Re: Where do i find an Object Int type - C# Discussion Boards

misterbear17-Jul-03 9:54

17-Jul-03 9:54

Does anyone know how to locate a specific node in a treeview control? I have the full path (string) to the element, but now i want to select the given node in the treeview.

Is there any easy way to do this?

i.e i have the string "folderlevel1\folderlevel2\child1", and i want to select the node with name "child1" in the structure...

i'd really appreciate some help.

Re: locating a node in a treeview control?

Nick Parker17-Jul-03 10:13

Nick Parker

17-Jul-03 10:13

Use a foreach loop to loop through the Node's within the treeview.

-Nick Parker

Can you have a space in Table Name & query it from C#

Khang Nguyen17-Jul-03 8:32

Khang Nguyen

17-Jul-03 8:32

Hello Gurus,

I inherited a MS Access database. One of the columns in a table happened to name with a SPACE in the middle, "FrameMaker Location". I know, it's not a smart way to name a column.

I was trying to insert some new records into the table. It only worked when I removed the SPACE from the column name (from my code and DB), like "FrameMakerLocation". Otherwise, I got an error like this "Syntax error in INSERT INTO statement".

Do you know any tricks so that I don't have to rename the column name???

Thanks so much in advance
Have a great Thur.
Khang Nguyen;)

Here is my draft of code (roughly)

===================================================================

DataRow row = dataSet.Tables[0].NewRow();

row["FrameMaker Location"] = sFrameMakerLoc;

dataSet.Tables[0].Rows.Add(row);

iNumOfAffectedRecs = adapter.Update(dataSet);

Re: Can you have a space in Table Name & query it from C#

Ray Cassick17-Jul-03 8:53

Ray Cassick

17-Jul-03 8:53

I am not sure but try enclosing the name in square brackets [ ].

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.

Re: Can you have a space in Table Name & query it from C#

Khang Nguyen17-Jul-03 9:53

Khang Nguyen

17-Jul-03 9:53

Ray, I tried it but it did not work. Thanks for the suggestion.
Khang;)

Re: Can you have a space in Table Name & query it from C#

Uwe Keim17-Jul-03 23:47

Uwe Keim

17-Jul-03 23:47

It depends on the underlying database which characters can be used to quote special characters. For SQL Server and MS Access, '[' and ']' work.

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Where do i find an Object Int type

Anonymous17-Jul-03 7:34

Anonymous

17-Jul-03 7:34

I want to be ables to set int's to null but I can set Int32 to null

Re: Where do i find an Object Int type

leppie17-Jul-03 8:17

leppie

17-Jul-03 8:17

No you cant! A valuetype cannot be null, but a boxed valuetype can. This means you will have to cast the int to object ie:

object myint = (object) 5;

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Saving Images

Johan Lombaard17-Jul-03 7:07

Johan Lombaard

17-Jul-03 7:07

I am trying to write a class to draw an image and then save it to a JPEG.
The drawing is easy, but the saving part is a female dog.
Can anyone help me with ideas on how to do this ?

Johan Lombaard

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former - Albert Einstein

Re: Saving Images

leppie17-Jul-03 8:13

leppie

17-Jul-03 8:13

Bitmap.Save()?

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

place a file into clipboard

tomc17-Jul-03 7:07

tomc

17-Jul-03 7:07

I try to place a file into the clipboard so I can later paste them in Explorer. I can place text, bitmap etc using Clipboard.SetData, but how can I place a file into the clipboard?

Thanks

Re: place a file into clipboard

leppie17-Jul-03 8:19

leppie

17-Jul-03 8:19

You dont. Use a filename to reference the file.

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: place a file into clipboard

tomc17-Jul-03 9:13

tomc

17-Jul-03 9:13

can you give more detail? I want to do the following.

If I click a button, a file (its name) is place on clipboard, then go to Explorer and hit CtrlV

thanks

ListView Header Icons for Sorts

jzal817-Jul-03 6:12

jzal8

17-Jul-03 6:12

How can I make it so that the vertical pointing icons appear in my ListView after the user has clicked on a header to sort it????? I have been trying to figure this out for a bit now and I dont have a clue.

DataSet

totig17-Jul-03 5:57

totig

17-Jul-03 5:57

Hi. I created a dataAdapter and a typed dataset, which refers to a stored procedure that takes an input value. How would I use this dataSet, or fill the dataAdapter, as I dont know how to tell it what the input value must be (which happens to be an int).

Check prev program

Pham Minh Ngoc17-Jul-03 3:01

Pham Minh Ngoc

17-Jul-03 3:01

I am writing a function that checks whether the same program already started. In case the same program is lready started, the control will be moved to the opened program, and the program is closed. Sleepy | :zzz:

PMN

Re: Check prev program

Anthony_Yio18-Jul-03 2:23

Anthony_Yio

18-Jul-03 2:23

Try this
http://www.codeproject.com/csharp/cssingprocess.asp

You want that your program/process only appear once right? this should help.
Wink | ;)

"dataGrid",No one can Help??

