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Well, the problem is that I fill a dataSet and in some functions I change the informacion of its Tables, but letter I want to return the data of one Table to the dateBase that it procced.
It's important because with it I'll only make two requests to a DataBase, to take the information and to put new information.
Thanks...
.............................
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please make your question more clear as i dont understand!
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See the DataAdapter derivative classes. You can use DataAdapter.Update (so long as the InsertCommand, UpdateCommand, and DeleteCommand properties are assigned) to update the database. If you plan ahead, keep the instance of the DataAdapter that filled your DataSet with fully-assigned properties that can fetch and update data.
Microsoft MVP, Visual C#
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Hi,
Can someone please help me, I have spend many hours trying to solve the problem...
I have an inherited TextBox control to which I added a custom bool property with Bindable(true) and DefaultValue(false) attributes. Using the IDE, the property is bound to a column in a Table within a DataSet. The databinding works fine.
The problem, during the form layout the 'Set' accessor of the property is mysteriously called with 'false', which seems to set the 'IsEdit' flag on the CurrencyManager for the row, forcing an update of the row while no data has actually changed.
Is there a way I can prevent this from happening?
Yours Sincerely
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Both BindableAttribute and DefaultValueAttribute are design-time attributes. They will not do anything for you at runtime. The former is used to put the property directly in the "Bindings" catagory instead of having to click on "..." in the "Advanced" design-time property. The latter is used by the designer to know when to serialize the property value and when not to. The specially named ShouldSerialize<PropertyName> is also helpful for this.
If your property is getting set mysteriously to false, put a breakpoint in your code and examine the stack trace. That will tell you what caller is calling your set accessor.
Microsoft MVP, Visual C#
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Thanks, I will try your suggestions.
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Hi, is there anyway to make a TrackBar Control transparent? Ive tried all sorts of thing like for example:
this.SetStyle(ControlStyles.SupportsTransparentBackColor | ControlStyles.Opaque, true);
this.BackColor = Color.Transparent;
And I've tried setting the WS_EX_TRANSPARENT extended style:
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= WS_EX_TRANSPARENT;
return cp;
}
}
None of which works. Does anyone have any suggestions for me?
Thanks, Dan
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From MSDN for SupportsTransparentBackColor :
The control accepts a BackColor with an alpha component of less than 255 to simulate transparency. Transparency will be simulated only if the UserPaint bit is set to true and the parent control is derived from Control.
Have you set it to true?
Mazy
"Man is different from animals in that he speculates, a high risk activity." - Edward Hoagland
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Thats no good, if I set UserPaint the Control will become invisible because its expecting me to paint it.
Dan
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maybe you can just call the default paint function after setting the transparency of the tool bar ?
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Is it possible to embed a .chm file as a resource and display a help window using it? I have a small app and I'd like to have a few windows that display some info using html. I thought .chm would be the easiest way to go. I found another solution on the web which uses an active X control to use IE, but it doesn't seem to work in a multithreaded apartment... which this app is. Any ideas?
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Why not just distribute it like every other program and library without embedding it. Talk about a waste of space and expensive load times. Besides, in order for hh.exe (the HTML Help viewer) to load and display it you'd have to extract it anyway unless you host the ActiveX controls, get an IPersistFile implementation to read your embedded resource stream then go to a lot of work with interop to read it. Talk about a useless mess! Just distribute it as a separate file like every other program.
Microsoft MVP, Visual C#
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I just didn't want people to be able to accidentally delete it and cause a problem. But I see now that if the file is missing, nothing happens.
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If people start deleting any of your files, they will invariably break something. Same goes for any program. They shot themselves in the foot - you didn't pull the trigger. Up until Windows XP with system file protection enabled, users could easily hose their systems doing the same thing. There's nothing you can do besides charge them extra for luser support.
Microsoft MVP, Visual C#
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Hello to All!!!
I have a small problem.I need know if the CapsLock( NumLock ) is pressed on the start of my app.I mean that it no if it is pressed actualy but is "turned on".
Thanks...
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You should be able to check that with the System.Windows.Forms.Control.ModifierKeys[^] property.
John
"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.
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That only works for modifier keys, for which Keys.CapsLock does not apply.
