Randomise a name

[angelica]

hey,

I am inserting a names in a textbox one by one and I would like to randomise a name in the arraylist. Can anyone help me continue this bit with randomising please
Thanks

namespace Arraylist1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string nums;
        ArrayList m_text = new ArrayList();
	    string  text_line;
        private void button1_Click(object sender, EventArgs e)
                    
{
	  
       text_line = textBox1.Text;
            if( text_line != null )
        	{      
	// insert the line at the back of the container
		
            m_text.Add( text_line );
        
        nums = Convert.ToString(m_text.Count);
        textBox1.Text = "";
                     
	        }
            	      
}        
        private void button2_Click(object sender, EventArgs e)
        {  // let's see how many we actually added ...
            MessageBox.Show("We inserted" + nums + " items");

            *******************               
        }
    }

}

[dee-u]

Could you try this if it will work for you?

public static void ShuffleArray(ArrayList source)
{
Random rnd = new Random();
for (int inx = source.Length-1; inx > 0; --inx)
{
int position = rnd.Next(inx);
object temp = source[inx];
source[inx] = source[position];
source[position] = temp;
}
}

[youquijano]

try this

private void btnEnter_Click(object sender,EventArgs e) {
if(!string.IsNullOrEmpty(textName.Text.Trim())) {
listBox1.Items.Add(textName.Text);
textName.Clear();
textName.Focus();
}
}

private void btnRandomise_Click(object sender,EventArgs e) {
Random rnd = new Random();
List<string> randomised = new List<string>();
int cntr = 0;
while(cntr != listBox1.Items.Count) {
int pos = rnd.Next(1,listBox1.Items.Count + 1);
if(!listBox2.Items.Contains(listBox1.Items[pos - 1].ToString())
/*&& !randomised.Contains(listBox1.Text[pos-1].ToString())*/) {
listBox2.Items.Add(listBox1.Items[pos - 1]);
randomised.Add(listBox1.Items[pos - 1].ToString());
cntr++;
}
}
}

[angelica]

hi Dee-u,

Im trying to implement your function. I have included this function in a button event but nothing is happening.

What I need to hav ethe program do is for the user to enter some names one by one that is refreshed but a button click. Then I need to randomise the names and displayed in a label. I guess this last bit of label displayed is missing however I dont know how to continue.

One more thing pls can you do some inline comments along with each line so as to follow better.

Many thanks

[youquijano]

have you seen my code?

try this

private void btnEnter_Click(object sender,EventArgs e) {
if(!string.IsNullOrEmpty(textName.Text.Trim())) {
listBox1.Items.Add(textName.Text);
textName.Clear();
textName.Focus();
}
}

private void btnRandomise_Click(object sender,EventArgs e) {
Random rnd = new Random();
List<string> randomised = new List<string>();
int cntr = 0;
while(cntr != listBox1.Items.Count) {
int pos = rnd.Next(1,listBox1.Items.Count + 1);
if(!listBox2.Items.Contains(listBox1.Items[pos - 1].ToString())
/*&& !randomised.Contains(listBox1.Text[pos-1].ToString())*/) {
listBox2.Items.Add(listBox1.Items[pos - 1]);
randomised.Add(listBox1.Items[pos - 1].ToString());
cntr++;
}
}
}

i think this is what you need ?

[dee-u]

This works for me

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        ArrayList ar = new ArrayList();
 
        private void Form1_Load(object sender, EventArgs e)
        {
            ar.Add("dee-u1");
            ar.Add("dee-u2");
            ar.Add("dee-u3");
            ar.Add("dee-u4");
            ar.Add("dee-u5");
        }
 
        public static void ShuffleArray(ArrayList source)
        {
            Random rnd = new Random();
            for (int inx = source.Count - 1; inx > 0; --inx)
            {
                //get new randon number
                int position = rnd.Next(inx);
                //temporarily store the value of source[inx] to a variable
                object temp = source[inx];
                //set the value of the current index (inx) to the value of the item found
                //on the random position generated earlier
                source[inx] = source[position];
                //put the earlier stored value to the location of the new randon generator
                //which swaps their position
                source[position] = temp;
            }
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            ShuffleArray(ar);
            listBox1.Items.Clear();
            for (int a = 0; a <= ar.Count - 1; a++)
            {
                listBox1.Items.Add(ar[a].ToString());
            }
        }
    }
}