Re: Memory and Collections - C# Discussion Boards

clear ComboBox content?

george ivanov14-Jun-05 3:51

george ivanov

14-Jun-05 3:51

How to clear ComboBox items?

thanks

Re: clear ComboBox content?

Roger Stewart14-Jun-05 3:55

Roger Stewart

14-Jun-05 3:55

The Items.Clear() method contained in your ComboBox instance.

Roger Stewart
"I Owe, I Owe, it's off to work I go..."

picturebox

Member 204148114-Jun-05 0:22

Member 2041481

14-Jun-05 0:22

I've made an interface in C# in which is it possible to load multiple images in pictureboxes. The problem is that the boxes are not transparent.
When the pictureboxes are overlapping, there is a white square around it.
Does anyone know how to solve this problem?

Greetz,

Sebastiaan

datagrid select row

xrado14-Jun-05 1:47

xrado

14-Jun-05 1:47

how do i select the whole row in datagrid when clicking on single cell without selecting text in it

Re: datagrid select row

Sendilkumar.M14-Jun-05 16:22

Sendilkumar.M

14-Jun-05 16:22

hey you want to do it in client side or server side.

If you want in client side,you can add the JaveScript function to each item of the DataGrid in Item created event.

For Server side use select button.

But client sied will be very easy and fast.

If you want code stuff for that ask me i will send it to you

Tnx

M.Sendilkumar
Thomson,Blore,India

Re: datagrid select row

xrado14-Jun-05 19:40

xrado

14-Jun-05 19:40

im interested about client side and im talking about visual selection
same happen if you click on row header (the whole row is selected without texi in single cell) and i wana same to happen when i click on any cell

if you have the code to solve this ..please

bye

Memory and Collections

horacyjr14-Jun-05 1:37

horacyjr

14-Jun-05 1:37

I need to keep informations in memory, so i am using System.Collections - ArrayList, my structure is a Father and Son and grandson, where each Father can have any Son and each Son can have any grandson .
Father and Son and grandson are Arraylist, is there any problem adding then in each other ?
this structure is a tree, is there another to do this ?

ArrayList father = new ArrayList();
ArrayList son = new ArrayList();
ArrayList grandson = new ArrayList();

grandson.Add("joão");
grandson.Add("MAx"):
grandson.Add("Junior"):

son.Add(grandson);

father.Add(son);

thanks

Re: Memory and Collections

Christian Graus14-Jun-05 1:58

Christian Graus

14-Jun-05 1:58

Why not a class for each, which carries an arraylist of it's children and one of it's parents ? Ideally, you could give each person an ID, and store the names in a single hashtable by ID, so you can look up names when you need them, but the classes just carry an array of numbers ( nice and efficient, each name is only stored once ).

Then you could have a single arraylist of person objects, each of which has it's own ID, and the ID's of it's relatives. Of course, I'm not sure how this would suit you in terms of your searching needs.

So

Person bob = new Person("Bob");
Person fred = new Person("Fred");
Person Bill = new Person("Bill");

Inside the person class:

ArrayList myChildren = new ArrayList();
static Hashtable Names = new Hashtable();
static int IDs = 0;

Inside the constructor:

this.ID = IDs++;
Person.Names[this.ID] = name;

Then a method to add a child:

public int AddChild(Person child)
{
myChildren.Add(child.ID);

return myChildren.Count;
}

You could either add grandchildren with a method, or implicitly ( have a GetGrandchildren method that works out who the children of my children are ).

Christian Graus - Microsoft MVP - C++

Re: Memory and Collections

horacyjr14-Jun-05 3:07

horacyjr

14-Jun-05 3:07

Hi Christian Graus thanks for helping

i would like to know one more thing, how does an ArrayList works ?it is like a linked node or it is like a common Array ?

Thanks

Re: Memory and Collections

leppie14-Jun-05 4:37

leppie

14-Jun-05 4:37

It uses an array in the background Smile | :)

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: Memory and Collections

Judah Gabriel Himango14-Jun-05 8:26

Judah Gabriel Himango

14-Jun-05 8:26

It uses an array in the background. If the number of items added are more than the number of items in the array, the array is copied, and reallocated to a larger array, usually 2x the size of the original.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

transfer files from server to client

pjay2314-Jun-05 1:34

pjay23

14-Jun-05 1:34

how do i transfer files / folders from one server to client without ftp

Re: transfer files from server to client

Christian Graus14-Jun-05 1:37

Christian Graus

14-Jun-05 1:37

Set the page heading to be of the required file type and stuff the file bytes into the request.