Microsoft MVP, Visual C#
My Articles
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See an old post[^] to a similar question. Keys.CapsLock does not count as a modifier key so you need to get the actual key state. The link above shows you how to P/Invoke GetKeyState and call it (don't worry about calling native functions - many of the classes in the .NET FCL - especially all the Windows Forms controls - already do it...a lot).
Microsoft MVP, Visual C#
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Hi,
I'm just starting to learn C#(and I like it) and .NET Framework, and I stared with this: I want to make a chat application. Basically, I have a server and a client, connected via sockets (all works just fine). Now, I would like the client to send some info to the server -> a serialized object (because there are many types of values in this object). The problem is that the server and the client are not the same application, and thus, deserialization doesn't work (or at least, I couldn't make it work...maybe you can help here).
This is the code I use for serialization:
MemoryStream ms = new MemoryStream();
StreamingContext stmCtx = new StreamingContext(StreamingContextStates.CrossMachine | StreamingContextStates.Persistence);
BinaryFormatter bf = new BinaryFormatter(null, stmCtx);
bf.AssemblyFormat = FormatterAssemblyStyle.Simple;
bf.TypeFormat = FormatterTypeStyle.TypesWhenNeeded;
bf.Serialize(ms, negociate_struct);
...and then I send ms over the network. Now, serialization is basicaly ok (because if I deserialize here ms, is works fine), but on the server I got this IOException : "File or assembly name RCClient, or one of its dependencies, was not found." RCClient is my client application name. I also saved my stream to a file, and got something like:
" ˙˙˙˙ RCClient %NegociationStructures.NegociateStruct
SenderTypePacketNo
NPResponse xxx " It's obvious my server application doesn't know who RCClient is.
I figure the problem is either with setting the BinaryFormatter, or I use the wrong tool for the job. Also, I can't use SOAP serialization, because I noticed that the stream is much larger, and I need as much speed as possible (this should eventually develop into a video chat & stuff).
I hope I made my problem clear, and I would appreciate any help or hint.
Thank you in advance,
Doru K.
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dorutzu wrote:
"File or assembly name RCClient, or one of its dependencies, was not found."
That indicates that your server application doesn't know how to find the type information for the object that your client sent over. To fix this, move all shared classes into a "Class Library" (dll) that both the client and the server applications use.
John
"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.
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You should also read How the Runtime Locates Assemblies[^] in the .NET Framework SDK.
Serialization does pack-up your object graph (your RCClient in this case) but it needs to deserialize it back into an instance of that class so it's still required on both ends. As the previous post mentioned, put all shared classes in an assembly that both the server and client can access and make sure it can be found.
Finally, you might want to look at .NET Remoting. It serializes data in an extensible manner (i.e., you can specify whether or not to use the binary, SOAP, or a custom formatter, and whether or not to use the HTTP, TCP, or custom transport channel) and marshals it across the wire. This also opens your application up for a good AOP (aspect-oriented programming) model so that you can intercept methods and log them, encrypt them transparently to the method calls in your program, etc. Basically, you're already doing the very basics of what Remoting is, but you'll find that Remoting is a proven, extensible, and tested implementation. Read Accessing Objects in Other Application Domains using .NET Remoting[^] also in the .NET Framework SDK for more information.
Microsoft MVP, Visual C#
My Articles
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Thank you very much for your answers. I took the easy way, and just bundeled everything in a .dll for both applications to use it...and it works just great! And it was so easy...
Thanks again!
Keep in touch,
Doru
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Hey!
I have a picture(GIF) with a figure on it, it have a transparent pattern so al around this figure will be transparent.
Now this works fine if i just have this transparent picture in a picturebox right on the form, it will get the foms bakground color as bakground under the transparency.
But if i want to have a a Image as bakground and then have a picture box on top of it that contains the Gif picture(figure) then it will not show the forms bakground image in ti transparent area, instead it shows the color of the form.
Is there any way to have a picture box with a Gif above another picture and then get the bakground bickture to show throw the transparent area of the top picture(gif) ??
//Jimmy
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Why not just draw the image onto the form without the PictureBox, that way you don't have to handle the background color of the PictureBox.
- Nick Parker
My Blog
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