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Reading the documentation for the DataGridColumnStyle Class[^] would be the best place to start. You might notice it has a Paint Method[^] you can override.
If you don't want to handle all the edits yourself, extend the DataGridTextBoxColumn then just override the Paint method to fix the RTL alignment issues, though to be honest I've never seen any problem with clipping. Do you mean that both the column header and the column data are right-aligned and you don't want the header text right-aligned? Overriding Paint and drawing only the bounds that covers the header text (calling base.Paint for everything else) is the best way to overcome the problem.
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I'd already looked at that example, but the OnPaint for the column is called for each row. Do I have to paint the header everytime a row is painted? Seems like overkill.
thanks,
Deanna
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OnPaint gets called for every row regardless of what you draw. Painting doesn't happen magically on computers. Whenever a portion of the screen is invalidated - or just because the window manager deems it necessary for other reasons - painting is induced. You only need to worry about painting anything when the clipping rectangle includes any portion of your header. Otherwise, just call base.OnPaint and pass it all the parameters that were passed to you so that the base class can paint everything else.
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Hello
i want to install the short cut manager from this http://www.snapfiles.com/get/pocketpc/shortcutman.html site but when i tried to install it the following error occurs on the PocketPc:
Setup-Error
PpcMasters ShortcutsManager
could not be installed.
Please execute Setup once more. (i translated it in english)
Can anybody help me with this problem? - or knows any alternatives?
thanks in advance.
regards
patrick
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If you have a question specific to a project or application, you need to ask the authors of the project or application. Following the link you posted, it was immediately clear that PPC Masters[^] was the author and a link to their web site. Upon clicking that I say Support[^] right away.
These forums are not for product-specific question (most often), and even if you have questions about articles on this site you need to ask at the bottom of the article where there's a message board similar to these forums for that very use.
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This forum is for C#, a language designed for the .NET Framework. You're talking about native C++, so you'll want the Visual C++ forum.
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I was interested in how Microsoft implemented DoubleBuffer (Control.SetStyle(ControlStyles.DoubleBuffer,true)). I found class such as System.Windows.Forms.GraphicsBuffer and GraphicsBufferManager which are used by Control.WmPaint to perform DoubleBuffer effect. I was blindsided that GraphicsBuffer is created each time WM_Paint is received and the memory is allocated by calling CreateDIBSection. I think this is really wasting of resources 
Do you know something about performance cost ?
Wizard_01
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And this is exactly what needs to be done. The secondary bitmap needs to be created each time (or at least cleared, but there's not really any performance benefit to that for simple compat bitmaps). Just because a class is being instantiated in .NET doesn't mean it's a heavy object. Many times it simply encapsulates an HDC or something and contains few to no fields (fields are what consume memory - not methods). The methods are just gravy, so to speak. They act on the fields (or other data passed to them), so if they are wrapping an HDC for a compat bitmap in order to run methods on it (encapsulation), then it's make it easier to use within code. Why duplicate all that code when you can have an encapsulating class handle it. That's what encapsulation's all about.
If you haven't implemented double buffering natively, I suggest you give it a try. This may shed some light on what's going on exactly.
Note that in some platforms and frameworks like DirectX, flipping buffers often yields better performance but both buffers (can be more than two, too) are typically "heavier" objects with transformations tied to them (it greatly depends on how you develop such code), so clearing them after flipping (or before) is better.
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I didnt say its the heavy object but allocation of the memory could be the problem. So what is faster? Alloc 800x600x3bytes or fill the block of memory with zero ? I think the second one.