Christian Graus - Microsoft MVP - C++

delete unfected files

Member 182653314-Jun-05 1:24

Member 1826533

14-Jun-05 1:24

Hi,Sometimes when you want to clean an infected file from a virus you cannot do this ,so you must delete the infected file.....please I want to know when this happen so I must delete the file

Re: delete unfected files

Christian Graus14-Jun-05 1:31

Christian Graus

14-Jun-05 1:31

You're writing a virus checker in C#, or.... ???

Christian Graus - Microsoft MVP - C++

Re: delete unfected files

mav.northwind14-Jun-05 3:34

mav.northwind

14-Jun-05 3:34

Are you going to the same class as AristotleYu?
Lots of clueless people wanting to write a virus scanner in C#...
Sigh | :sigh:

mav

Desktop Icons

Sabry190514-Jun-05 0:51

Sabry1905

14-Jun-05 0:51

hi all
is there anyway in C# or using winAPI that can help me in arranging desktop icons on a small area in the middle of the desktop wallpaper or in more detail can i set the coordinates of each icon as i wish
thx all

query about retrieving data from varbinary types

G_Zola14-Jun-05 0:10

G_Zola

14-Jun-05 0:10

When using the "SQLServer" mode in web.config in ASP.NET, the session objects' values will be stored into an SQL server as varbinary data types....

What i am interested to know if there is a way to deserialize the varbinary data type back into the same session object as before......

Thanks

GDI+ flicker when drawing to a panel

JDUK13-Jun-05 20:18

JDUK

13-Jun-05 20:18

I have a panel inside a form im drawing to becuase the drawing space needs to be bigger than the form and the user needs to be able to scroll round the image using the form scroll bars..

i have used
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);

to try and stop the flicker but it only works when the form itself is drawn to.
How do i get double buffering to work on the panel?

Thanks.

Re: GDI+ flicker when drawing to a panel

JDUK13-Jun-05 20:59

JDUK

13-Jun-05 20:59

This problem has been plauging me for weeks.... then a minuite i post this i stubmle across the solution (more by luck than judgment) .. sods law, hey?
All sorted now thanks. Big Grin | :-D

Re: GDI+ flicker when drawing to a panel

Judah Gabriel Himango14-Jun-05 8:35

Judah Gabriel Himango

14-Jun-05 8:35

You care to post your solution? There are thousands of others with the same flicker problem.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

Re: GDI+ flicker when drawing to a panel

JDUK14-Jun-05 12:40

JDUK

14-Jun-05 12:40

Yeah sorry about that...
I hate it when I search for a problem and the OP says "sorted" and it just dies right then and there, to.

So here goes:

My Drawing function looked like this(Though it has been drasticly cut down to the bare minimum for readability):

<br />
private void DrawMyStuff()<br />
	{<br />
	 System.Drawing.Graphics myGraphics;<br />
	 myGraphics = myPanel.CreateGraphics();<br />
	<br />
	 MyGraphics.DrawImage(myBitmap, x*Size,y*Size);<br />
	 MyGraphics.Dispose();<br />
<br />
	}<br />

My panels paint method looked like this

<br />
private void myPanel_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
	{<br />
         DrawMyStuff();<br />
	}<br />

I have since changed it to look like this:

<br />
private void DrawMyStuff(Graphics g)<br />
	{<br />
	 g.DrawImage(myBitmap, x, y);<br />
	 g.Dispose();<br />
	}<br />

<br />
private void myPanel_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
	{<br />
         DrawMyStuff(e.Graphics);<br />
	}<br />

I think my problem was re-assigning the graphics object every time and in a way bybassing the double buffering by recreating the drawing surface constantly.

Hope that helps some people...

Property with another name in the Designer

Trambert13-Jun-05 22:47

Trambert

13-Jun-05 22:47

Hello!

I've got a problem in Visual Studio 2005. I must create a derived class from TablePanelLayout, and also override or hide the herited member called "Columns" in the Designer, to add more functionalities like a minimum size..

The problem is that there is no property called "Columns" in the TablePanelLayout. Only a property called "ColumnStyles" but there still have a property in the Visual Studio Designer called "Columns". And like the property "Rows", it's opening a property editor for the columns/rows styles...

I'm supposing that there is an attribute or something special to describe these two "fake properties" bat i can't find it. I want to erase them, i don't want to have two properties called "Columns" in the designer...

Thanks for your help.
And i am sorry for my bad English lol I hope i was clear enough.

Re: Property with another name in the Designer

MoustafaS14-Jun-05 0:35

MoustafaS

14-Jun-05 0:35

You can use -in your derived class-:

public override ICollection Columns = null;

Re: Property with another name in the Designer

Trambert15-Jun-05 2:08

Trambert

15-Jun-05 2:08

It's ok... The property name in the designer was just remplaced ba the attribute
[DisplayName("Column")]

the original property is named "ColumnStyles" and it just have another name in the designer.

Thanks for your help!

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