How do I make a line between lots of strings

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i have made a program that finds new files in two folders however, this is what it outputs: file.txtfile.txtfile.txt

and i would like it to output:
file.txt
file.txt
file.txt

please can someone help me

What I have tried:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog fdb = new FolderBrowserDialog();
            if (fdb.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                oldtextbox.AppendText(fdb.SelectedPath);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            string oldpath = oldtextbox.Text;
            string newpath = newtextbox.Text;

            string str = oldpath;
            string str1 = newpath;
            List<string> strs = new List<string>();
            string[] files = Directory.GetFiles(str);
            for (int i = 0; i < (int)files.Length; i++)
            {
                strs.Add(Path.GetFileName(files[i]));
            }
            List <string> strs1 = new List<string>();
            string[] strArrays = Directory.GetFiles(str1);
            for (int j = 0; j < (int)strArrays.Length; j++)
            {
                strs.Add(Path.GetFileName(strArrays[j]));
            }
#T H E   T E X T   I S   U N D E R   H E R E
            richTextBox1.AppendText(string.Concat(strs));
        }
        private void button1_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog fdb = new FolderBrowserDialog();
            if (fdb.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                newtextbox.AppendText(fdb.SelectedPath);
        }
    }

}

Posted 17-Jul-18 9:52am

Member 13915301

Updated 17-Jul-18 10:17am

v3

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Eric Lynch · Answer 1 · 2018-07-17T09:57:00

Assuming your text box is set to multi-line...

newtextbox.AppendText("\n");

EDIT: Based on additional information, this is the revised solution.

It appears you are trying to concatenate the file names from two different directories (unhelpfully named str and str1).

First, I would build the sequence of file names using LINQ (make sure to include a using for System.Linq).

List<string> fileNames = Directory.EnumerateFiles(str)
  .Concat(Directory.EnumerateFiles(str1))
  .Select(path => Path.GetFileName(path))
  .ToList();

richTextBox1.AppendText(string.Join("\n", fileNames));

I'll take a sec to explain the parts. Directory.EnumerateFiles(str) returns an enumeration of file paths in the specified path (str).

Then, .Concat(Directory.EnumerateFiles(str1)) concatenates an enumeration of file paths in a second specified path (str1) onto the end of the original enumeration.

Next, .Select(path => Path.GetFileName(path)) modifies the concatenated enumeration so that it now consists of the file name for each path.

Next, .ToList() creates a list from the enumeration.

Finally, string.Join("\n", fileNames) places a new line character between each element of fileNames.

I highly suggest taking a moment to learn LINQ. Its very powerful when you are manipulating sequences of items.