataGridView

  Hello VB Gurus, I encounter such problem in my datagrid view. It won't allow me to display the whole real number values (i.e, 12.645) it will only give me a value of 13. I set the data type from my Access Database as Double. I also use a double type variable in the code. I also checked the property of the DataGrid View to display double data type. Please help me find any possible solution. thanks Sure you can select the column and modify the DefaultCellStyle property to format the text in whatever way you want. You can change format, colors, alignment and a host of other things. ...Show All

• Community Chat Media Player 11 TV Tuner?

  Hi I love media player 11 but there is a major drawback it cant watch TV. I have a USB TV car but i have to use arcsoft totalmedia to play the TV is there anything to make the media player pick up the card and play the freeview Or is there any websites or software or plug-in stuff to allow media player to watch TV over the internet Luke. hmm ya i think you have to pay to get a 'few' channels on MCE hardly acceptable really they should make a 'freeview' free to watch over the internet. thx for the try anyone else know something more Luke. ...Show All

• .NET Development .NET Framwork 3.0

  After I install .NET Framework 3.0 update from MS site, I am unable to open my McAfee security center. I can’t even uninstall it from Control Panel (nothing happens when click change/remove button). Anyone knows why TX After a series of trials and errors, it is NOT the .NET Framework 3.0 update that causes the problem, it is the Root Certificate update for IE 7 that disables the McAfee Security Center and blocks internet access. Don’t download the Root Certificate update for now. ...Show All

• Windows Live Developer Forums Map Control: What is legal?

  We are having a bit of trouble understanding the legal stuff for Virtual Earth. What we want is a very small internal system that simply displays a map with pushpins/custom icons. The system has a very small number of transactions daily. By internal system, we mean used by 3 people internally in a company. The site must not be accessible to the public. Can we do this free, or will we have to purchase a license   TroelsL wrote: We are having a bit of trouble understanding the legal stuff for Virtual Earth. What we want is a very small internal system that simply displays a map with pushpins/custom icons. The system has a very small number of transactions daily. By internal system, we mean used by ...Show All

• .NET Development question a xml file attributes?

  Hi all, [C# 2.0] I'm trying to loop through an XML (resx) file & display it to a DataGridView ... but I want to disregard items that start with '$' (already done that) or contain type attributes. nodes to accept: <data name ="blah"> <value> "foo" </value> <comment> "bar" </comment> to ignore & continue to the next one: <data name="w_SelectedIconTool.Location" type=" System.Drawing.Point, System.Drawing, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b54df5d54dd" > <value>17, 17</value> </data> and <data name="w_SelectedIconTool.Location.ImageStream" mimetype=" application/x-microsoft.net.object.binar ...Show All

• Windows Forms Changing DataGridViewButtonColumn's Button Text Per Row

  I have an unbound DataGridViewButtonColumn and I want to change the text on each button(each row) during the load of the grid or on specific event. How can i do that thanks Shaul DataGridViewButtonColumn btnCol = new DataGridViewButtonColumn (); btnCol.Name = "btn" ; this .dataGridView1.Columns.Add(btnCol); for ( int j = 0; j < this .dataGridView1.Rows.Count; j++) { this .dataGridView1[ "btn" , j].Value = "btn" + j.ToString(); } ...Show All

• SQL Server I want to create link with 2 servers

  I want to create link with 2 servers is that possible to do that. for example is like this, ---------------------------------------------------------------------------------------------------------------- SELECT Products.ProductID, Products.ProductName, Products.CategoryID, Categories.CategoryName FROM [SERVER1].[Northwind].[dbo].[Products] INNER JOIN [SERVER2].[Northwind].[dbo].[Categories] ON [Products].[CategoryID] = [Categories].[CategoryID] -------------------------------------------------------------------------------------------------------------------------------------------- Products table has SERVER1 and Categories table has SERVER2 Y ...Show All