.net - Silverlight MaxItemsInObjectGraph Behavior?
Jan 27, 2011
I currently have a silverlight application which has silverlight class library. The silverlight class library has a WCF service reference which works as expected for small data. However we have come across a problem which is caused by the default value of maxItemsInObjectGraph. We have tested it with an increased value (called from vb app set in behaviour) and it works however we are unsure how to set the value of maxItemsInObjectGraph when it is in a silverlight class library (as it is only defined in the clientconfig file and no services are added to the client). I have seen posts about adding it to the web.config but this only seems to apply when the service is called directly by the app not by a class library?
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Mar 19, 2009
I have a LOB app written in VB.NET with a WinForms front-end and SQL back-end. After many months weighing up how to get onto the Web, I decided last month to use Silverlight 2. Now, Silverlight 3 Beta is out, but there is no end-user runtime.
Does anyone know when the runtime will be available for deployment of SL 3 apps onto client sites?
My dev timeline is about 3 months: should I persist with SL 2 and then u/g to SL3, or jump straight in to SL3?
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Jun 14, 2011
How to use a .Net 3.5 Behavior in WPF .Net 4?
I get this error when I use .Net 3.5 in .Net 4:
Found conflicts between different versions of the same dependent assembly
I can solve problem with double click on that warning but it doesn't work in design view (It works for building well).
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Jun 29, 2011
I'm writing an in-house intranet application in ASP.NET and VB.NET. My 'customers' are beginner to medium-level users. All of our browsers are IE8 and above, standard.The application works great, except for one thing. The backspace key. When a user types an invalid number into a textbox, a RegularExpressionValidator and ValidatorCalloutExtender fire off and notify the user. Perfect. Except that, when the user closes the popup warning and notices the cursor is still flashing in the textbox, he/she feels it's time to hit the backspace key and delete that pesky field value.
Unfortunately, the browser interprets this action as a desire to go 'back' into the page history. My boss is screaming. His bosses are screaming. I have a headache.So, how can I turn off this behavior? I still need the backspace to eliminate characters in the textbox, but nothing else. Company policy here: Backspace is to delete characters from the screen. Nothing more, nothing less.
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Jul 8, 2011
Strange vb.NET application behavior/One application e.g. does some recursive operations against a ftp server as it synchronizes a local directory with a remote directory. When this part is finished, recursively I loop through the local directory to compare each individual file with a hash code table file retrieved from remote to be sure the source file and the destination file are identical. The processing speed to me during the coding was really satisfactory, but all over sudden the all over performance has been reduced by factor 3. So what happened was I closed an application named TeamSpeak. As you can guess it took me a while to figure out what was happening. This behavior is reproducible even with other applications like Outlook or Winamp?To make it short: e.g. TeamSpeak is up and running, my application runs 3 times faster than without TeamSpeak up and running ... same code - no changes !!!
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Sep 10, 2010
I have a combobox in a Windows form. I set the properties of the combobox as follow:
AutoCompleteMode: Suggest
AutoCompleteSource: ListIems
DropDownStyle: Simple
DataSource: some binding source
Problem when user enter value to the textbox and open the dropdown and filter out the dropdown list. When user mouse click an item in the dropdown list, it will not select the item and paste it to the textbox. User uses the down arrow to navigate to the item and click on the "enter" key and it will not paste the selected item to the textbox. The only way to select an item is using the down arrow key to navigate to an item and then "Tab" away and it will paste the selected item to the textbox.I want to be able to use mouse click or "enter" key to select an item from teh dropdown list.I want to set the DropDownStyle as "Simple" so user can think it is "textbox" and start entering value to it.
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Oct 15, 2009
how to negotiate a dataset via:
For Each dRow In quanDS.Tables(0).Rows
'do something to each row
Next
I now need to figure out now to loop through a subset of the records returned in the dataset - here's a VB6 example I need to convert:
strSQL = "select * from tblDQ order by xid, xcode, xDOS"
rsMaster.Open strSQL, conDB, adOpenDynamic, adLockOptimistic
rsMaster.MoveFirst
[code]....
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May 18, 2010
My program shows some browser. From a browser user can open maximized MDI form with some report. When user is closing the report, first MDI form with browser is became maximized.
