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Hope this helps
public void Clone_Example(PaintEventArgs e)
{
// Create a Bitmap object from a file.
Bitmap myBitmap = new Bitmap("Grapes.jpg");
// Clone a portion of the Bitmap object.
RectangleF cloneRect = new RectangleF(0, 0, 100, 100);
PixelFormat format = myBitmap.PixelFormat;
Bitmap cloneBitmap = myBitmap.Clone(cloneRect, format);
// Draw the cloned portion of the Bitmap object.
e.Graphics.DrawImage(cloneBitmap, 0, 0);
}
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ok now if i want to draw cloneBitmap in a particular position of a pictureBox how can i do?
Becouse i've tryed to do this:
pictureBox1.Image = cloneBitmap;
and it draw nothing while pictureBox1.Image = myBitmap; yes
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OK I've found the problem!
I load a png file so i can't execute the cutting.
I don't know why but if i load bitmap and i try to cut it it works!
Someone can tell me why?
How can i do about using png files?
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hi there.
iam developing an application but i don't know how can i make my application upgraded by adding some new features to it ? how can this be done theoritically anybody here has an idea how can i make my application after finishing it to add new features by upgrading like accepting new dll files from my website of this application like any famous programs ??? any body here as an idea about that
Miss With The Best And Die Like The Rest
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When I wrote my firs (and only  ) "self updating" program, I use teh following method:
- I create a static string in teh code for the version number
- I create a folder in my website in the folder there is a textfile called version.txt contains only one line, the current version number, and int his folder also in the new verson of tehe .exe and a nother file called updater.exe
- when my app starts meka a web request, and read the version number from the version.txt and if it's not same as the number in the exe:
- download the updater.exe, and run it
- the updater.exe close the real app, and download the new app.exe from the web
- then start it, and close themselves
- now, the new version is on the machine, and run
Perhapes the app delete the updater.exe from the computer, vhen finishing the update 
I know It's a crazy, nd maybe stupid way, but when I do this I haven't a better idea, and It's work fine 
But the exper CP aunthors shud tell you a better way :->
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You have to design your application to be "easily upgradable" at the first place  Take a look at Razor Framework[^].
David
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I am using image streams to set the images of my toolbar.
If I close the streams, I get generic GRI+ error. On the other hand
if I dont close them, the error is resolved.
Any ideas?
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Straight from MSDN Image.FromStream docs:
Remarks<br />
You must keep the stream open for the lifetime of the Image object.
I created a Bitmap helper class that copied the bytes to MemoryStream and managed the Bitmap from there. Here are some of the methods of the class:
public void Load(Stream sm)
{
Clear();
int len = (int) sm.Length;
byte[] buf = new byte[len];
sm.Read(buf,0,len);
_ms = new MemoryStream(buf);
_bm = (Bitmap) Image.FromStream(_ms);
}
public void Load(string fileName)
{
FileStream fs = new FileStream(fileName,FileMode.Open,FileAccess.Read);
Load(fs);
fs.Close();
}
public void Load(object dbField)
{
Clear();
if (dbField != DBNull.Value)
{
byte[] buf = (byte[])dbField;
_ms = new MemoryStream(buf);
_bm = (Bitmap) Image.FromStream(_ms);
}
}
public void Clear()
{
if (_bm != null)
{
_bm.Dispose();
_bm = null;
}
if (_ms != null)
{
_ms.Close();
_ms = null;
}
}
public Bitmap Bitmap
{
get {return _bm;}
}
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I've been poking around the web for a solution to this and perhaps I'm not looking in the right place, so I thought I'd post the question.
My C# Form prompts the user for a username, password, and domain. I'd like to verify that these values are the same as the currently logged in Windows user. I can get the Username and Domain name from the Environemt class, but I need to verify that the password given is correct as well.
Any help out there?
never mind I found it....
DirectoryEntry de = new DirectoryEntry("WinNT://"+Environment.MachineName+", computer",txtUsername.Text,txtPassword.Text);
try
{
Object o = de.NativeGuid;
this.DialogResult=DialogResult.OK;
}
catch(Exception)
{
this.DialogResult=DialogResult.Cancel;
}
finally
{
de.Close();
}
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I don't think it's an easy think, because as I know windows make his own hash coding for the password and store it in a hidden system folder.
