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Dear Sir and Madam
After I close MemoryStream, how to open it to read again?
MemoryStream m = new MemoryStream();
. . .
. . .
m.Close
How to open it to do the following?
m.Seek(0, SeekOrigin.Begin);
Thank You.
Sorry for bad English.
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A memorystream is like a marriage; once you have closed the door on it, there is no going back.
my blog
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hi all,
I want programmaticly retrieving a list of machine names of the other computers in my LAN ....
how can i do that plz..
ADEL K Khalil
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This has been asked far too many times on this forum. Please search[^] the forums first before posting. Every forum has a "Search comments" link directly above the message board itself and you can even search multiple forums at once.
Microsoft MVP, Visual C#
My Articles
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Hi,
in my program, at the constructor of the main driver class, it loads about 6 DLLs (managed) using the Assembly.LoadFile method and then invoking the needed
methods using reflections functions.
Anyway, when i want to quit the program, sometimes some of the dlls can not be accessed since "they are in use by another program". I've checked the Windows Task Manager and my process do not appear there... any ideas guys?
i thought maybe using Dispose procedure or a destructor. can anyone help me with deciding which road to take? and how?
10x
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Don't know if this will help but I have started taking advantage of the "Using" keyword to automatically fire the dispose method. The feature is specific to C# as far as I know. You have to be sure the type you are using implements the IDisposable or it will throw a compile time error.
public void YourMethod()
{
using(MyObj m = new MyObj())
{
MyObj.DoWhatYouWant()
// Dispose() is called automatically for you when the
// Using block exits
}
}
Good luck and I hope it helps.
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i extended textBox and set its styles to:
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer,true);
to avoid flickering, but now the text i enterd doesnt show in the textbox,
i noticed that ControlStyles.AllPaintingInWmPaint is the cause,
how can i overcome this problem and still avoid flickering?
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First of all, the ControlStyles enumeration is attributed with the FlagsAttributE (and any enumeration in the .NET base class library that is plural always does, as should other libraries when the developers follow naming guidelines), so the three lines (resulting in 3 * 4 = 12 instructions) can be done in one line (4 instructions):
SetStyle(ControlStyles.UserPaint | ControlStyles.DoubleBuffer
| ControlStyles.AllPaintingInWmPaint, true); This is far more efficient.
Second, when you specify these parameters you must override OnPaint and paint the text yourself. The documentation for these UserPaint and <code.allpaintinginwmpaint< code=""> state this.
Third, the <code>TextBox's text is not painted by .NET. Almost every control in Windows Forms (in the .NET BCL) wraps the native common controls equivalent. You should not try to draw these yourself because they aren't not drawn by .NET, but by Windows itself.
Microsoft MVP, Visual C#
My Articles
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Hi
Does someone know a fast method to get CRCs or Hashes of files, in order to compare two files?
thanks
----------------------
Instead of printing "No errors have been found", a compiler should rather print "None of your errors have been found", which would be, in most cases, true.
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Try this[^]Knowlege Base article.
Paul Lyons, CCPL
Certified Code Project Lurker
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Check out the HashAlgorithm.ComputeHash() Method. Open a Stream on the file you want to input and this method will give you the hash.
Note that the HashAlgorithm Class is an abstract class. You probably want the derived class MD5CryptoServiceProvider. MD5 hashes are very reliable for your needs.
~L 
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I get the following message:
The type or namespace name 'Soap' does not exist in the class or namespace 'System.Runtime.Serialization.Formatters' (are you missing an assembly reference?)
On this line here:
using System.Runtime.Serialization.Formatters.Soap;
What am I missing or has something chnaged in .NET 1.1?
(I'm trying to use the BaseSerializable class in this article: http://codeproject.com/soap/soapseraialize.asp )
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I think the answer is in your question:
ABean wrote:
(are you missing an assembly reference?)
According to the MSDN Help for System.Runtime.Serialization.Formatters.Soap.SoapFormatter Class[^] you need to reference the assembly System.Runtime.Serialization.Formatters.Soap (see the requirements section at the bottom of the page)
To add a reference to this assembly in your project right click the requirements node under the project in the solution explorer and select Add Reference... Find the reference to the above assembly and add it.
Does this help?