2 forms have same MDI parent. Can I change this behavior to leave my first browser form without maximizing after second report closed?
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Jan 28, 2010
I have an issue where a ComboBox control will change it's Text value when it is resized. Here is some sample code that I worked up:
Option Explicit On
Option Strict On
Public Class FMain
Private Sub FMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
uxComboBox.DropDownStyle = ComboBoxStyle.DropDown
[Code]...
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Jul 26, 2011
I am primarily a C# developer; however, I am currently working on a project for a client who preferred VB.net. I have managed to switch over fairly well, with one frustrating exception. When editing a C# file in Visual Studio pressing enter will select an item out of the IntelliSense window and keep the cursor at the end of the selected statement.
However, when editing a VB file, pressing enter selects the item out the IntelliSense popup AND moves the cursor to the next line. I realize that this is a small thing, but it drives me crazy, because it makes it really hard to switch between C# and VB projects.
I have searched for everything I can think of in Google and found nothing. Does anyone know of a way to change the IntelliSense selection behavior?
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Mar 22, 2009
I have a userControl (.NET 1.1 Winforms) that has a clickable picturebox as a button.Since I have lots of those usercontrols visible at the same time, I thought It could be nice if I just display the picture box when the mouse is over the usercontrol and hide it otherwise.To do so, I handle the MouseEnter and MouseLeave events of the UserControl, hiding and displaying the picturebox. That works fine.But when the clickable picturebox is visible I'm not longer able to click it (the hand cursor is gone and the click event is not firing).After some test, I realize that if comment all content on the MouseLeave handler that do something with my picturebox... this way the picturebox is clickable.I'm not using the correct event?
Here is the code...
Private Sub NodoEstablo_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.pictAdd.Visible = False
End Sub
[code]....
Update:If I resize the picturebox on MouseLeave (just to do something) it works.So far, changing Visible and Location in the MouseLeave prevent me for click the picturebox.
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Jun 27, 2011
I have an unbound datagridview control whose first column is a combo box This contains a list of part numbers.I am having some problems with the datagridview automtically adding a new row when the combo box item is selected.If I select an entry from the data by typing in part number in full in the first row and pressing tab or enter then I get a new row created. No problems.However, if I then START typing a part number in the second row AND click on the part number in the list that is suggested then I DO NOT get a new row.However, if, on the first row I START typing a part number AND click on the part number in the list that is suggested I DO get a new row.
My code is as follows:
Private Sub dgOrders_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles dgOrders.EditingControlShowing
Try
[code]....
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Jul 28, 2010
an application from VB IDE (Debug mode) that application run correctly.If I run the same application from EXE (Debug Mode) that application fail.For accuray:I debugged this application (EXE) usin DbgView.exe and I see that the error is in the Application.Doevents.When the application.doevents occurs, the application stop for a long time than restart after long time or if i send some CTRL + TAB on keyboard.
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Mar 6, 2012
i have a application based on Visual Basic platform.. where Enter key action as Tab key ,, which ease the enter key to move from field to field, rather than the tab key.. its works perfectly in Winxp ... but i'm having problem in Windows7 ultimate..
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Nov 16, 2011
I have noticed that the immediate window in VS 2010 behaves differently when debugging a C# project and a VB.NET project, although I haven't been able to find any specific documentation of this difference.
For C# projects, I can simply type in any expression, and it will be evaluated and displayed, i.e.
[Code]...
All other expressions exhibit the same behavior, including simple math such as '1 + 2'. Sometimes the error message is different though, as 1 + 2 results in the error 'Labels that are numbers must be followed by colons.'Is there a way to 'fix' this behavior and make the VB.NET immediate window behave more like the C# one? Having to type a ? in front of every statement can be a pain when using it frequently.
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Jul 26, 2011
The MyClass keyword behaves like an object variable referring to the current instance of a class as originally implemented. MyClass is similar to Me, but all method calls on it are treated as if the method were NotOverridable. I can see how that could kind of be useful, in some specific scenarios. What I can't think of is, how would you obtain the same behavior in C# - that is, to ensure that a call to a virtual method myMethod is actually invoked against myMethod in the current class, and not a derived myMethod (a.k.a in the IL, invoking call rather than callvirt)?
