IndexOf in listBox.

Question

Hi All ,
In my listBox have line count and data.I want show in listBox2 items is line only without the data.
Line 0 to 7.In listbox show" 2 and 3" or " 1,2 and 3".
I want use IndexOf code to remove that Data.

Text File;=7508,7989,5177,5894,8711,5618,7784,0772,1148,2302,3007,0445,7829,5254,0672,6012,2931,8558,9004,8286,4251,3918,4525
3142,8140,0147,1022,9497,6486,2969,3132,1470,5048,0440,0720,3074,2699,5176,7436,0573,6838,3996,2816,5044,0842,2215
6777,0370,0622,5686,7406,5002,8392,1134,8105,3722,8120,7627,9722,9637,2796,6892,2386,2467,8991,3882,8678,3000,2243
9833,3856,8514,5533,4623,4715,6821,2943,4246,4592,8990,2299,3000,1630,1635,1426,7648,8883,9426,1357,0309,7176,2005
1510,4365,6184,3709,2544,8940,3138,6743,0193,6703,2157,3618,4561,7326,6067,1156,6705,8319,4406,3085,8871,0661,9861
8403,1980,5490,7606,6127,6431,4916,0421,0111,0495,9858,0020,8117,2913,6913,8912,1929,9174,1653,0722,2143,2283,6557
2895,3572,9580,2712,3854,7385,2866,1925,8168,3931,8140,1541,3263,2393,5656,9860,4136,8550,7844,2627,1576,5170,2300
1109,7796,6815,2226,1854,1001,7718,0956,3157,4504,2122,2151,0788,9371,1838,1155,9435,0502,1337,7646,0096,0757,6351

Here is code test;

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.IO;  
using System.Linq;  
using System.Text;  
using System.Threading.Tasks;  
using System.Windows.Forms;  
  
namespace ListB_1  
{  
    public partial class Form1 : Form  
    {  
        List<string> Data1 = new List<string>();  
        List<string> Data2 = new List<string>();  
  
        public Form1()  
        {  
            InitializeComponent();  
        }  
  
        private void Form1_Load(object sender, EventArgs e)  
        {  
            int linecount = 0;  
  
            foreach (var s in File.ReadLines(@"C:\Users\family\Documents\Ahad.txt"))  
            {  
                listBox1.Items.Add(linecount++ + " " + s);  
                Data1.Add(linecount.ToString() + " " + s);  
  
            }  
        }  
  
        private void button1_Click(object sender, EventArgs e)  
        {  
            string a = "";  
            string b = "";  
  
            for (int i = 0; i < listBox1.Items.Count; i++)  
            {  
                a = listBox1.Items[5].ToString();  
                b = listBox1.Items[6].ToString();  
            }  
            listBox2.Items.Add(a);  
            listBox2.Items.Add(b);  
  
  
        }  
  
        private void button2_Click(object sender, EventArgs e)  
        {  
  
  
        }  
    }  
}  


  

Answer 1

@ MiPakTeh-6272 , If you want to show only the linecount in the listbox2, there is no need to use Indexof method to remove it.

You could try the following code.

 private void button1_Click(object sender, EventArgs e)  
        {  
  
            for (int i = 0; i < listBox1.Items.Count; i++)  
            {  
                listBox2.Items.Add(i);  
            }  
           
        }  

If this still exists the problem, please feel free to let me know.

Best Regards,
Jack

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