"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar
The Second EuroCPian Event will be in Brussels on the 4th of September
Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!
My Blog
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I want to add textBoxes at run time into a groupbox (not on the form). How do I get points on the form and into the groupbox
And
How do I disable the right click menu got when right clicking in a TextBox.
(The cut, copy paste.. menu) .
pls help.
_____________________________________________________
Believe! Every thing has a purpose
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To add controls to your groupbox call the Add or AddRange methods of its Controls property.
this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {this.textBox1});
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thanx,
and,
How do I disable the right click menu got when right clicking in a TextBox.
(The cut, copy paste.. menu) .
pls help.
_____________________________________________________
Believe! Every thing has a purpose
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I don't know exactly how to disable the menu.
At first I thought this could be done by setting the ContextMenu property to null but a quick trial showed no success.
Furthermore I can only guess what maybe works.
Try to override the WndProc method of either the form which contains your textbox or of a derivation of the TextBox class. There you may be able to catch and dispose the message which triggers the display of context menu.
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Hi,
I've subclassed two classes inside classA. Theses subclasses are derived from classA. There are some virtual functions in classA with their implementation defined in those subclasses. Client can only see classA. Instances of classA will be created by a class factory. On basis of parameters passed to class factory, the factory creates new objects of subclasses and returns them to client. Following snippet demonstrates the idea.
public class classA
{
/* some non-virtual functions with implementation defined */
/* some virtual functions with implementation defined in subclasses */
internal class subclass1 : classA
{
/* implementation of virtual functions declared in class A */
}
internal class subclass2 : classA
{
/* implementation of virtual functions declared in class A */
}
}
1) I want to run subclass1 objects into COM+ transaction. Is it possible because client never sees subclass1 although it uses subclass1. If possible how ??
2) Is it a good practice to do things this way. The idea behind was to provide client smplicity of using one class while acheiving the logical seperation at the backend for developer's ease.
Thanks in advance,
Regards,
Hatim Ali.
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wot is that an abstract class can do that interface cannot and viceversa ?
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An abstract base class can provide some actual implimentation code, and Interface definition cannot.
Paul Watson wrote:
"At the end of the day it is what you produce that counts, not how many doctorates you have on the wall."
George Carlin wrote:
"Don't sweat the petty things, and don't pet the sweaty things."
Jörgen Sigvardsson wrote:
If the physicists find a universal theory describing the laws of universe, I'm sure the a**hole constant will be an integral part of that theory.
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Is this the only point. Then y did they introduced a new term without one facility.
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Remember that when a new class is defined, it can inherit from only one base class. There are no restrictions on the amount of interfaces that the class can support.
For example, consider the Arraylist Class from the .NET Framework. This class implements four different interfaces: IList, ICollection, IEnumerable, and ICloneable. By using interfaces instead of a base class, a coder may treat it as a list, a collection, an enumerable collection, and a cloneable object, whichever he sees fit.
As another example, consider two classes Amoeba and Dog. Say that Amoeba derives from Unicellular since it is so simple and that Dog derives from Mammal. Both creatures need to Eat(), but because they do so in fundamentally different ways it makes no sense to provide Eat() in a base class common to both. A much better solution would be for them to both implement IMustEat, which forces them to have an Eat() function. IMustEat (an interface) does not define how - or even if - an Eat() method works. All it says is that an Eat() method must exist.
Remember that if not explicitly specified, a class derives from System.Object. The Object Class is very elementary and provides almost no functionality. On the other hand, implementing an interface allows you to make contractual guarantees about your class.
Hope this helps!
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Ok heres the scoop... I'm binding an arraylist of objects to a datagrid. I've got the data to show up by implementing the properties for my object. I've got my datagridtablestyles setup and working right. Things are going good... now I need to know how to add a new row. When I used a dataset with the datagrid there was always a "blank" line at the bottom you could just start typing in. I'm afriad that this was a implementation of the dataset and not the datagrid. So my question. How can I create that same functionality with my ArrayList of ojbects. Or what is my best method of adding new "rows" to my datagrid.
Thanks
Bryan
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Is there a way I can retain the selected values by using checkboxes while navigating between pages in the datagid control?
For eg: If i check one row and i will go to next page of the grid if I come back i want to retain the checked valued with checkbox checked...
I am using normal paging....
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