C# Discussion Boards - CodeProject

Re: Control cannot fall through from one case label ('case 64:') to another?

15-Mar-09 20:33

Well, if you're determined to write bad code, why are you posting about it here ?

Christian Graus

Driven to the arms of OSX by Vista.

Megidolaon16-Mar-09 1:49

Megidolaon

16-Mar-09 1:49

Actually break; cause the switch to exit and continue with the codoe afterwards.
Leaving it and not writing anything, but simply adding other case will automatically cause the switch to move on and execute all code until the next break;

Thus if you have somethng like this:

switch(number)
   case 1: //do stuff
     break;

   case 2:  //do stuff or not
   case 3: // do more stuff
      break;
   
   case 4: //do stuff
      break;

the program will do the exact same for 2 and 3.
If you don't want it to do anything different for 2, you might as well leave that case empty, so it immediately goes to the next code before the break;

Make Transparent....???

S K Y15-Mar-09 16:44

S K Y

15-Mar-09 16:44

i tried this......

this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(64)))), ((int)(((byte)(64)))), ((int)(((byte)(64)))));

this is the transperant colors.....once i put this its become totaly transparent....i don't want like that...i want like vista aero.....

even when i change the colour of this red...63....etc become another colours....

is there a way to add opercity function only to background ......???

something like (this.BackColor or backImage as opercity 0.90.... )

A S E L A

Christian Graus15-Mar-09 18:36

15-Mar-09 18:36

S K Y wrote:
System.Drawing.Color.FromArgb(((int)(((byte)(64)))), ((int)(((byte)(64)))), ((int)(((byte)(64)))));

Wow - that's kind of ridiculous. Why all the casting ?

S K Y wrote:
this is the transperant colors.....once i put this its become totaly transparent....i don't want like that...i want like vista aero.....

What are you talking about ? This is a grey, it's not transparent at all. Do you mean it's the mask color ?

S K Y wrote:
is there a way to add opercity function only to background ......???

Not really, no. You'd need to use an opacity mask, which I believe is supported, or you'd have to write code to create one. An opacity mask is where you have another bitmap where each matching pixel tells you the opacity of the same pixel on the main image.

Christian Graus

Driven to the arms of OSX by Vista.

S K Y15-Mar-09 21:13

S K Y

15-Mar-09 21:13

i want to make clear what u r tell...
r u telling to creat using code plane image and sent the opercity of that image. after that i should add that image as background image as my form....am i correct...???

A S E L A

#realJSOP16-Mar-09 2:53

#realJSOP

16-Mar-09 2:53

S K Y wrote:
is there a way to add opercity function only to background ......???

No.

But you can separate the background from the foreground, and draw each independently from the other, setting the alpha channel for the background to something lower than 1.0, while drawing the foreground with an alpha channel value of 1.0. However, that's not like Aero. Aero does the entire panel at the same alpha value.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

S K Y16-Mar-09 14:52

S K Y

16-Mar-09 14:52

do u have any link discribing more about this or...how should i search....i mean search as???

A S E L A

#realJSOP18-Mar-09 1:22

#realJSOP

18-Mar-09 1:22

Think about it - if you want to draw a control yourself, what do you need to do? You need to override the functionality to draw the control.

And yes, you need to search - I recommend google.

GridView and SEO

Feddo0415-Mar-09 15:13

Feddo04

15-Mar-09 15:13

Hi all...

I've GridView that contains around 10000 records. and I want to disable JavaScript doPostBack (Sorting and pageing)
I found many articles but I don't know who is the best Frown | :(

what is the best way to make it available for SEO?

thanks...

*Developer Day Scotland - Free community conference Delegate Registration Open

Colin Angus Mackay15-Mar-09 15:47

Colin Angus Mackay

15-Mar-09 15:47

Feddo04 wrote:
I've GridView that contains around 10000 records. and I want to disable JavaScript doPostBack (Sorting and pageing)

With so much data is disabling paging really a good idea?

Feddo04 wrote:
I found many articles but I don't know who is the best

Since you've not told us what articles you've found we can't really comment on them. I suggest trying out what they say and seeing what happens. Experimentation is an excellent form of learning.

Feddo04 wrote:
what is the best way to make it available for SEO?

SEO? Search Engine Optimisation?

Allow search engines to find it

Feddo0415-Mar-09 16:04

Feddo04

15-Mar-09 16:04

Hi Colin!
thanks for reply...

I think you didn't got me.
Ok....let me explain to you again.
of course I want to enable paging and sorting...("Who will put 10000 records without paging???!!!")
what I mean is the standard paging GridView is a Java Script. and then it'll not recognized by Google search or other search engine(SEO ("Search Engine Optimisation"))
So how to use GridView with a custom Paging ("without Java Script doPostBack") that what I didn't use it before.

Thank you...

*Developer Day Scotland - Free community conference Delegate Registration Open

Colin Angus Mackay15-Mar-09 16:11

Colin Angus Mackay

15-Mar-09 16:11

Feddo04 wrote:
I think you didn't got me.

That's why I was questioning what you appeared to be doing.

Feddo04 wrote:
So how to use GridView with a custom Paging ("without Java Script doPostBack") that what I didn't use it before

Don't use a GridView. Create your own version that does what you want.

