C# Discussion Boards - CodeProject

Natza Mitzi8-Mar-09 9:58

8-Mar-09 9:58

TRy not to use so many controls since they consume a lot of resources.
To test the true performance use Release mode and not DEBUG mode.
There are plenty of articles discussing custom controls and overriding OnPaint.
Here is a small sample:

///

/// A custom control
///

public class MyUserControl : UserControl
{

#region Constructors and Initializers

///

/// Initializes the <c>ChartControl.
///

public MyUserControl()
{

SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.Opaque, true);
UpdateStyles();
InitializeComponent();
}

#region Event Overrides

protected override void OnPaintBackground(System.Windows.Forms.PaintEventArgs pevent)
{
//Do Nothing
}

protected override void OnPaint(PaintEventArgs args)
{
//Paint logic (first call graphics.Clear(BackgoundColor)
// Start drawing
}

#endregion
}

Natza Mitzi

Multiple Record Insert

shafiullah1237-Mar-09 1:19

shafiullah123

7-Mar-09 1:19

Hi Folks,

I want to insert 6 rows of data of Six week days into SQL Server 2008 database from a single C# windows form. I want to use a data grid view....... Please suggest how to logically achieve it....on single click of "Save" button in bindingnavigator i want to insert all 6 records in
Database. I am using Visual Studio 2008 SP1.... pls help

regards
shafi

Re: Multiple Record Insert

fly9047-Mar-09 8:23

fly904

7-Mar-09 8:23

hmmm pie

Changing size of Array at Runtime

nagendrathecoder7-Mar-09 1:11

nagendrathecoder

7-Mar-09 1:11

Hello Friends,

How can i change the size of an Array at runtime in C#.Net.

In VB.Net, i can do it using "ReDim" & "Preserve" keywords.

Is there anything similar in C#.Net, so we can change the size at runtime?

Thanks and Regards,
Nagendra.

Re: Changing size of Array at Runtime

Aghosh Babu7-Mar-09 1:19

Aghosh Babu

7-Mar-09 1:19

use arraylist instead?

Re: Changing size of Array at Runtime

nagendrathecoder7-Mar-09 1:24

nagendrathecoder

7-Mar-09 1:24

Can we use MultiDimensional ArrayList?

Re: Changing size of Array at Runtime

Aghosh Babu7-Mar-09 1:30

Aghosh Babu

7-Mar-09 1:30

I hope multidimensional arraylist can be done by, Each element of the ArrayList would then be another ArrayList.

ArrayList a = new ArrayList();
a.Add(new ArrayList());

Re: Changing size of Array at Runtime

nagendrathecoder7-Mar-09 1:34

nagendrathecoder

7-Mar-09 1:34

ok thanks, i'll try this. Smile | :)

Re: Changing size of Array at Runtime

Luc Pattyn7-Mar-09 1:42

Luc Pattyn

7-Mar-09 1:42

Hi,

In all .NET languages one-dimensional arrays can be resized, see the Array.Resize() method in the documentation. "This method allocates a new array with the specified size, copies elements from the old array to the new one, and then replaces the old array with the new one."

When you need to resize an array several times, or if you just don't know what size to choose at the start, you are probably better off choosing another kind of collection. The old ArrayList still exists, but it is better to use a generic list (that's List<T> ) which provides type checking and better performance. These collections grow and shrink dynamically without copying their content [ADDED] all the time (in the current implementation they grow by rounding up their capacity to the next power of 2 and copying only then).[/ADDED]

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

- before you ask a question here, search CodeProject, then Google
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modified on Sunday, June 12, 2011 9:13 AM

Re: Changing size of Array at Runtime

harold aptroot7-Mar-09 3:21

harold aptroot

7-Mar-09 3:21

Actually List<t> does copy all its elements when it needs to grow.
Go to System.Collections.Generic.List<t>.set_Capacity(int value) in for example Red Gate's .NET Reflector..

Re: Changing size of Array at Runtime

Luc Pattyn7-Mar-09 3:38

Luc Pattyn

7-Mar-09 3:38

Right. I keep forgetting that. Back to the home-made linked lists then. Laugh | :laugh:

Luc Pattyn [Forum Guidelines] [My Articles]

modified on Sunday, June 12, 2011 9:13 AM

How to save application settings in .net C# CF?

Aghosh Babu7-Mar-09 1:01

Aghosh Babu

7-Mar-09 1:01

i am developing a windows mobile C# application, how to save application settings? The user should be able to update these settings, but the settings want to be retrieved next time application starts. Do i need to use registry key? or xml config? any other good way to achevie this??