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Mar 10, 2010
I'm using the following to read a serial port. When run it displays the data correctly but stepping through the program I find that it loops through the serialdatarecieved event for each character of the port input rather than reading all of it. So _msg only equals one letter at a time. I'm trying to set a variable equal to the entire input stream but only get one character of it.The end goal is to capture all of the data available on the port when the event triggers so that this data can then be processed. I tried using the bytestoread function, which gets the correct number of bytes to read, and then looped through to read a byte at a time but that didn't seem to work as I expected either. It just kept reading the first byte.
Imports System.IO.Ports
Public Class CommTest
Dim WithEvents SerialPort As New SerialPort
[code]....
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May 21, 2010
Why might my GetRawData declared function return a correct value when called from my VB.NET application, but return zero when called from my ASP.NET page?The code is exactly the same except for class type difference (Form / Page) and calling event handler (Form1_Load, Page_Load).
Note: In the actual code, #DLL# and #RAWDATAFILE# are both absolute filenames to my DLL and raw data file respectively.
Note: The DLL file was not created by Visual Studio.
Form1.vb
Public Class Form1
Declare Auto Function GetRawData Lib "#DLL#" (ByVal filename() As Byte, _
ByVal byteArray() As Byte, _
[code]....
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Jan 11, 2011
I'm creating a windows forms program and have recently noticed a large amount of memory slowly being eaten by the application. I went through my program and tried to tie up as many loose ends as I could in relation to object creation but noticed that the program would still keep memory for every form loaded until it eventually crashed.
I decided to make a simple test program which sole purpose is to pop-up a new form with a few controls, wait for 200 milliseconds, then close the form and repeat the process 30 times every time I hit a button. I found it caused the same behavior, even with the only new object creation being that of the form. So, I decided to manually invoke the garbage collector in a subroutine which handles the formclosed event. During tests I would get some memory back occasionally, but not enough to make a difference in the long run. So I start setting the form variable to nothing before I called GC.collect(). The program will initially eat a few 1000K of memory before leveling off and using only 20-40K for every 30 forms created.
Now what I'm wondering is, what is the point of an automated garbage collection system if it requires constant manual evocation and explicit dereferencing of all new objects to be effective? Have I completely lost grasp on the scope of VB.Net forms and it simply never marks forms as available memory to be cleared?I would have thought object memory references created within a form would be marked as usable when the form's close or dispose routine is called and no references to objects created within the form exist anywhere outside the closed form.
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Dec 31, 2009
I am developing an application in Visual Basic under Visual Studio 2008 Professional. As part of this application I am using a third-party ActiveX control (.ocx file). After building the installer (.msi file) using the deployment tools in Visual Studio, I tested it on a clean system. The install appeared to run successfully--folders are created, files are copied, and the .ocx is registered. However, when I tried to run the application I received an error telling me "You must have a license to use this ActiveX control." This would be expected on the development machine, but should not happen on the client system, i.e., in the runtime environment.
On previous builds of the application, I did not receive this error. Besides updates to the application itself (the part I created, that is), I was using NSIS to create the installer, rather than the tools in Visual Studio. The application cannot run without the .ocx in question, so this error is a show-stopper.
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Jan 12, 2010
In a base class object, I have an overridable subroutine that I would like all derived objects to have the ability to include. However, they don't have to, and if it's not necessary for them to use it, I don't want them to be forced to declare it. To enforce this, I've left the default behavior empty. For example, here's my whole sub:
Protected Overridable Sub MySubroutine(ByVal someObject As Object)
End Sub
Is this bad practice? I don't want to declare it as MustOverride, but I don't want default behavior. Is there a "better" way of doing this, or is this perfectly acceptable? I don't want to be that hack programmer...
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Sep 23, 2010
Any variable of type Nullable<T> can be assigned to null. For instance:
int? i = null;
At first I couldn't see how this would be possible without somehow defining an implicit conversion from object to Nullable<T>:
public static implicit operator Nullable<T>(object box);
But the above operator clearly does not exist, as if it did then the following would also have to be legal, at least at compile-time (which it isn't):
int? i = new object();
Then I realized that perhaps the Nullable<T> type could define an implicit conversion to some arbitrary reference type that can never be instantiated, like this:
public abstract class DummyBox
{
private DummyBox()
{ }
[code]....
