Re: listbox: delete multiple selection - C# Discussion Boards

Moh'd Bahrani15-May-05 10:39

15-May-05 10:39

Hi,

How can I implement a selection tool that is used to select a part of an image like the one in paint, photoshop or any..

I want the simplest way..;P

Regads..

Re: Selection Tool

Marc Clifton15-May-05 14:08

Marc Clifton

15-May-05 14:08

There's a few CP articles you can look at. Search google with:

rubberband C# site:codeproject.com

and you'll find more.

Here's one.[^]

A more complicated one.[^]

The second one, while not on the topic you are asking about, includes: "drawing rectangles with a rubberbanding like effect in Paintbrush" and perusing the code should get you on the right track.

Marc

MyXaml
Advanced Unit Testing
YAPO

Re: Selection Tool

Moh'd Bahrani16-May-05 5:15

Moh'd Bahrani

16-May-05 5:15

Thank you very much. I will try those...

Thank you again Smile | :)

Does anyone know a C# payroll program?

diabolusgorgon15-May-05 10:11

diabolusgorgon

15-May-05 10:11

I'm looking for a C# program that prompts the user for an hourly rate and the number of hours worked. It should compute the gross pay rate, withholding tax and net pay. The withholding tax is computed as a percentage of gross pay based on:

Gross Pay <or= 300="" is="" 10%="" withholding
gross="" pay=""> 300 is 12% withholding

Please can any one let me know if they have a C# program for this

Re: Does anyone know a C# payroll program?

Marc Clifton15-May-05 14:02

Marc Clifton

15-May-05 14:02

diabolusgorgon wrote:
Please can any one let me know if they have a C# program for this

This is a 5 minute exercise using the Visual Studio designer. But I guess it must quite the stumper of a homework problem, eh?

Marc

MyXaml
Advanced Unit Testing
YAPO

Re: Does anyone know a C# payroll program?

exhaulted16-May-05 4:29

exhaulted

16-May-05 4:29

Lol

Kev

listbox: delete multiple selection

bouli15-May-05 9:38

bouli

15-May-05 9:38

Hello gurus,

I'd like to know how I can delete multiple selected items from a listbox?

Thanks.

Best regards.

There is no spoon.

Re: listbox: delete multiple selection

Marc Clifton15-May-05 13:59

Marc Clifton

15-May-05 13:59

bouli wrote:
Hello gurus,

Hey there.

bouli wrote:
I'd like to know how I can delete multiple selected items from a listbox?

One at a time?

Of course, the guru part of me insists on providing a more complete answer. Delete from the last index to the first, so the indexes of the items don't have to be recalcuated when you delete items from the list. Poke tongue | ;-P

Marc

MyXaml
Advanced Unit Testing
YAPO

Re: listbox: delete multiple selection

Gary Perkin16-May-05 2:33

Gary Perkin

16-May-05 2:33

Hi Bouli,

This should do it...

void Button1Click(object sender, System.EventArgs e)
{
    for (int i=0; i < listBox1.Items.Count; i++)
    {
        if (listBox1.SelectedIndices.Contains(i))
        {
            listBox1.Items.RemoveAt(i);
            i--;                    
        }
    }    
}

Hope it helps,
Gary Perkin.

PS On reflection, Marc Clifton's suggestion to count backwards is probably neater than my i-- D'Oh! | :doh:

Re: listbox: delete multiple selection

bouli16-May-05 4:38

bouli

16-May-05 4:38

it works just fine Smile | :)

Thanks!!!

There is no spoon.

Auto Update on Control

RockmanHero200315-May-05 9:21

RockmanHero2003

15-May-05 9:21

Hi,

I was wondering if it is possible to have a control that is automatically updated when the user changes a directory that that control represents. This is similar to a folder browser dialog but instead it's inside a form rather than a separate control.

Thanks

RockmanHero2003

My computer finally got faster...I threw it out the window and it went very fast.

Re: Auto Update on Control

John Arlen116-May-05 15:29

John Arlen1

16-May-05 15:29

Look at System.IO.FileSystemWatcher.

This class exposes events that will let you know when certain file system changes have happened. This is exactly what Folder Browser Dialog uses (under the covers).

Re: Auto Update on Control

Gary Perkin16-May-05 23:56

Gary Perkin

16-May-05 23:56

Hi RH2K3

This sounds interesting, but I think your spec needs a bit of work;)

Can you expand on "a control that is automatically updated" and "inside a form rather than a separate control" ?

Gary Perkin.

Using C# to make a DOS app?

Anthony Mushrow15-May-05 8:14

Anthony Mushrow

15-May-05 8:14

I heard off somebody here that i could use C# to make DOS apps (Though it would be limited)

And i was wondering, what compiler compiles C# into a 16-bit DOS app. instead of a standard windows app?