Anonymous17-Jul-03 0:31

Anonymous

17-Jul-03 0:31

i created a table with 9 columns using datatable and tablestyles.
Also i got a DataRelation.
How can i tell my childcolumn to change if the parentcolumn changes?
e.g. in column "number" is 10 the value,
if I change the value to 17 in parenttable,the value in childttable should also change

Hashtable question

Venkatraman17-Jul-03 0:06

Venkatraman

17-Jul-03 0:06

Hey i am using a hashtable, and i am adding my fields collection to it.
when i iterate through them they found to be not in the order in which i added them. how do i maintain the sequence in which the elements are added.

thanks

Cheers,
Venkatraman Kalyanam
Bangalore - India

"Being Excellent is not a skill, it is an attitude"

Reality is an illusion caused by caffeine deficiency(one Microsoft Research scholor)

Re: Hashtable question

Arjan Einbu17-Jul-03 1:16

Arjan Einbu

17-Jul-03 1:16

You don't. Hashtables do not store the sequence that you added the items.
You should use an arraylist.

Re: Hashtable question

Frank Olorin Rizzi17-Jul-03 6:13

Frank Olorin Rizzi

17-Jul-03 6:13

Indeed.
If you want your data to be always sorted, ArrayList is probably better than Hashtable.
If you use Hashtable because most of the times you don't care about sorted data, but
you'd rather have a near-O(1) access time, then Hashtable is better.

Note, however, that you can use an Hashtable and, when needed, sort the values as needed and live happily ever-after.

Frank

Re: Hashtable question

Jim Stewart17-Jul-03 6:14

Jim Stewart

17-Jul-03 6:14

You might consider the System.Collections.Specialized.ListDictionary. It implements the IDictionary interface with a linked list. It would be my guess (just a guess) that the order of addition is maintained. Be aware, according to the documentation, ListDictionary is superior to hashtable performance-wise up to about ten items. If your list is longer, consider another strategy.

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

Re: Hashtable question

Arun Bhalla22-Jul-03 16:16

Arun Bhalla

22-Jul-03 16:16

For me, the best solution tends to be maintaining two data structures, an array or arraylist with the keys in the desired order, and a hashtable with the key-value pairs.

You could easily devise data structures that combine the two, such as a hashtable where the list of keys is a linked list.

Assigning text or name of button to variable

eggie516-Jul-03 23:38

eggie5

16-Jul-03 23:38

I have a set of 8 buttons, named "button0, 1, 2,... 7" their text also coresponds with their names, such as "0, 1, 2,... 7".

for each button I have this code..

private void button1_Click(object sender, System.EventArgs e)
{
    int nOutNum;
    string NUM="1";
    nOutNum=short.Parse(NUM, NumberStyles.AllowHexSpecifier);
    NTPort.Outport(nAddress, (short)nOutNum);


}

for each button I have string NUM equal what ever the text of the button is, 0-7.

That's kinda' ghetto looking and to manage...

here's the question...

how can I make NUM equal whatever the text of the button says...?

/\ |_ E X E GG

Re: Assigning text or name of button to variable

fool17-Jul-03 0:39

fool

17-Jul-03 0:39

Hi eggie5,

1. set each button's Tag property to the appropriate number
2. create only one callback method for all button's click event and assign it
3. use the sender object to get the Tag property's value

// step 1 - alternatively do this within the designer
// private void InitializeComponent()
// {
	// ...
	this.button1.Tag = 1;
	this.button2.Tag = 2;
	this.button3.Tag = 3;
	this.button4.Tag = 4;
	this.button5.Tag = 5;
	this.button6.Tag = 6;
	this.button7.Tag = 7;
	// ...
// }

// step 2 - alternatively do this within the designer
// private void InitializeComponent()
// {
	// ...
	this.button0.Click += new System.EventHandler(ClickHandler);
	this.button1.Click += new System.EventHandler(ClickHandler);
	this.button2.Click += new System.EventHandler(ClickHandler);
	this.button3.Click += new System.EventHandler(ClickHandler);
	this.button4.Click += new System.EventHandler(ClickHandler);
	this.button5.Click += new System.EventHandler(ClickHandler);
	this.button6.Click += new System.EventHandler(ClickHandler);
	this.button7.Click += new System.EventHandler(ClickHandler);
	// ...
// }

private void ClickHandler(object sender, EventArgs ea)
{
	// step 3
	short nOutNum = (short) ((Control)sender).Tag;
	NTPort.Outport(nAddress, (short)nOutNum);	
}

Have fun,
Dave

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