But this seems to imply that there is a custom implicit conversion from Nullable<T> to object:
public static implicit operator object(Nullable<T> value);
This is clearly not the case as object is a base class for all types, and user-defined implicit conversions to/from base types are illegal (as well they should be).It seems that object x = i; should box i like any other value type, so that x.GetType() would yield the same result as typeof(int?) (rather than throw a NullReferenceException).
So I dug around a bit and, sure enough, it turns out this behavior is specific to the Nullable<T> type, specially defined in both the C# and VB.NET specifications, and not reproducible in any user-defined struct (C#) or Structure (VB.NET).This particular boxing and unboxing behavior appears to be impossible to implement by hand. It only works because both C# and VB.NET give special treatment to the Nullable<T> type.
Isn't it theoretically possible that a different CLI-based language could exist where Nullable<T> weren't given this special treatment? And wouldn't the Nullable<T> type therefore exhibit different behavior in different languages?How do C# and VB.NET achieve this behavior? Is it supported by the CLR? (That is, does the CLR allow a type to somehow "override" the manner in which it is boxed, even though C# and VB.NET themselves prohibit it?)Is it even possible (in C# or VB.NET) to box a Nullable<T> as object?
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Jan 5, 2011
consider the following code and comments:
Console.WriteLine(1 / 0); // will not compile, error: Division by constant zero
int i = 0;
Console.WriteLine(1 / i); // compiles, runs, throws: DivideByZeroException[code].....
This test seems to corroborate the idea and a literal double of 0.0 is actually a very, very tiny fraction which will result in Infinity...
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Oct 12, 2009
I've tried to implement directory listing using the Webbrowser component, I dont need much, just to display some directories, be hable to click them and then be hable to see its contents and be hable to see the images and files inside. the problem is, the default behavior of the webbrowser component is, any directory link you try to click. it will inmediately make either IEXPLORER or MS Explorer to run (in a new window) and open the directory. I just want the webbrowser component to let navigate freely on directories. What can I do to implement this? Just to Clarify: I just want webbrowser to open the directories and files IN THE SAME WINDOW and to not run the MSexplorer like it does by default.
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Apr 15, 2011
I have to use a round method that follows this behavior:
7.00 -> round -> 7
7.50 -> round -> 7
7.51 -> round -> 8
I tried to use Math.Round, but it works a little bit different.
[Code]...
How can I implement my rounding logic?
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Aug 19, 2009
If I have Debug.WriteLine method in my code, do I need to comment all these methods before producing the Release version? Or does the compiler just ignore them?
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Nov 10, 2011
I want to be able to define in my web.config the type of connexion my object will use to get data (variable) (from an xml or from a databases). I though about using a Strategie Pattern, but I'm somewhat stuck by the need to write somewhere the name of the class, which I do not want. [code]I have the class Context which has a IContext member (called _context). The Context class reads (through ContextConfiguration) app.config.I want _context to be able to be a ContextXML or a ContextDB... or a ContextJSon or any other new class that would implements IContext.
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Jun 28, 2011
Private Sub TimerSaveonemessage_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TimerSaveonemessage.Tick
Dim Checkifsended As String = ""
If Checkifsended <> FixNummber(MessageToTextBox.Text) Then
[code]....
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Dec 10, 2009
I have a treeview with Imagelist assigned to it. I find inconsistent behavior with the Images being displayed in treeview. When I run the app sometimes the images show up and sometimes they don't.
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Jan 15, 2012
I have an application which has a tabcontrol that contains two tabpages. I have a custom made usercontrol docked to fill up each of those tabs. When I resize my main form to the minimum size allowed one tab resizes accordingly while the other seems to overflow the area and a couple ui items slip out of access/view.
One usercontrol was quite literally copied from the other and renamed and fields adjusted. The usercontrol size is the same between the two. Within the usercontrols there is a datagridview and a large panel full of textboxes and they have identical sizes and identical anchoring properties and even the same location coordinates.
I'm struggling to find a difference between the two but I really would like the resize behavior to match between the two usercontrols. I was wondering if anyone would have ideas of other things to check I did not mention here?
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