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C# has many more features than J#. Enums, property syntax, shorthand event declarations (compared to J#), structs, etc.
Having to continually convert between J# 'primitives' and .NET types is really a pain (i.e., 'double' is not identical to System.Double in J#). You must pass .NET types to .NET methods, but they return J# 'primitive' types in J# - you'll never get used to this quirk...
David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB.NET to C# Converter
Instant VB: C# to VB.NET Converter
Instant J#: VB.NET to J# Converter
Clear VB: Cleans up outdated VB.NET code
-- modifed at 21:09 Wednesday 7th September, 2005
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I want to retrive the selected row into a datagrid, and afther andding more rows to the control (through the datasource), to select the previous retrived row.
I retrive the row with the BindingContext property... but how can I select it in the datagrid with new datasource?
I hope I understand...because is a rough world out there...
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how can i get the serial number of any kinde of hardware(i.e. HDD,CPU,RAM,graphic card,..etc)
for example in delphi, i use the GetVolumeInformation() to get the serial number of HDD.
so is there such function or class can do this..
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I have a multithreaded app which creates several objects. Inside the object class is something like:
public ArrayList Associations
{
get
{
if(this.assocs == null)
{
lock(this)
{
if(this.assocs == null)
{
this.assocs = new ArrayList(500);
return this.assocs;
}
}
}
else return this.assocs;
}
}
Is this kind of lazy initialization safe to do in a multithreaded environment?
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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I'd use single locking:
<pre>
public ArrayList Associations
{
get
{
lock(this)
{
if(this.assocs == null)
{
this.assocs = new ArrayList(500);
return this.assocs;
}
return this.assocs;
}
}
}
</pre>
unless performance testing shows you need to do double locking, then you need to add a memory barrier,
<pre>
get
{
// use lazy initialization to create the associations:
if(this.assocs == null)
{
lock(this)
{
if(this.assocs == null)
{
ArrayList result = new ArrayList(500);
System.Threading.Thread.MemoryBarrier();
this.assocs = result;
return this.assocs;
}
}
}
return this.assocs;
}
</pre>
You can also make assocs volatile instead and use the double locking.
<a href = "http://blogs.msdn.com/brada/archive/2004/05/12/130935.aspx" rel="nofollow">http://blogs.msdn.com/brada/archive/2004/05/12/130935.aspx</a>[<a href = "http://blogs.msdn.com/brada/archive/2004/05/12/130935.aspx" target = "_blank" rel="nofollow">^</a>]
<hr><div style="font-size:xx-small;font-family:arial;color:grey;"><font size=1> I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon</font></div>
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I was concentrating on your lazy initalization question so much, I missed the bigger issue. You can't just expose a dynamic array list to multiple threads.
Use
this.assocs = ArrayList.Synchronized(new ArrayList(500));
instead.
I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon
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Actually, your other post answered the question; I used ArrayList as an example only, my actual code uses a custom List<MyObject>.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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Hi, i made a windows service, i added the service installer, the service process installer, etc..Then, i did the installer and installed the windows service. It appears in my add/remove programs window, but it DOESNT appear in my Services window, so i cant start it or stop it, or whatever..Does anybody know why? what am i missing? thanks
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Did you make sure to put the [RunInstaller(true)] attribute above your service installer class? Also, make sure you close and re-open the services window, since it will cache and not notice things sometimes.
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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Does someone have experience reading WM_INPUT info? I already know I need to use user32.dll, I only have no idea HOW. There are masses of tutorials in c or c++ on this subject, but just a few in C#. I'm a programmer newbe, so I like code with some explanation 
Thanks in advance.
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Can somebody tell me the best way to implement the logic similar to SQL Composite Key Constraint.
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Where do you want to implement this?
---
b { font-weight: normal; }
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I have an array of objects of a class having 10 fields. The first 5 fields should behave like composite keys of a sql table. So only objects conforming to the constraint can be added.
I know that this can be achieved using DataSets and DataRelations. I dont want to use it.
I just need a simple logic to implement this in an ArrayList.
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Slow method:
Loop through all the records and compare the values in the fields to the new values you want to add.
Fast method:
Create a hash value for the fields and store in the object. Create a hash value for the new values and loop through the records and look for the hash value.
Even faster method:
Use a hash table instead of an array, create a composite value of the fields and use as key in the hash table. Create a composite value of the new values and check if it exists in the hash table.