Re: Using C# to make a DOS app?

DavidNohejl15-May-05 8:25

DavidNohejl

15-May-05 8:25

err don't you mean "Console" type project?

The Undefeated wrote:
And i was wondering, what compiler compiles C# into a 16-bit DOS app. instead of a standard windows app?

No compiler I know about do that. All compile C# to IL.

David

Never forget: "Stay kul and happy" (I.A.)

David's thoughts / dnhsoftware.org / MyHTMLTidy

Re: Using C# to make a DOS app?

Anthony Mushrow15-May-05 8:36

Anthony Mushrow

15-May-05 8:36

Err. No i know how to make console app. but i wanted something that would run in DOS, console app dont work in DOS (they need to be compiled for use with DOS using something like Turbo C++ - but of course thats for C++)

Re: Using C# to make a DOS app?

DavidNohejl15-May-05 8:46

DavidNohejl

15-May-05 8:46

It's easy then. You must have .NET Framework for C# apps. IMO .NET Framework is for Win2k and newer, definitely not for DOS. There is way how to pre-compile app to machine code, but that's for faster startup only (I think) - NGen[^]

David

Never forget: "Stay kul and happy" (I.A.)

David's thoughts / dnhsoftware.org / MyHTMLTidy

Re: Using C# to make a DOS app?

Luis Alonso Ramos15-May-05 10:18

Luis Alonso Ramos

15-May-05 10:18

dnh wrote:
IMO .NET Framework is for Win2k and newer

Actually the .NET Framework works with everything since Windows 98 (just not 95), but still, not in old regular MS-DOS.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

Re: Using C# to make a DOS app?

DavidNohejl15-May-05 10:46

DavidNohejl

15-May-05 10:46

Thanks.

David

Never forget: "Stay kul and happy" (I.A.)

David's thoughts / dnhsoftware.org / MyHTMLTidy

Re: Using C# to make a DOS app?

Peter Vertes15-May-05 16:31

Peter Vertes

15-May-05 16:31

I'm afraid you are out of luck Undefeated. .NET requires the underlying OS to able to be 32-bit capable. DOS on the other hand is only 16-bit capable hence .NET will not be able to run on it. Sorry...

Re: Using C# to make a DOS app?

CiNN23-May-05 7:29

CiNN

23-May-05 7:29

someone could have written its own ompiler ^o^
that compile C# CLR for DOS with customized functions

C# - Insert data into Paradox table without primary key.

elapid15-May-05 8:13

elapid

15-May-05 8:13

Dear,

Thank you for reading this question, please help me out if you can.

I got a paradox table without primary key, now I am trying to insert data into it, but keep getting an error: "Operation must use updateable query". Now after doing some readings, I found that it is because the table doesnt have a primary key, and the suggestion was to create a primary key for the datatable...

Now how do i do that? I also try to use the InsertCommand, but doesn't know how it works.. if someone could please explain this to me.. like how it works, and when it get triggered..etc

thank you.
Elapid
elapidd@yahoo.com

Elapid needs help.

Re: C# - Insert data into Paradox table without primary key.

Marc Clifton15-May-05 9:08

Marc Clifton

15-May-05 9:08

elapid wrote:
Now how do i do that?

The DataTable class has a PrimaryKey property which takes a DataColumn array, where each data column in the array is a column of the data table that is the primary key.

So, you would do something like:

dt.PrimaryKey=new DataColumn[] {dt.Columns["ID"]};

Of course, the real question is, why doesn't your table in the database have a primary key? If you load the data set with schema information, the data table should already be configured with the primary key, I think.

Marc

MyXaml
Advanced Unit Testing
YAPO

Re: C# - Insert data into Paradox table without primary key.

elapid15-May-05 10:34

elapid

15-May-05 10:34

Marc,

I understood the primary key part, but in paradox table, i dont really know how to make a [name].DB (paradox table) with a primary key.

mysql command is : create table Test.DB (Code varchar(2) primary key, Desc varchar(30))
and it keeps bombing on me saying index 345-3-543-5-34 is not valid

any suggestion?

Elapid For The Win

Re: C# - Insert data into Paradox table without primary key.

Marc Clifton15-May-05 14:25

Marc Clifton

15-May-05 14:25

elapid wrote:
i dont really know how to make a [name].DB (paradox table) with a primary key.

Maybe this will help:

http://media.datadirect.com/download/docs/odbc/odbcref/paradox.html[^]

It seems that the syntax is something like:

CREATE UNIQUE INDEX PRIMARY ON test (Code)

Unsure | :~

Marc

MyXaml
Advanced Unit Testing
YAPO

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