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Re: How to get listbox items to string?

dule4327-Aug-09 15:07

dule43

27-Aug-09 15:07

foreach (DataRowView item in listBox.Items)
{
txtBox.Text += item.Row["RowNameYouWant"].ToString() + "\n";
}

random number generation

givya14-Jul-09 21:02

givya

14-Jul-09 21:02

i wanna know how to create random numbers in c#. in my application i need to provide a default password if the user forgets the password. i wanna give this default password in the form of random numbers. pls help...

Re: random number generation

SeMartens14-Jul-09 21:04

SeMartens

14-Jul-09 21:04

Hi,

the .NET framework provides a Random-class. Have a look here: http://msdn.microsoft.com/en-us/library/system.random.aspx[^]

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: random number generation

Rajesh R Subramanian14-Jul-09 21:05

Rajesh R Subramanian

14-Jul-09 21:05

Hello Givya,

Have you tried searching[^]?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: random number generation

himanshu256114-Jul-09 21:13

himanshu2561

14-Jul-09 21:13

Hi Use Random class like

Random r = new Random();

givya wrote:
in my application i need to provide a default password if the user forgets the password

IMO ,If possible try to provide forgot password functionality like [Hint Question or Alternate Email]...

himanshu

Re: random number generation

givya15-Jul-09 2:27

givya

15-Jul-09 2:27

I gave the following code to generate the random string(searched it on internet).
private string RandomString(int size, bool lowerCase)
{

StringBuilder builder = new StringBuilder();
Random random = new Random();
char ch;
for (int i = 0; i < size; i++)
{
ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);
}
if (lowerCase)
return builder.ToString().ToLower();
return builder.ToString();
}

Bt its giving the following error:

A using namespace directive can only be applied to namespaces; 'System.Text.StringBuilder' is a type not a namespace

I hav used this also: "using System.Text.StringBuilder;"

Pls help

Need help.

mjawadkhatri14-Jul-09 20:56

mjawadkhatri

14-Jul-09 20:56

Hi.
i get system date in this format "mm/dd/yyyy" like "07/15/2009" now i want to change date format like this "15-JUL-2009"
how can i do??

thanks in Advance

jawad khatri

Re: Need help.

SeMartens14-Jul-09 21:01

SeMartens

14-Jul-09 21:01

Hi,

take a look at MSDN: http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^]

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Need help.

K030614-Jul-09 21:07

K0306

14-Jul-09 21:07

Try this

            DateTime dt = DateTime.Now;
            MessageBox.Show(dt.ToString("dd/MMM/yyyy"));
            <pre> 

<div class="ForumSig">Regards,
Karthik K...</div>

Re: Need help.

mjawadkhatri14-Jul-09 21:18

mjawadkhatri

14-Jul-09 21:18

thanks

Re: Need help.

sarinsps14-Jul-09 21:47

sarinsps

14-Jul-09 21:47

see this use this namespace
System.Globalization;
DateTimeFormatInfo DTFI = new CultureInfo("hi-IN", false).DateTimeFormat;
//here 'hi-EN' represent the Hindi-INDIA Indian culture here georgian
//calender formate ie dd/MM/yy

DTFI.DateSeparator = ":";
Label1.Text = DTFI.Calendar.ToString();
//we will ge the calender in formation

Label1.Text = DTFI.FullDateTimePattern.ToString();
//give the Date/time/year formate of that culture

Label1.Text = DTFI.LongDatePattern;

Label1.Text = DTFI.ShortDatePattern;

zedgraph control

hamidhakimi14-Jul-09 20:49

hamidhakimi

14-Jul-09 20:49

please help me
I want fill color between two curves in the zedgraph control.please help me.

Saving JPEG image

GauravKP14-Jul-09 20:30

GauravKP

14-Jul-09 20:30

I want to save jpg image 100 X 150 size in color format of 256color to reduce its size ..........
suggest me any c# function

Re: Saving JPEG image

Adam R Harris14-Jul-09 20:36

Adam R Harris

14-Jul-09 20:36

Look Here[^]

Next time at least try this[^].

P.S

it's the 7th link

Re: Saving JPEG image

benjymous14-Jul-09 22:08

benjymous

14-Jul-09 22:08

btw, there's no such thing as a 256 color jpeg

Help me! I'm turning into a grapefruit!
Buzzwords!

Re: Saving JPEG image

Abdul Rahman Hamidy15-Jul-09 0:02

Abdul Rahman Hamidy

15-Jul-09 0:02

this can help you

Image img=new Bitmap("filepath.jpg");
Bitmap bmp=null;
for(int i=0;i<img.Width;i++)
{
  for(int j=0;j<img.Height;j++)
  {
	Color col=img.GetPixel(i,j);
	int avg=((col.R+col.G+col.B)/3);
	img.SetPixel(i,j,Color.FromArgb(avg,avg,avg));	
  }
}
MemoryStream mem=new MemoryStream();
img.Save(mem,ImageFormat.Gif);
bmp=new Bitmap(mem);
this.pictureBox1.Image=bmp;

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: Saving JPEG image

benjymous15-Jul-09 0:14

benjymous

15-Jul-09 0:14

Very nice, but that still doesn't make a 256 colour jpg (from what I can tell, it'd make a greyscale gif), which isn't what the OP wanted

Help me! I'm turning into a grapefruit!
Buzzwords!

Re: Saving JPEG image

Abdul Rahman Hamidy15-Jul-09 0:58

Abdul Rahman Hamidy

15-Jul-09 0:58

i know i only mentioned, that can help Smile | :)

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: Saving JPEG image

Abdul Rahman Hamidy15-Jul-09 1:07

Abdul Rahman Hamidy

15-Jul-09 1:07

this can possible help you.http://www.geekpedia.com/tutorial232_Reducing-JPEG-Picture-Quality-using-Csharp.html[^]

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Closing COM-Interop Application

Jürgen Jung14-Jul-09 20:11

Jürgen Jung

14-Jul-09 20:11

I have a simple C#-(Windows-)Application. The Main-Form has two COM-Members. Working with this variables is ok, everything works as expected. When i close the application by the menu, i call Close() in the event-handler and everything is ok, but when i close by systemmenu or alt-f4 i got a com-leak. What is the reason, what is missing ?

Re: Closing COM-Interop Application

SeMartens14-Jul-09 21:03

SeMartens

14-Jul-09 21:03

Hi,

sorry for asking you, but what is a COM-leak? How does you know it is one? (Exception, error etc.?)

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Closing COM-Interop Application

Jürgen Jung14-Jul-09 21:08

Jürgen Jung

14-Jul-09 21:08

At the end of the programm, INSIDE the COM-Component it is checked wether all references are "freed", this means if the refcounts are down to zero. The component is not only one single object, instead the library contains an object-hierarchy.

Re: Closing COM-Interop Application

SeMartens14-Jul-09 21:20

SeMartens

14-Jul-09 21:20

It is possible to "hook" into the event if Alt-F4 is called. Do you got a Forms-application? If yes you can register an event handler for FormClosing. Within this handler you can call the close-method for your COM.

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Closing COM-Interop Application

Jürgen Jung14-Jul-09 21:23

Jürgen Jung

14-Jul-09 21:23

If have tried Form_Closed and/or Form_Closing event to call Marshal.ReleaseCOMObject(). But it doesn't help,

Re: Closing COM-Interop Application

SeMartens14-Jul-09 21:29

SeMartens

14-Jul-09 21:29

Hmmmm... Other way could be to go into the Dispose()-method of the form and to call the release-method there.

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Last Visit: 31-Dec-99 18:00 Last Update: 12-Oct-24 19:13

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