---
b { font-weight: normal; }
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Hi community,
i cteate an application on win xp prof. with frameworks 1.0,1.1 and 2.0 Beta, and there r no errors on machines with framework 2.0, but only if i try to install them to an machine with framework 1.1 or 1.0 i got an error that i need framework version 2.0! How can i target an framework version that is installed on the current machine??? is this posible??? i use VS .Net 2005! i try to change the version in the setup->lauch conditons->version = 1.1.4322 but they dont work?!  when i change all references from 2.0 to 1.1 i recive an error like this:
"System.BadImageFormatException: The format of the file 'Installer.exe' is invalid"
Any suggestions for me?
Thanx for help!
mirso
-- modified at 8:24 Wednesday 7th September, 2005
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I have a textbox that needs to accept the format: 00:00:00
I would like for the format to be "Locked." Therefore, forcing the user to keep the values in this format. For example, when the textbox shows up, it automatically displays 00:00:00. And the user MUST put values in each place or leave them "0." I took a look at the DateTime method. However, it doesn't seem to do what I am looking for. Also, all values entered can only be 0 - 9. Thanks in advance.
D
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What you are looking for is a "masked edit control". Searching here at CodeProject or on Google will list many of them!
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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I can aso use rgular esxpressions whit the System.Text.RegularExpressions.RegEx.Ismatch method.
Here is one string pattern to use: "^(20|21|22|23|[01]\d|\d)(([:.][0-5]\d){1,2})$"
You can see more at: http://www.regexlib.com/DisplayPatterns.aspx[^]
Happy coding! 
La realidad no es más que impulsos eléctricos del cerebro - Morpheus
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Hello,
Is there a way to create a working installer for a snapin? I've created a snapin but I can't create a working installer  Has one of you guys ever delt with this problem? Is there a solution?
10x guys
Larry
--
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Hello,
I have a question regarding the inheritance of a sealed class. I would really want to know if it is possible inherit from FolderBrowserDialog. I want to extend the FolderBrowserDialog to do some checkings of the selected folder and to enable/disable the OK button. How can I do that in C#?
Larry
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Hai
Is there any way to find the line number & Source code that cause excpetion.
i mean in the code i need to get these things in seperate variables.
string linenumber = 'line number'
string expCode = ' code that leads to exception'
Thanks and Regards
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You can get this information from Exception.ToString()if you look to the end of the string you will see somthing like form1.cs:line 524 so to get line number you can write code in your exception handling code somthig like
catch(Exception ex)
{
string strExc=ex.ToString();
int pos=strExc.IndexOf(":line",0);
if(pos != -1)
{
MessageBox.Show(strExc.Substring(pos+5,strExc.Length-(pos+5)));
}
}
Note: in relase mode this inoformation will not generated to enable it in your project Build configration check Generate debugging information look at Printing Line Number with an exception in Release Mode[^] for more informaton
MCAD
-- modified at 13:04 Wednesday 7th September, 2005
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Hi All,
I was just wondering how to invoke a process under different security context with the specified credentials over network only, I used P/Invoke to call CreatProcessWithLogonW but since I had to use it with ASP.NET application p/Invoke was failing though It was working fine with Desktop application (Probably due to some security problems of IIS), I came to know that in .net2.0 things are pretty simple and I need to call only Static member Start of Process class by passing credentials but this is not invoking process instead I am getting error logon failure, I suppose this problem is becuase I don't know how to set logon flags which we could set in createprocesswithlogonw function..Can anyone tell me how to start a process using the specified credentials on the network only in .net2.0.
Regards,
Ruchir Dhar Dwivedi
Software Engineer
5th floor Marisoft, Cybage Software Pvt. Ltd., Kalyani Nagar, PUNE - 4 1 1 0 0 6, I N D I A
Phone(O) : 91-20-56041700,91-20-56044700 Extn 830 | AIM : RuchirAIM | cell : 09890939702
mail to : ruchird@cybage.com | www.cybage.com
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Sorry guy, im new in c#
Im using vs.net
Is there a way to update the input of a text box from a class that not in the main form1.cs? my additional class is suppose to update a status text box when a msg is sent.. any hint guys?
I suck at coding and only familar with C.. now trying out c#
string test=("listening:");
Form1.StatusText= test;//string.Copy("Listening..:");
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