Wizard_01
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IDGenerator.cs
--------------
public class IDGenerator {
int min, max;
public IDGenerator () {
this.min = 1000000;
this.max = 9999999;
}
public string GetID () {
Random r = new Random(unchecked((int)DateTime.Now.Ticks));
String myNumber = r.Next(min,max).ToString("00000");
r = null;
return myNumber;
}
}</
MyMath.cs
---------
class MyMath {
public static void Main() {
IDGenerator MyGenerator = new IDGenerator();
for (int x = 0; x < 5; x++) {
Console.WriteLine ("Random Number " + x + ": " + MyGenerator.GetID());
}
}
}
I am using above code to create 5 random numbers... however my results are like below:
Random Number 0: 3838931
Random Number 1: 1684909
Random Number 2: 1684909
Random Number 3: 1684909
Random Number 4: 1684909
any idea what is wrong with my code? 
Thanks... 
regards,
vic
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Simple. Your creating a new Random number generator with each invocation of .GetID() and in creating that generator, your seeding the RNG with the current time, in Ticks. What your doing is telling the new random number generator to start with the seed value and generate a REPRODUCABLE string of numbers. What you should be doing in your IDGenerator class is declaring a class level Random, initializing it once, and using it's .Next method on each call to .GetID().
public class IDGenerator
{
int min, max;
Random r = new Random(unchecked((int)DateTime.Now.Ticks));
public IDGenerator ()
{
this.min = 1000000;
this.max = 9999999;
}
public string GetID ()
{
String myNumber = r.Next(min,max).ToString("0000000");
return myNumber;
}
}
Also, random numbers are not guaranteed to be unique during the life of the generator, so review your policies on what this function will acceptibly return. It's entirely possible that it could return the same number twice (or more) in a row.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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The following works for me:
int min = 1000000, max = 9999999;
Random r = new Random();
for(int i = 0; i < 5; i++)
{
Console.WriteLine(r.Next(min, max));
}
- Nick Parker
My Blog | My Articles
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I need to know how to keep the navigation in the same window using the WebBrowser Control. It's NewWindow event does not have the URL in it. I read about SHDocVw.WebBrowser_V1, interface, which has a better NewWindow event, but I don't know how to make the cast from the WebBrowser control in C#. I've noticed that the msdn article on this is in VB. Thanks.
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I’m having trouble finding a clear answer to my question regarding visual inheritance and MDI children. I have made several dialog style forms/apps which were derived from a master template form (dll) – that works great, but I want to take it a step further. My next step was to create a MDI style application using visual inheritance for each child window. Just for information - I’m writing this in VS ver7 (C# base).
So, some questions:
1. Can I make a MDI application into which each child is a based on a master “template” form (dll). My hope is that each child would be its own DLL – easing future modifications and upgrades. Can this be done with .net’s virtual inheritance?
2. If this is possible, is there a way I can dynamically add new children DLL’s (which are visually derived from a master template form) to the MDI application without recompiling the base MDI application (that would be my dream)? Each new child would add new functionality to the core application – but maintain the same base “look”. Obviously this would take some coding, but is this possible?
If you have some ideas, experience, or know of any examples to either of my questions – please feel free to share your ideas.
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rolst5 wrote:
Can this be done with .net’s virtual inheritance?
Do you mean visual inheritence? Yes, it can.
MDI child forms are just that - Form derivatives. So, you can extend the Form class with your own then extend that "template" with other classes. Make sure that any members - including controls - are protected if you want to modify them in derivative classes. These can be in separate assemblies as well, but the assembly that contains the base class must first be compiled before Visual Studio will let you extend it through the visual inheritence wizard.
Also, you cannot have circular references in Visual Studio (it's possible on the command line, but a pain), so define your base class in a separate assembly (project) apart from your main application that defines the MDI parent form.
If you want to dynamically reference assemblies that contain different types of MDI child forms, there's a vast number of articles on this site regarding plug-ins. Just search for "plug-ins". There's a great many ways of locating plug-ins from enumerating files in a particular directory to loading well-defined types from the application's .config file.
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 I am trying to start Excel through code. My objective is to start excel and load a Addin called TM1. If i go in through explorer and click on this Addin(.xla) it connects to a datawarehouse and adds a menu item in excel called Tm1.