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I don't care what the password is, I just want to validate it. The code snipet I included works....problem solved. Thanks for you reply though.
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OK!
I understand, you only want to validate, but I think (till now) the password file is prtected by the OS.
Would you kind to send, or link the snipets for me, It's interested me.
Thanks 
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Look at the code in my original post....it works.
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Hi all.
Casting problem here!
If I have the following code:
<br />
Type classType = typeof(MyDerivedClass);<br />
MyBaseClass o = Activator.CreateInstance(classType) as MyBaseClass;<br />
...<br />
o.SomeFunctionInDerivedClass();<br />
This all works fine and splendid. But if I have this code in a function, and I want to, at runtime, decide on the type of class being instantiated, how do I do the 'as' keyword explicit cast? I'm using 1.1 so can't use templates/whatever they are called.
TIA
Gizz
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If the type of the class is decided at runtime, then you can't have code like
o.SomeFunctionInDerivedClass();
either. What you'd have to do is use reflection to invoke methods, something like
object obj = Activator.CreateInstance(passedType);
obj.GetType().InvokeMember("SomeFunctionInDerivedClass",...);
Of course, the type you instantiated might not have an "SomeFunctionInDerivedClass" method, it'll then result in an exception and you have to handle it. That's the price to pay for reflection, you lose compile time type safety.
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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I'm trying to get an idea of where to start looking for info on doing this or if it's even possible:
I'm working with VistaDB and it doesn't support Unicode yet. They claim that text is stored as "Ansi" only. Let's say I have a Unicode string and want to store it into a text field in their database.
Is it conceivable that I can convert that string to something that will store in Ansi (may well be unreadable gibberish at that point, no problem) then de-convert it back to unicode upon retrieval?
I.E. take the 16 bit unicode characters from UTF-16, split them out into ANSI (which I'm guessing is good old single byte 8bit characters) save it and later retrieve it and reverse the process?
"A preoccupation with the next world pretty clearly signals an inability to cope credibly with this one."
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Off the top of my head, you'll probably have to encode the Unicode string into something more 8-bit friendly, like Base64. Yeah, that should work... convert the Unicode string to an array of bytes (Convert.ToByte()), pass that through the Convert.ToBase64String() method. You could then store the encoded string in your database. Just reverse the process to get it back out.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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 I never thought of that. I was thinking of some wizardry with UTF-8 or UTF-7 encoding and decoding, but that would work as well.
Thanks for the suggestion!
"A preoccupation with the next world pretty clearly signals an inability to cope credibly with this one."
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Found it, for the elucidation of others it's dead simple:
//Convert to ascii 7 bit text for saving to a database that doesn't support unicode:
//(or smtp or whatever)
string u="Hindi: यूनिकोड क्या है?";
string encoded=Encoding.ASCII.GetString(Encoding.UTF7.GetBytes(u));
//which ends up looking like this:
//"Hindi: +CS8JQgkoCT8JFQlLCSE- +CRUJTQkvCT4- +CTkJSA-?"
//Converting back to unicode:
string decoded=Encoding.ASCII.GetString(Encoding.UTF7.GetBytes(u));
What's interesting is that apparently it delimits every string of text that contains characters outside the ascii code range so when you have a mixed string as above of English and Unicode it's more efficient to do it this way than to base64 the whole thing because it will only do the bits it needs to which is what applies in the app we're working on that will often contain mixed text.
"A preoccupation with the next world pretty clearly signals an inability to cope credibly with this one."
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That's cool. I never had to deal with a case such as yours. Your solution is definately better than mine.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hey everyone,
I need a way to look at a compiled assembly and determine what variable types are allocated during a method call. Is there a way to do this in .NET, possibly using reflection? I've got an enterprise level application that uses a number of objects that implement IDisposable. Some of the coders have not been disposing of these objects when they are finished with them. I need some way to track down the methods where this is occurring. Any ideas?
Will
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Look here: http://www.aisto.com/roeder/dotnet/[^]
It is just the best "reflecting" and decompiler program - a must-have!
You can explore the code and resources of any assembly in (almost) every .net language you want!
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I hope this question don't win "The Most Stupid Question Of The Day" prize,
but I was just wondering if there is an easy way to import the macros from some
C header files (like CommCtrl.h) in C#. Cause they're very handy and the WinForms
controls don't provide all of the functionality of the Windows Shell controlls.
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