C# Discussion Boards - CodeProject

Dave Kreskowiak2-Dec-04 1:34

2-Dec-04 1:34

You don't. This normally means that there is a problem with either your code or your Access installation, MDAC, VB installation, ... Check out this search result[^] on MSDN.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Rounding off decimals

Anonymous1-Dec-04 11:45

Anonymous

1-Dec-04 11:45

The problem is that I am sourcing various numbers from a machine. The numbers are like 1.00006587 and 0.000248. The problem is that I need to round off the last decimal so for example if 1.00006587 is given the result would be 1.00007
Help please! OMG | :OMG:

Re: Rounding off decimals

Christian Graus1-Dec-04 12:37

Christian Graus

1-Dec-04 12:37

Math.Round allows you to specify how many decimals to round to.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Re: Rounding off decimals

User 103263711-Dec-04 12:55

User 10326371

1-Dec-04 12:55

That's correct.

But Math.Round uses the bankers algorithm for rounding. So 3.45 returns 3.4 instead of 3.5.

Be wary of that. If you need to have normal rounding (I mean the one we learn in school) then you'll need to implement your own custom rounding procedure. Which is fairly easy.

Furthermore it's wise that you choose for the Decimal type instead of Single or Double type because these types are approximations and would give rounding errors quite quickly.

Kind regards

Marcel van den Hof

shadows please help

aquahawk1-Dec-04 10:53

aquahawk

1-Dec-04 10:53

how do i add shadows to the toolstrip menu
or a button or anything,is there any examples
any where i can look at , im using C# express

please help i have no clue and cant find anything on the subject.

Html Editor and Mail Program

Dirso1-Dec-04 10:15

Dirso

1-Dec-04 10:15

Hi,
I'm building a very simple mail program, the only required feature is to send mail in html format. That's what i need:
1) A component like a RichTextBox that allows me to edit html files/code in a WYSIWYG way
2) Is there any component that can send a html email with pictures?

Thank u very much,
Dirso

Re: Html Editor and Mail Program

cobyjone1-Dec-04 14:01

cobyjone

1-Dec-04 14:01

HTMLEditor is a pretty good - http://www.itwriting.com/htmleditor/index.php[^]

OpenSMTP.Net is a good smtp library - http://sourceforge.net/projects/opensmtp-net/[^]

Re: Html Editor and Mail Program

Dirso6-Dec-04 23:35

Dirso

6-Dec-04 23:35

Both has everything i need

Thank u very much,
Dirso

caret position in a being edited Node

TyronX1-Dec-04 10:03

TyronX

1-Dec-04 10:03

How do I set the Position of the caret of a Node in a Treeview that's being edited? There isn't a Select() function available like it is with textboxes

Re: caret position in a being edited Node

Dave Kreskowiak1-Dec-04 10:55

Dave Kreskowiak

1-Dec-04 10:55

There is nothing in the .NET BCL that will do this. There is no method to call anywhere in the TreeView or TreeViewNode, it's just not supported. I don't even know if the underlying TreeView control that the TreeView class wraps supports it.

You might be able to "fudge it" by getting the handle to the control that holds the text being edited and using the Win32 API SendMessage function call to send it the appropriate messages to position the caret. Don't ask me for details, I can't give them to you. This is all just a theory...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: caret position in a being edited Node

TyronX1-Dec-04 11:03

TyronX

1-Dec-04 11:03

ok, it isn't that necassary.
Thanks anyway.

Re: caret position in a being edited Node

TyronX2-Dec-04 7:54

TyronX

2-Dec-04 7:54

Darn. It seems that the Node Text can't be changed even after that text has been edited. At least it doesn't work when I do this in the AfterLabelEdit-Event because the new Node text gets assigned after this even or something like that

WindowsPrincipal in non-AD environment

Mike Hodnick1-Dec-04 8:21

Mike Hodnick

1-Dec-04 8:21

Does WindowsPrincipal or WindowsIdentity behave differently depending on whether the code is running in an Active Directory environment or a non-Active Directory environment? e.g. is a WindowsPrincipal always a WindowsPrincipal in any Windows environment?

Michael Hodnick
www.kindohm.com

how to rewrite xml file

IvyLee1-Dec-04 8:15

IvyLee

1-Dec-04 8:15

I have a window application. I save the form setting to a xml file. everytime if i changed form setting i need to modify the node and save it back to the xml file. all the examples i seen are add node to xml. but what i needed is to change inner text of that node not add one more node append to the end of xml.
How can i do to get what i want?

Tahnks for any suggestion

Re: how to rewrite xml file

Christian Graus1-Dec-04 9:49

Christian Graus

1-Dec-04 9:49

Use SelectSingleNode with an XPath to find the node, then set it's value.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Dynamically naming tabs

thepersonof1-Dec-04 7:49

thepersonof

1-Dec-04 7:49

Hi I'm trying to add tabs so that each one has a name like this:
tabPage 1
tabPage 2
etc

but if many tabs are opened and closed I don't want the number to go high.