I tend to end up using repeater controls because they are so much easier to work with and I actually know what it is doing.

Feddo0420-Mar-09 5:09

Feddo04

20-Mar-09 5:09

Hi!!
sorry for late..
I used Repeater control and it's working fine...(^^)

thank you so much....

Objects on another form

Jon Henry15-Mar-09 13:45

Jon Henry

15-Mar-09 13:45

mi working on a media player using window media player. I have a function setup on my main form where the media player object is.

public void playSong(string path)
{
    label4.Text = path;
    WMP.URL = path;
}

I have a class called utility that im using to pass in to the media player what I want to play. All works fine but one thing. In the class, I have to create a new instance of the object to gain access to the function.

public void playSelection(int ID)
{
     OleDbConnection musLibConn = new OleDbConnection();
     utility util = new utility();
     musLibConn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Program Files\GeneSys\Library.mdb";
     musLibConn.Open();

     OleDbCommand selLib = new OleDbCommand("SELECT Path FROM Library WHERE ID ="+ID, musLibConn);
     OleDbDataReader drLib = selLib.ExecuteReader();
     int idxPath = drLib.GetOrdinal("Path");
     drLib.Read();
     Path = (string)drLib.GetValue(idxPath);
     <big>frmMain frmMain = new frmMain();</big>
     frmMain.playSong(Path);
}

How can I gain access withot having to create the newobject so that I can use the media player instance that stays open on the main form all the time?

Christian Graus15-Mar-09 14:11

15-Mar-09 14:11

Jon Henry wrote:
frmMain frmMain = new frmMain();
frmMain.playSong(Path);

Well, this plain won't work, unless your control is static. Your best bet is to set up a delegate between the forms, so that this method calls a method on the main form. The other, hacky way, is to pass in a reference to your main form, or use Application.Forms[0], or I think there's a MainForm property, to get the main form ( you'd have to cast it to get access to the derived properties and methods );

Christian Graus

Driven to the arms of OSX by Vista.

Jon Henry15-Mar-09 14:30

Jon Henry

15-Mar-09 14:30

Could you elaborate a little on the methods between forms idea. I am a novice but if Im not mistaken, thats exactly what Im doing. The playSong method is on the main form and the playSelection method is in the class utility. IN the playSelection method, once i have the path I need I send it by way of calling playSong from the main form and passing the path. The problem is in order gain access to call the method playSong(situated on the frmMain) I have to create a a new instance of frmMain creating 2 main forms open with one playing the song and the original one sitting idle. I need to be able to reference the playSong method on the original instance of frmMain so that Im always using the same media player.

Again Im a novice s some of my terminology may be a little off.

Christian Graus15-Mar-09 18:39

15-Mar-09 18:39

OK, in the first instance, creating the second form is insane. Instead, you can pass the first form through using this, so that it becomes a variable inside the second class. This is the easy way, but not good practice.

Secondly, the right way is a delegate. A delegate is a function pointer, which can then be called in class a, but it executes code in class b. So set up a delegate that then calls a method in the main form, passing in the name of the file to start playing. If you google delegates, there's tons of examples, plenty of CP articles, etc.

Christian Graus

Driven to the arms of OSX by Vista.

bind property to selected row from datagridview

Natza Mitzi15-Mar-09 21:23

Natza Mitzi

15-Mar-09 21:23

You can use the form as a data member.

frmMain mFrmMain;

public void playSelection(int ID)
{
//Your code

if(mFrmMain == null || mFrmMain.IsDisposed || mFrmMain.IsClosed)
{
mFrmMain = new frmMain();
}

frmMain.playSong(Path);

}

BTW - you are not disposing your objects (OleDbConnection or forms)

Natza Mitzi

jogisarge15-Mar-09 10:15

jogisarge

15-Mar-09 10:15

Hi,

i have a Datagridview that shows a list of customers (List<customer>).
Now i have a property named selectedCustomer.

How can i bind the property to the selected row of my datagridview ?

bye jo

Re: bind property to selected row from datagridview

Mycroft Holmes15-Mar-09 14:09

Mycroft Holmes

15-Mar-09 14:09

I would use the selected item event to populate the customer object when it changes. AFAIK you can't bind a property, it is not a control.

Never underestimate the power of human stupidity
RAH

generate code dynamically ?

Mubeen.asim15-Mar-09 9:53

Mubeen.asim

15-Mar-09 9:53

hello....
i have been used to php scripting and may i know is it possible to dynamically generate the code in the program like echoing the html code at the time of the script running and is the same process possible in c#...

Re: generate code dynamically ?

Pete O'Hanlon15-Mar-09 10:03

Pete O'Hanlon

15-Mar-09 10:03

You can use the CodeDOM classes to do this.

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character recognition

Swati Khanna15-Mar-09 7:15

Swati Khanna

15-Mar-09 7:15

How to recognise a character like A , C, M,W,Q etc.

I wanted to know if there is any other algorithm for this except feature extraction and if feature extraction is the one to be used then how do i implement it in C#.

thanks in advance

Re: character recognition

Xmen Real 15-Mar-09 7:48

Xmen Real

15-Mar-09 7:48

http://www.codeproject.com/KB/GDI-plus/Image_Processing_Lab.aspx[^]

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%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
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Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Re: character recognition

Christian Graus15-Mar-09 10:11