C# Discussion Boards - CodeProject

Re: Cannot read .xls file - microsoft jet database engine could not find the object error

27-Apr-09 11:51

Hi,

1.
if you reply to yourself, you get an e-mail notification and I don't.

2.
who would be so smart as to create text files with .xls extension?
those cannot be opened by database code at all.
assuming you have Excel installed, if double-clicking fails, so will your app.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

dariusUK28-Apr-09 10:59

dariusUK

28-Apr-09 10:59

Hi,

1. Ok, didn't know

2. As I've written in my first post these are files generated by SAP application. I'm trying to automate what I'm doing at my job by my application that's why I want to use those. Actually Excel recognizes these files and opens them normally, but when you trying to save the file then you are asked whether you want to save the file as Unicode text (but with .xls extension) and then you get a message that some features may not be supported. Such files can be opened in OpenOffice as well as I tried it.

Any advice?

Regards, Darius

setting height and width of controls in form

mist_psycho25-Apr-09 6:34

mist_psycho

25-Apr-09 6:34

I have a windows form. I set the "window state" property to "maximize". But in this form i have 2 controls: a picture box and a windows media player tool. They are placed side by side.

How can i set the height and width of the picture box tool and windows media player tool, so tat their size (width and height)is 1/2 the size of the form, after the form is maximized....

plz help------

Re: setting height and width of controls in form

fly90425-Apr-09 7:01

fly904

25-Apr-09 7:01

Ever thought of working for NASA? Because this is ground breaking stuff.

Here's a little hint:
this.pictureBox1.Width = this.ClientSize.Width / 2;

and

this.Resize += new EventHandler(ResizeForm);<br />
private void ResizeForm(object obj, EventArgs e)

My failometer is detecting vast quantities of FAIL!

Re: setting height and width of controls in form

Luc Pattyn25-Apr-09 7:07

How to make a program like Paint with C#

25-Apr-09 7:07

A second grade astronaut might consider a TableLayoutPanel, I haven't used it so far.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

MohammedMahmoud25-Apr-09 6:06

25-Apr-09 6:06

hi everyone iam a C# programmer iam not profrssional

i want to make a program like MS paint , i will use C#

i need this program

i tried to make but when i draw any thing on the picture box all what i drawed cleared when i move the form

please reply me

thanks
Mohammed Mahmoud

Luc Pattyn25-Apr-09 6:23

25-Apr-09 6:23

Hi,

A PictureBox is just good enough for displaying an image, no more, no less.
If you want to draw onto something, chose a Panel.

There are several CP articles about Paint apps; and there is paint.net[^]

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

MohammedMahmoud25-Apr-09 6:29

25-Apr-09 6:29

thanks mr Luc Pattyn

iam use a panel too, but again when i drawing any thing and move the form or when i minimize it the drawing is clear

please excuse me my english langauge is not good

thanks and i wish u reply me

Luc Pattyn25-Apr-09 6:33

25-Apr-09 6:33

Here is my standard advise on painting:

there are several steps to correctly draw something so it becomes visible on the screen:

1.
decide upon what object you want to draw; it normally is a Control (e.g. a Panel) or a
Form itself. I prefer to add a Panel to a Form, then draw on the Panel.

2.
create some variables (Rectangle, struct, class, whatever) that hold the parameters of
your drawing. For a rectangle that could be top and left coordinate, and width+height,
or just a Rectangle. etc.

3.
create a Paint handler (either add your own paint handler to the Paint event, or
override the OnPaint method) for that Panel, and do all your drawing in there,
using the Graphics class and your variables.

4.
when you want to change things, modify the variables and call Panel.Invalidate() or
one of its overloads (for selective invalidation).

5.
If you want to animate things, perform the move (step 4) inside the Tick handler
of a Windows.Forms.Timer

BTW: if you need to create some objects (Fonts, Pens, Brushes, ...) either keep them
alive in class members (hence create them only once); or create them inside the Paint
handler and don't forget to call Dispose() on them.

I trust the CP articles do it this way...

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

MohammedMahmoud25-Apr-09 6:48

25-Apr-09 6:48

thanks

but all what i need that when click on a button the program draw a ecllipse on the drawing area on a point that i will enter it on a text box

that is what i need

can you help me on it
thanks for your interested

MohammedMahmoud25-Apr-09 6:58

25-Apr-09 6:58

Luc Pattyn25-Apr-09 7:02

25-Apr-09 7:02

Here is my standard advise on painting, no matter what exactly you want to paint or draw:

there are several steps to correctly draw something so it becomes visible on the screen:

1.
decide upon what object you want to draw; it normally is a Control (e.g. a Panel) or a
Form itself. I prefer to add a Panel to a Form, then draw on the Panel.

