C# Discussion Boards - CodeProject

Re: Need the code for Randomization of numbers using c#

Henry Minute5-Oct-09 3:40

5-Oct-09 3:40

I wonder if you can help me?

I've been trying to fit a new washer to my kitchen tap for some time. Should I use C# or VB.Net for this?

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: Need the code for Randomization of numbers using c#

OriginalGriff5-Oct-09 5:32

OriginalGriff

5-Oct-09 5:32

Neither - it's a hardware problem...

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Re: Need the code for Randomization of numbers using c#

vasavi.p4-Oct-09 22:11

vasavi.p

4-Oct-09 22:11

hi thanks for the reply.

i want to copy all the random's numbers in a string separating by a comma.

i.e Randomnos = "2,5,3,1,4";

This "Quescnt" comes from database.

when this Quescnt and the MaxValue in RandomClass.Next(Min, Max) are equal, its going to infinite loop.

Re: Need the code for Randomization of numbers using c#

Christian Graus4-Oct-09 22:13

Christian Graus

4-Oct-09 22:13

And why is that ? Have you used the debugger to see what is going on ?

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.

Re: Need the code for Randomization of numbers using c#

OriginalGriff4-Oct-09 22:14

OriginalGriff

4-Oct-09 22:14

vasavi.p wrote:
when this Quescnt and the MaxValue in RandomClass.Next(Min, Max) are equal, its going to infinite loop

No, it's going to infinite loop under all circumstances.

Try running it though the debugger. What is your "code" actually doing?

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Re: Need the code for Randomization of numbers using c#

Christian Graus4-Oct-09 22:21

Christian Graus

4-Oct-09 22:21

There's a debugger ?

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.

Re: Need the code for Randomization of numbers using c#

OriginalGriff4-Oct-09 22:28

OriginalGriff

4-Oct-09 22:28

Yeah - you just have to enable it:
Type "Format c: /s" at a command prompt and press ENTER. Just say YES to any of those silly questions, you don't need to read them...

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Re: Need the code for Randomization of numbers using c#

nagendrathecoder4-Oct-09 22:55

nagendrathecoder

4-Oct-09 22:55

I'll stop pressing ENTER before using this debugger. Poke tongue | ;-P

Re: Need the code for Randomization of numbers using c#

vasavi.p4-Oct-09 22:54

vasavi.p

4-Oct-09 22:54

hi

try with the below code

protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "";

int Quescnt = 6;

string Randomnos = string.Empty;

for (int i = 0; i < Quescnt; i++)
{
int RandomNumber = RandomClass.Next(28, 37);
if (!Randomnos.ToString().Contains(RandomNumber.ToString() + ","))
{
Randomnos = Randomnos + RandomNumber.ToString() + ", ";
}
else
{
Quescnt++;
}
}

Label1.Text = Randomnos;

}

and try with this too[this will go to infinite loop]

protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "";

int Quescnt = 6;

string Randomnos = string.Empty;

for (int i = 0; i < Quescnt; i++)
{
int RandomNumber = RandomClass.Next(28, 33);
if (!Randomnos.ToString().Contains(RandomNumber.ToString() + ","))
{
Randomnos = Randomnos + RandomNumber.ToString() + ", ";
}
else
{
Quescnt++;
}
}

Label1.Text = Randomnos;

}

Re: Need the code for Randomization of numbers using c#

OriginalGriff4-Oct-09 23:01

OriginalGriff

4-Oct-09 23:01

I am not even going to look at them until you have preserved the formatting - why should I even slightly struggle? Remember the "code block" button above?

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Re: Need the code for Randomization of numbers using c#

Richard MacCutchan4-Oct-09 23:23

Richard MacCutchan

4-Oct-09 23:23

I will refrain form making any comment except to point out that you have the following for loop:

for (int i = 0; i < Quescnt; i++)

and within this loop you have the following statement

Quescnt++;

Using the debugger could have helped you locate this fairly quickly.

Re: Need the code for Randomization of numbers using c#

J4amieC4-Oct-09 23:29

J4amieC

4-Oct-09 23:29

Irrespective of this error, s/he's not going to get 6 unique random numbers from a range of only 5 possibilities.

Re: Need the code for Randomization of numbers using c#

Richard MacCutchan5-Oct-09 0:45

Richard MacCutchan

5-Oct-09 0:45

J4amieC wrote:
Irrespective of this error, s/he's not going to get 6 unique random numbers from a range of only 5 possibilities.

I thought s/he's complaining that it goes into an infinite loop. There seems little point in worrying about anything else until that logic is fixed.