Well here is the code that I am using to accomplish the above tasks:
try
{
//create a new excel app.
_newApp = new Excel.Application();
_newApp.Visible = true;
_newApp.AddIns.Add("C:\\Applix\\Integra\\bin\\tm1p.xla","C:\\Applix\\Integra\\bin\\tm1.xla");
_userBook = (Excel._Workbook)_newApp.Workbooks.Add("C:\\Inetpub\\wwwroot\\ExcelAddinExample\\ExcelTemplates\\01_fsTemplate_orig.xls");
_tm1Book = _newApp.Workbooks.Open("C:\\Applix\\Integra\\bin\\tm1.xla",0,false,5,"","",true,
Excel.XlPlatform.xlWindows,"\t",false,false,0,false,null,null);
//try to call the copnnect routine;
_newApp.Run("N_Connect","toad","bisu","GBA03",null,null,null,null,null,null
,null,null,null,null,null,null,null,null,null,null,null,null,
null,null,null,null,null,null,null,null,null);
}
Well my code is failing at the Addins.Add() line. What am i doing wrong.
Thanks for any help.
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sameerhanda wrote:
Well my code is failing at the Addins.Add() line. What am i doing wrong.
That's not very helpful. What exception is thrown? What does the exception message state? What's the stack trace of the exception? Specific information like this is necessary to diagnose the great majority of problems. Always give as much information as possible regarding the problem.
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Software Design Engineer
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The exception thrown by this piece of code is excatly what I said in my previous post:
{"Add method of AddIns class failed" }
and unfortualty the stack trace is not very descriptive either. But here it is:
" at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)\r\n at Excel.AddIns.Add(String Filename, Object CopyFile)\r\n at ExcelModel.ExcelHandler.CreateExcel() in c:\\sameer work area\\excelmodel\\excelhandler.cs:line 32"
I copied this directly from the debugger.
Anyway hope this gives you a better idea.
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sameerhanda wrote:
{"Add method of AddIns class failed" }
That's not an exception. That's the exception text. What was the exact exception type thrown (ex: TargetInvocationException).
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Software Design Engineer
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Heath Stewart wrote:
What was the exact exception type thrown (ex: TargetInvocationException).
Sorry about that..
The excat exception type is ..
{"System.Runtime.InteropServices.COMException"}
Sameer
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Since it's a COMException, the the first thing you should do is suspect the COM server you're calling and look at the documentation.
Having done that, I see two flaws:- The second parameter is ignored if the
Filename refers to a local file (on the hard disk), and CopyFile is a variant of type VT_BOOL (bool), so even if you had to specify it (i.e., Filename refers to a file on a network share, for example) you need to cast it to an object which gets marshaled as a VARIANT (native type):
object copyFile = true;
excelApp.AddIns.Add("filename", copyFile);You don't need to specify the second parameter, however, if you always know the file will be on hard disk. If you know this assumption is safe, then use object copyFile = Missing.Value; instead of assigning a bool.
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Software Design Engineer
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Just wanted to give you a FYI as to how I had fixed this problem..or gotten around it.
int _count = _newApp.AddIns.Count;
for( int i = 1;i < _count ; i ++ )
{
//test to see what is the name of the AddIn.
if( _newApp.AddIns[i].Name.StartsWith("tm1p"))
{
//test to see if it is installed
if ( !_newApp.AddIns[i].Installed )
{
_newApp.AddIns[i].Installed = true;
this._addinIndex = i;
}
}
}
However I will try your method to Heath. Thank's for your responses.
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i'm developing a chat application which allows the user to put smilies in the text box. how can i do this? are there any sample codes? thank you for helping me.
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If you want to display anything more than text, the TextBox is a bad class to extend since it encapsulates the Edit Windows common control and is pretty inflexible. In these cases, most use the RichTextBox, for which you can find many articles about using with chat applications if you search this site or google[^].
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