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They're using the term 'pattern' to mean a recognised structure for class design. See this article[^] for their overview of the "Event-based Asynchronous Pattern".
Basically what they're saying is that the class implementer should consider, for lengthy operations, making available a methodAsync routine which begins an asynchronous operation, and a methodCompleted event to signal that the asynchronous operation completed. The class implementer is responsible for getting the event to fire on the thread that started the operation. You'd normally do this using Control.Invoke or similar.
None of this is a requirement, but it is a design guideline that the framework generally follows and that users of your classes may come to expect.
Stability. What an interesting concept. -- Chris Maunder
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Hi all,
I want some help in Crystal Report for Vs 2005.
I am doing Globalization on Crystal Report using Asp.Net(Vs 2005).
On that Crystal Report I can Get Every data fields in Localized
language (By help of Buisness Object Sapmples)
except Number Fields, Date Fields & Crrency Fields.
Can any one help me to do these fields in Localiaized foramt........
chakkara
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I am trying to use Data Access block V2. I am trying to use stored procedures to manipulate with data. Please tell me the way to pass Input and Output parameters with Data Access Application block.
Thanks,
Sandy Sekhon
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Is there any way to edit a text file without using an intermediate temporary file.
The text file has one entry in each line, and if there are 90 entries i.e. 90 lines, and I need to edit some lines in between (i.e say fro eg the 4th and the 30th entried) without creating an intermediate file. I tried using the FileStream class, it writes only in bytes, and I am stuck as to how to increase the seek pointer linewise.
My code goes like this
System.Text.ASCIIEncoding encoding=new System.Text.ASCIIEncoding();
Byte[] b = encoding.GetBytes("\r\n New Entry \r\n");
fs.Seek(1,SeekOrigin.Current); // fs is the FileStream
fs.Write(b,0,c.Length);
The problem here is in the Seek function, as I need to increment the seek pointer to point to the start of the next line that I am supposed to edit. The above solution is affecting two lines. The required line gets edited but the entry in the next line is replaced by a blank line. And if the '\r\n' is not given then the text is appended to the same line.
Any solutions, Please HELP!!!!!!!!!
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Why don't you work in the storage? Read the file you want to change, change it and then write it back?
Greetings,
Ingo
------------------------------
A bug in a Microsoft Product? No! It's not a bug it's an undocumented feature!
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Hi,
The problem is that i'm doing this for a Pocket PC with a memory capacity of 64 MB and the file can be quite large. Reading all of the data into storage can sloq down the processing speed considerably. This is quite a dilemma i'm in  . Help me out,Guys.
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<br />
<br />
ArrayList alLines = new ArrayList();<br />
StreamReader sr = new StreamReader( "C:\\myfile.ext" );<br />
<br />
string szLine = sr.ReadLine();<br />
while( szLine != null )<br />
{<br />
alLines.Add( szLine );<br />
szLine = sr.ReadLine();<br />
}<br />
<br />
sr.Close();<br />
<br />
<br />
<br />
alLines[ 4 ] = "BLAH BLAH";<br />
alLines[ 30 ] = "MORE BLAH BLAH";<br />
alLines[ 56 ] = alLines[ 56 ].ToString() + " Appended string";<br />
<br />
<br />
<br />
StreamWriter sw = new StreamWriter( "C:\\myfile.ext" );<br />
for( int iCnt = 0; iCnt < alLines.Count; iCnt++ )<br />
sw.WriteLine( alLines[ iCnt ].ToString() );<br />
sw.Close();
Koushik Biswas
-- modified at 16:33 Thursday 2nd March, 2006
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how can i convert a system.string to system.type
Type ct=null;
ct=(Type)Convert.ChangeType("string",typeof(Type));
why the above lines shows error
please help me
chakkara
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If you want to know the type use GetType
Regards
Hansjörg
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string str = "hello"<br />
Type t = str.GetType();
everything derives from Object, which defines the GetType method. So, this also works
int i = 10<br />
Type t = i.GetType();
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TypeDescriptor.GetConverter()
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I assume that you have a string representing a type (like "System.String") and you want the System.Type corresponding to System.String:
Type ct = Type.GetType("System.String", true); // True throws an exception if the type is not found.
--------
"I say no to drugs, but they don't listen."
- Marilyn Manson
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Why the outputs are not the same?
Char[] aChar = new Char[] { 'h', 'e', 'l', 'l', 'o' };
Char[] bChar = new Char[] { 'h', 'e', 'l', 'l', 'o' };
string a = new string(aChar);
string b = new string(bChar);
object c = a;
object d = b;
Console.WriteLine(c == d);
String e = "hello";
String f = "hello";
object g = e;
object h = f;
Console.WriteLine(g == h);
Regards,
Diana.
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because achar and bchar are two character arrays while e and f are two string variables thus they r not equal
reply by
dhamija.manoj@gmail.com
manojdhamija@yahoo.co.in
manoj
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try this one
just change the following lines
string a = aChar.ToString();
string b = bChar.ToString();
now run the program and see the outputs
Regards,
Pramod
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The compiler regognises that the e and f strings are identical, and uses the same value for them. As e and f references the same string, the objects g and h will also reference the same string.
When you compare two object references, they will only be considered equal if they reference the same object.
---
b { font-weight: normal; }
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Hi
You mean all the identical strings will have same reference?
Thanks
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Yes. All string literals that are identical will be reused.
---
b { font-weight: normal; }
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Hello,
I have 2 ComboBoxes on a form which should display the same list of strings.
If I use the same datasource objects ComboBox1 changes with ComboBox2 independend of the DataBinding object
if I make two different datasources I have the problem that only one is updated with the object that they represent...
What is the best way to solve that issue?
Til now I have tested this:
<br />
deviceListBindingSourceCmb1.DataSource = devices;<br />
deviceListBindingSourceCmb2.DataSource =devices;<br />
CurrencyManager mng = (CurrencyManager)this.BindingContext[devices];<br />
mng.List.Add(new DeviceItem("test4"));<br />
In this case the Item is added to devices, but this is not visible in the comboboxes..
Regards
Hansjörg
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anybody know how to code dragdrop in C# asp.net. Any code help or links
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Actually i want drag the name of a person from one data grid to another data grid. How is it possible ?
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Hi, I am planing to do a voice chat software with VoIP. Can you guide me to do that?
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Too vague!
Do you plan to create the VoIP system yourself, or get a third party VoIP and you just control the third party component from your software?
What aspects are you stuck on? What exactly do you need help with?
ColinMackay.net
Scottish Developers are looking for speakers for user group sessions over the next few months. Do you want to know more?
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Yes I am planning to create VoIP system myself. Can you help me to start with ?
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