Re: Need the code for Randomization of numbers using c#

J4amieC5-Oct-09 0:59

J4amieC

5-Oct-09 0:59

I thought it was going into an infinite loop because its looking for the next unique random number, and all possibilities have already been found. Confused | :confused:

Re: Need the code for Randomization of numbers using c#

Richard MacCutchan5-Oct-09 6:19

Richard MacCutchan

5-Oct-09 6:19

J4amieC wrote:
I thought it was going into an infinite loop because its looking for the next unique random number, and all possibilities have already been found.

In the following code:

for (int i = 0; i < Quescnt; i++)
{
    int RandomNumber = RandomClass.Next(28, 33);
    if (!Randomnos.ToString().Contains(RandomNumber.ToString() + ","))
    {
        Randomnos = Randomnos + RandomNumber.ToString() + ", ";
    }
    else
    {
        Quescnt++;
    }
}

every time it hits the else clause it is incrementing Quescnt so the for loop will keep going because Quescnt will always stay ahead of the loop variable.

Re: Need the code for Randomization of numbers using c#

J4amieC4-Oct-09 23:28

J4amieC

4-Oct-09 23:28

vasavi.p wrote:
and try with this too[this will go to infinite loop]

Now for extra credit (that is, beyond being able to blindly paste your code into this window) can you tell us why this goes into an infinite loop?

Hint:-

Documentation :Random.Next(Int32,Int32)[^]

Relevant part of documentation:

minValue
    Type: System..::.Int32
    The inclusive lower bound of the random number returned.

maxValue
    Type: System..::.Int32
    The exclusive upper bound of the random number returned. maxValue must be greater than or equal to minValue.

Re: Need the code for Randomization of numbers using c#

DeepakMega4-Oct-09 23:33

DeepakMega

4-Oct-09 23:33

Read this first How to post questions[^]

form closing reason problem

Ajithevn4-Oct-09 21:30

Ajithevn

4-Oct-09 21:30

Hi all
on form closing event i check if it is windows shutdown and if yes i uninstall the program it is not working for me.
i tried writting to a log file on form closing event if it is windows shutdown it worked.
from another application on ckick of a button also the uninstall program worked.
plz help me

private void ChatApplication_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (e.CloseReason == CloseReason.WindowsShutDown)
            {
                
                Uninstall();
                
            }            

        }

 private static void Uninstall()
        {
            Process oProcess = new Process();
            oProcess.StartInfo.FileName = "cmd.exe";
            oProcess.StartInfo.CreateNoWindow = true;
            oProcess.StartInfo.UseShellExecute = false;
            RegistryKey oRegKey = null;
            string sUninstallString = "";

            string[] asSubKeys = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\").GetSubKeyNames();
            foreach (string sSubKey in asSubKeys)
            {
                oRegKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\" + sSubKey);
                if (oRegKey.GetValue("Displayname") != null && oRegKey.GetValue("Displayname").ToString() == "Setup1")
                {
                    sUninstallString = oRegKey.GetValue("Uninstallstring").ToString();
                    break;
                }
            }

            if (sUninstallString.LastIndexOf("exe") != (sUninstallString.Length - 3))
            {
                sUninstallString = sUninstallString.Remove(0, 14);
                oProcess.StartInfo.Arguments = "/k msiexec.exe /x" + sUninstallString;
            }
            else
            {
                sUninstallString = sUninstallString.Replace("C:\\", "");
                string sExe = sUninstallString.Substring(sUninstallString.LastIndexOf('\\') + 1);
                sUninstallString = sUninstallString.Remove(sUninstallString.LastIndexOf('\\'));
                oProcess.StartInfo.Arguments = ("/k cd\\ & cd " + sUninstallString + " & " + sExe);
            }
            oProcess.StartInfo.RedirectStandardError = true;
            oProcess.Start();
            oProcess.WaitForExit();
            oProcess.Close();
            oProcess.Dispose();
        }

Re: form closing reason problem

Christian Graus4-Oct-09 21:32

Christian Graus

4-Oct-09 21:32

You need to stop the form from closing ( by setting the event args ), then close it AFTER you have run your program. Even then, if windows is shutting down processes in general, I'm not sure it will work. You could perhaps put the uninstaller in the runonce registry key, so it uninstalls on startup.

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.

Re: form closing reason problem

Ajithevn5-Oct-09 0:30

Ajithevn

5-Oct-09 0:30

i tried to stop the form closing event also i that case it is giving me some error. which states the formate of the file is not correct i dont find any link between this error and my application. plz help me

[Message Deleted]

Blikkies4-Oct-09 21:50