Re: How to save application settings in .net C# CF?

Natza Mitzi8-Mar-09 10:14

Natza Mitzi

8-Mar-09 10:14

Try and save the data to a path such as:
Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);

You can serialize your data in xml/binary format.
I prefer not to write to the registry, that is dirty.

Natza Mitzi

Re: How to save application settings in .net C# CF?

Aghosh Babu8-Mar-09 18:26

Aghosh Babu

8-Mar-09 18:26

i will be gratefull, if u can giv me some sample codes to refer to...

Re: How to save application settings in .net C# CF?

Natza Mitzi8-Mar-09 22:48

Natza Mitzi

8-Mar-09 22:48

I just tried to write the code discussed and is seems like there is no serialization mechanism. You need to write a mechanism and you can find one here:
http://www.codeproject.com/KB/mobile/SaveSettings.aspx[^]

Natza Mitzi

change date format using c#

Abdul Rahman Hamidy7-Mar-09 0:58

Abdul Rahman Hamidy

7-Mar-09 0:58

Dear All, I am looking to change the date format of my computer same as changing it from control panel using c#.
any info please?

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: change date format using c#

Xmen Real 7-Mar-09 4:18

Xmen Real

7-Mar-09 4:18

http://msdn.microsoft.com/en-us/library/zdtaw1bw.aspx[^]

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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: change date format using c#

Abdul Rahman Hamidy7-Mar-09 18:28

Abdul Rahman Hamidy

7-Mar-09 18:28

the article does not change the date setting as control panel.the article only changes date format to string in run time. what i want is to change the date format as i am changing from control panel.
this means i want to change computer date format from c# application and it should affect control panel too.

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: change date format using c# [modified]

Bishoy Rasmy17-Nov-09 23:25

Bishoy Rasmy

17-Nov-09 23:25

There is 2 ways to change your system date time in .Net
1st by changing the culture of the running thread

CultureInfo culture = (CultureInfo)CultureInfo.CurrentCulture.Clone(); 
            culture.DateTimeFormat.ShortDatePattern = "dd-MMM-yyyy"; 
            culture.DateTimeFormat.LongTimePattern = ""; 
            Thread.CurrentThread.CurrentCulture = culture;

2nd change the computer format

Structure SYSTEMTIME
Public wYear As Short 
Public wMonth As Short 
Public wDayOfWeek As Short 
Public wDay As Short 
Public wHour As Short 
Public wMinute As Short 
Public wSecond As Short 
Public wMilliseconds As Short
End Structure 
‘’’import the user32.dll (import the System.Runtime.InteropServices namespace):
'&lt;DllImport("kernel32.dll", setLastError:=True)&gt;
public shared function SetSystemTime(byref theDateTime as SYSTEMTIME) as Boolean 
End Function 
Dim newDateTime as SystemTime()newDateTime.wDay = valueHereif SetSystemTime(newDateTme) then   'cool, we set it successfullyend if

modified on Wednesday, November 18, 2009 5:32 AM

How to create a wrapper class in c#.net?

sreenivasaraok7-Mar-09 0:35

sreenivasaraok

7-Mar-09 0:35

HI,
I have customer class. i want to create the wrapper class fot this?

how to create wrapmper class for the customer?

What is wrapper class?

Re: How to create a wrapper class in c#.net?

Calin Tatar7-Mar-09 0:43

Calin Tatar

7-Mar-09 0:43

See Wrapper patern[^]

Also take a look at the following link for a sample[^]

Calin

Re: How to create a wrapper class in c#.net?

Christian Graus2-Jun-10 20:30

Christian Graus

2-Jun-10 20:30

Why would you want to add something, if you don't even know what the thing you want to add, actually is ?

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

How can I install a db schema while installing a program?

dejmjin6-Mar-09 22:59

dejmjin

6-Mar-09 22:59

Hi guys,

I am trying to make my setup project which is installing my program, install also the db schema I am using. I am using these technologies; vs2008 (c#) and sql server 2005.

I have already built a setup project and is installing the project, but without the db schema. Anyone can help me how to accomplish this please?

Thanks

dejmjin

Re: How can I install a db schema while installing a program?

Calin Tatar6-Mar-09 23:55

Calin Tatar

6-Mar-09 23:55

You have to add a custom action to your installer.

Have a look here[^].

Calin

Re: How can I install a db schema while installing a program?

dejmjin7-Mar-09 0:04

dejmjin

7-Mar-09 0:04

Thanks Calin...I will try this solutions. Seems good for my problem

Thanks again!

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