C# Discussion Boards - CodeProject

Re: have a textbox go through every permutation

crash89313-Mar-07 13:21

13-Mar-07 13:21

you are correct sorry it slipped my mind when i was giving the example

a
b
c
aa
ab
ac
ba
bb
bc
ca
cb
cc
aaa
aab
aac
aba

and so on

If it were numbers it would just be X=x+1 but in strings i cant figure it out.

Re: have a textbox go through every permutation

CPallini15-Mar-07 11:41

CPallini

15-Mar-07 11:41

in fact, more difficult (at least to me) then I expected. But finally (with a bit use of recursion):

public static void Main(string[] args)
{
  perms("abc");
  Console.Read();
}
public static void perms(string s)
{
  for (int iDigits=1; iDigits<=s.Length;iDigits++)
  {
    recurse(s, "", iDigits, 0);
  }
}
public static void  recurse(string sOrig, string sCur, int iDigits, int iLevel)
{
  iLevel++;
  for (int i=0; i<sOrig.Length;i++)
  {
    string sNew =sCur+sOrig[i];
    if (iLevel == iDigits)
    {
      Console.WriteLine(sNew);
    }
    else
    {
      recurse(sOrig,sNew, iDigits, iLevel);
    }					
  }
  iLevel--;
}

Hope that helps.

P.S. I made a try with perms("abcde") and it runs (the correctness check is up to you...) Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: have a textbox go through every permutation

crash89315-Mar-07 16:49

crash893

15-Mar-07 16:49

Thanks so much for your help

im still strugling to grasp the code

I'm having trouble getting it to run

the "for (int i=0; i"

line is giving errors

usually it would be for (int I=0: i<10;i++) or something like that but I'm not sure exactly what its supposed to be

i will start playing with it in the hopes i can get it working but if you wouldn't mind letting me know what its supposed to be i would be interested to see if i got it right

and again thanks for your help

Sorry, was a misunderstanding between ME & HTML

CPallini15-Mar-07 23:20

CPallini

15-Mar-07 23:20

Last night was a bit late. The fixed line follows:

for (int i=0; i<sOrig.Length; i++)

Let me know if there are further troubles.

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: Sorry, was a misunderstanding between ME & HTML

crash89318-Mar-07 6:55

crash893

18-Mar-07 6:55

nope that workes perfectly

thanks for your help

DataViewGrid and dates

crzyank8-Mar-07 9:51

crzyank

8-Mar-07 9:51

Hi,

I have DataGridView in my application connecting to Oracle DB. Oracle table has a date as '03/12/2007' and same is returned to the front end via DataSet. However when this dataset is bound to the grid, the date displayed is '03/11/2007'!!! Similarly all the dates that have two (2) digit days (from 10 to 31) are reduced by a digit! e.g. instead of '03/30/2007' it shows '03/29/2007'. If I do not use any formatting for the .DefaultCellStyle property then the date displayed is '03/11/2007 11:00 PM'. Dates with single digit days i.e. '03/08/2007' stays the same though - with or without formatting. Please note that my SQL statement truncates the date to short date format - TRUNC(pay_date) - already.

Any help is really appreciated.

Thanks.

crzYank

Re: DataViewGrid and dates

Frank Kerrigan8-Mar-07 11:41

Frank Kerrigan

8-Mar-07 11:41

You could try and just use text straight from Oracle and use it as string. If you are using a strong typeing thi might not be possible.

Grady Booch: I told Google to their face...what you need is some serious adult supervision. (2007 Turing lecture)

http:\\www.frankkerrigan.com

Re: DataViewGrid and dates

crzyank9-Mar-07 2:10

crzyank

9-Mar-07 2:10

That should work. I'll try that.

Thanks!

crzYank

Re: DataViewGrid and dates

crzyank9-Mar-07 2:15

crzyank

9-Mar-07 2:15

and it worked...........

crzYank

Settings Regional And Language Settings Programaticaly

Aztekman8-Mar-07 9:16

Aztekman

8-Mar-07 9:16

I have a need to change the Regional And Language Settings/Locale through my C# Application. To further Complicate the matter, it will need to be done using Win CE 5.0 operating system. I have Visual Studio 2005.
Anyone have any suggestions?

Thanks

Re: Settings Regional And Language Settings Programaticaly

Frank Kerrigan8-Mar-07 11:49

Frank Kerrigan

8-Mar-07 11:49

Have a look at the "culture" setting via code

This is for compact framework 1 but should still good

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=718942&SiteID=1[^]

Grady Booch: I told Google to their face...what you need is some serious adult supervision. (2007 Turing lecture)

http:\\www.frankkerrigan.com

Re: Settings Regional And Language Settings Programaticaly

Aztekman9-Mar-07 3:56

Aztekman

9-Mar-07 3:56

Thanks for the response. I am doing this project with the Compact framework.
I am not sure how this will help me set the Control Panel -> Regional Settings for different Languages->Cultures using C#/C++.
I Would also be ok with finding a DLL that I could connect to, to use some method within that would help me set the regional values.