This is what I've got so far:

int i = 0;
string index = "tabPage" + Convert.ToString(i);
if (mainTabs.TabPages.Contains(mainTabs.TabPages[index]))
{
string index2 = "tabPage" + Convert.ToString(i + 1);
mainTabs.TabPages.Add(index2);
}

Thanks for your help

Re: Dynamically naming tabs

RB@Emphasys1-Dec-04 9:23

RB@Emphasys

1-Dec-04 9:23

So i take it you're adding and removing tabs from the tab control, and you want to reuse numbers that have been removed up until the point of adding a new one? Is this correct? If so, couldn't you do something really simple, like create a collection (I.E. arraylist or something a little less intensive), and add numbers to it as they become available. Then remove them when you reuse them. So, you would just have a removetabpage function that would store the number of the tabpage you're removing, say 55, in an arraylist. When you created a new page, you could simply get the first number in the "discarded number" arraylist, assuming there is one, and remove it from the "discarded number" list. I'm sure someone else will have some answer thats a little more efficient, but I think this would work as a simple solution.

creating a list view like windows explorer view

iffi9921-Dec-04 7:15

iffi992

1-Dec-04 7:15

Hi All,
I need to know how can I make a list contorl like of windows explorer. From windows explorer view I mean when we open My Computer a list view is shown and the headers are shown as follows

Files stored on This computer
-----------------------------
(shared documents) (dotnetdocuments)

Hard Disk drives
------------------------------
(C),(D),..........

how can I bring this (Files stored on This computer) or
(Hard disk drives) like title in my List view

regards

Regex / String formatting question

julian_l1-Dec-04 7:05

julian_l

1-Dec-04 7:05

Hi All,

Question regarding splitting a string:

Let's say I have the following format:

[a-zA-Z]*-[0-9][0-9][0-9]-[A-Z][A-Z][0-9][0-9][A-Z]

or in short form, the split would be:
<s1>-<s2>-<s3><s4><s5>

E.g,
ABC-2-725-XY15A
s1 = ABC-2
s2 = 725
s3 = XY
s4 = 15
s5 = A

Note about s1,
it starts with an alpha character and is followed by any string...
there can be dashes and numbers, but there will never be "-[0-9][0-9][0-9]-" sequence in s1 so you'd know where s2 begins

Does anyone have an idea on how to split in such manner?

Thanks,
-Julian

Re: Regex / String formatting question

Anonymous1-Dec-04 10:10

Anonymous

1-Dec-04 10:10

Expresso - A Tool for Building and Testing Regular Expressions, By Jim Hollenhorst[^]

Re: Regex / String formatting question

julian_l2-Dec-04 6:17

julian_l

2-Dec-04 6:17

Thanks,

There's another one I was using,
http://www.regular-expressions.info/dotnet.html[^]

I kept trying to get Regex.Split to work for me when I simply needed go through the matched expressions using Match as Bitwise suggested.

Re: Regex / String formatting question

Bitwise Gamgee1-Dec-04 11:53

Bitwise Gamgee

1-Dec-04 11:53

string s = @"ABC-2-725-XY15A";<br />
Match m = Regex.Match(s, @"(.+?)-(\d\d\d)-(\w\w)(\d\d)(\w)");<br />
if (m.Success) <br />
    for (int i = 1; i <= 5; i++)    <br />
        Console.WriteLine("s{0} = {1}", i, m.Groups[i].Value);

- Bitwise

Re: Regex / String formatting question

julian_l2-Dec-04 5:57

julian_l

2-Dec-04 5:57

Thanks,

I didn't realize one could traverse the matched expression. I tried to do it with Regex.Split.

-Julian

foreign key

Mauricio Ritter1-Dec-04 4:20

Mauricio Ritter

1-Dec-04 4:20

When I use the Fill method of a DataAdapter it creates the table structure in my dataset. It also brings the PrimaryKey information about that table to the dataset. My question is: is there anyway to bring the "foreign key" information about the table columns ? How can I know which columns are foreign keys and to which table they refer ?

thanks

Mauricio Ritter - Brazil
MSN: mauricioritter(atsign)hotmail.com

English is not my native language so, if you find any spelling erros in my posts, please let me know.

Re: foreign key

Heath Stewart1-Dec-04 13:30

Heath Stewart

1-Dec-04 13:30

See the DataRelation class in the .NET BCL. It's pretty straight-forward and easy to make a typed DataSet by right-clicking on your project (or a folder under your project, which helps set the default namespace for your source files you add to them) and adding a new type, then choose DataSet. You can even drag and drop tables, views, and stored procedures from the server explorer to create elements (the DataSet designer is, after all, just the XML schema designer) that represent tables, while their elements represent fields. You can create primary keys and draw relationships. When you save this, it serializes using the CodeDomSerializer so that you have source code.

When you use it, instead of using DataSet ds = new DataSet();, for example, you would use MyDataSet ds = new MyDataSet();. That already has typed table and fiend names, as well as relationships established. Note, however, that the DataAdapter derivatives - or rather the command builders like SqlCommandBuilder - don't support auto-generation of complex statements required for updating a data source with changes.

All this is programmatic changes you can do manually, as well. It's most important to read the documentation, but you might also makes a typed DataSet in this manner and examine the source code (click "Project->Show Hidden Files" in the menu to see the source file itself).

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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