2.
create some variables (Rectangle, struct, class, whatever) that hold the parameters of
your drawing. For a rectangle that could be top and left coordinate, and width+height,
or just a Rectangle. etc.

3.
create a Paint handler (either add your own paint handler to the Paint event, or
override the OnPaint method) for that Panel, and do all your drawing in there,
using the Graphics class and your variables.

4.
when you want to change things, modify the variables and call Panel.Invalidate() or
one of its overloads (for selective invalidation).

5.
If you want to animate things, perform the move (step 4) inside the Tick handler
of a Windows.Forms.Timer

BTW: if you need to create some objects (Fonts, Pens, Brushes, ...) either keep them
alive in class members (hence create them only once); or create them inside the Paint
handler and don't forget to call Dispose() on them.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

MohammedMahmoud25-Apr-09 8:04

25-Apr-09 8:04

ok mr Luc Pattyn
but iam try what u say but unuseful

please i want you to send me a code to draw a ecllipse in a panel or if u can send me a project of this

sorry iam tired u , but u r a very good person

thanks for ur advice

Luc Pattyn25-Apr-09 8:21

25-Apr-09 8:21

private int x = 0;
private int y = 0;
private int width = 200;
private int height = 100;
private Pen pen=Pens.Black;

public myForm() {
    InitializeComponents();
    Panel p=new Panel();
    Panel.Bounds=...;
    Controls.Add(p);
    p.Paint+=paintHandler;
    ...
}

private void paintHandler(object sender, PaintEventArgs e) {
    Graphics g=e.Graphics;
    g.DrawEllipse(pen, x, y, width, height);
}

That is all you are going to get.
Read some articles, or better yet buy and study a book on C#.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

MohammedMahmoud25-Apr-09 8:33

25-Apr-09 8:33

thanks mr Luc Pattyn

ur code is very good but please i want to click a button to do this

thanks

Luc Pattyn25-Apr-09 8:48

25-Apr-09 8:48

This button[^] does everything you want.

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

MohammedMahmoud25-Apr-09 8:54

25-Apr-09 8:54

ok but when i put the code in the button event handler the same thing hapened to me the drawings cleared

fly90425-Apr-09 9:15

fly904

25-Apr-09 9:15

It is clear that you do not have the skill or knowledge to attempt this simple task.

May I suggest doing something easier, start with the basics, such as a loop counting to 10?

My failometer is detecting vast quantities of FAIL!

Re: Properties error in C#

Christian Graus25-Apr-09 11:30

Christian Graus

25-Apr-09 11:30

This forum is full of people at least as lost as you, so don't be upset. But, you're really lost and out of your depth. It's obvious you didn't follow the example given to you, because the reason the drawings clear, is that you used the wrong method to generate a graphics object. If you draw in your paint event, the image will not clear, it can't. So, buy a book, start with the basics, and approach this task when you know enough C# to understand the help offered to you.

Christian Graus

Driven to the arms of OSX by Vista.

"I am new to programming world. I have been learning c# for about past four weeks. I am quite acquainted with the fundamentals of c#. Now I have to work on a project which converts given flat files to XML using the XML serialization method" - SK64 ( but the forums have stuff like this posted every day )

Properties error in C#

gopinathtamil25-Apr-09 5:39

gopinathtamil

25-Apr-09 5:39

i have tried using below coding for shopping cart functionality...but it shows below error...

Error:

CS0501: 'CartItem.Quantity.get' must declare a body because it is not marked abstract or extern

Coding

using System;

public class CartItem : IEquatable<cartitem> {
	#region Properties

    public int Quantity
    {
        get;
        set;
    }

	private int _productId;

	public int ProductId 
    {
		get 
        { 
            return _productId; 
        }
		set 
        {
			_productId = value;
		}
	}

	private Product _product = null;  

	public Product Prod 
    {
		get 
        {
			if (_product == null) 
            {
				_product = new Product(ProductId);
			}
			return _product;
		}
	}

	public string Description 
    {
		get 
        { 
            return Prod.Description; 
        }
	}

	public decimal UnitPrice 
    {
		get 
        { 
            return Prod.Price; 
        }
	}
    public string productname
    {
        get
        {
            return Prod.Productname;  
        }
    }

	public decimal TotalPrice 
    {
		get 
        { 
            return UnitPrice * Quantity; 
        }
	}

	#endregion

	public CartItem(int productId) 
    {
		this.ProductId = productId;
	}

	public bool Equals(CartItem item) 
    {
		return item.ProductId == this.ProductId;
	}
}

</cartitem>

Luc Pattyn25-Apr-09 5:48