IP to hostname

marwan_siala8-Mar-07 8:00

marwan_siala

8-Mar-07 8:00

i have an IP and i want to change it to host name
how is that??

thanks allot

Re: IP to hostname

pbraun8-Mar-07 8:31

pbraun

8-Mar-07 8:31

In your help look up Dns.GetHostEntry().

Phil

Re: IP to hostname

marwan_siala8-Mar-07 22:58

marwan_siala

8-Mar-07 22:58

GetHostEntry Resolves a host name or IP address to an IPHostEntry instance.
but i have an IP as a string and i need to resolve it to host name as a string too.

thanks allot

Re: IP to hostname

\laddie8-Mar-07 23:28

\laddie

8-Mar-07 23:28

Dns.GetHostByAddress("127.0.0.1").HostName

Hope this help.

Neo

Re: IP to hostname

marwan_siala8-Mar-07 23:35

marwan_siala

8-Mar-07 23:35

thanks allot. it works

best regards.

Null reference exception

error14088-Mar-07 7:48

error1408

8-Mar-07 7:48

Hi,
when i run this code i get a null-reference exception at the last line of code. I don't know why this happens, because i first add the node and it IS there. I looked in the debugger.
Does someone know a solution?
<code>
foreach (DateTime d in daten)
{
if (treeView1.Nodes.Find(d.Month.ToString(), false) != null)
{
treeView1.Nodes.Add(new TreeNode(d.Month.ToString()));
}
treeView1.Nodes[d.Month.ToString()].Nodes.Add(new TreeNode(d.Date.ToShortDateString()));
}
</code>

Re: Null reference exception

Edmundisme8-Mar-07 8:32

Edmundisme

8-Mar-07 8:32

It will be easier to see what's going on if you break out that last line of code as follows:

TreeNode node = treeView1.Nodes[d.Month.ToString()];
TreeNode newNode = new TreeNode(d.Date.ToShortDateString());
node.Nodes.Add(newNode);

This will allow you to check state as you step though in debug mode. When you put so much into a single line, it can be much less obvious what is breaking.

Re: Null reference exception

Ennis Ray Lynch, Jr.8-Mar-07 8:56

Ennis Ray Lynch, Jr.

8-Mar-07 8:56

if d is null from daten then d.Month will fail;

Also, treeView1.Notes[someString] may return null as well but it is most likely the d;

File Not Found

Re: Null reference exception

Guffa8-Mar-07 11:37

Guffa

8-Mar-07 11:37

Ennis Ray Lynch, Jr. wrote:
but it is most likely the d

Not so very likely... The variable d is a DateTime structure, and can't be null.

---
single minded; short sighted; long gone;

Actually

Ennis Ray Lynch, Jr.8-Mar-07 12:56

Ennis Ray Lynch, Jr.

8-Mar-07 12:56

Since daten is not defined in could very well be a non-generic 1.1 .NET collection such as an array list which are collections of objects. Iterating on such a structure would attempt to assign null giving the null reference exception. Below is written in 2.0 but uses the 1.1 collection ArrayList.

<br />
ArrayList list = new ArrayList();<br />
list.Add(DateTime.Now);<br />
list.Add(null);<br />
foreach(DateTime d in list) {<br />
    MessageBox.Show(d.ToShortDateString());<br />
}<br />

File Not Found

Re: Actually not

Guffa9-Mar-07 3:51

Guffa

9-Mar-07 3:51

No, it couldn't. If the daten collection would contain something other than DateTime values, the error would appear when the value is put in the d variable, not when the d variable is later used.

---
single minded; short sighted; long gone;

Re: Actually not

Ennis Ray Lynch, Jr.9-Mar-07 5:15

Ennis Ray Lynch, Jr.

9-Mar-07 5:15

Perhaps but when a question is posed so vague as to say where is my null reference exception i think any little bit of help will help.

Now you are correct in that when I said d.Month I was wrong. Sometimes I say the stupidest things. Of course, that could also fall into the category of someone designing an OO language that doesn't fully support nulls until the third release.

File Not Found

ListView

shamsteady8-Mar-07 7:41

shamsteady

8-Mar-07 7:41

Can anyone tell me how to use this control? Help me please...

public ListViewItem ( string[] items , System.Int32 imageIndex , System.Drawing.Color foreColor , System.Drawing.Color backColor , System.Drawing.Font font )

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.