Копирование файла в выбранную папку

// Simple synchronous file copy operations with no user interface.
// To run this sample, first create the following directories and files:
// C:\Users\Public\TestFolder
// C:\Users\Public\TestFolder\test.txt
// C:\Users\Public\TestFolder\SubDir\test.txt
public class SimpleFileCopy
{
    static void Main()
    {
        string fileName = "test.txt";
        string sourcePath = @"C:\Users\Public\TestFolder";
        string targetPath =  @"C:\Users\Public\TestFolder\SubDir";
 
        // Use Path class to manipulate file and directory paths.
        string sourceFile = System.IO.Path.Combine(sourcePath, fileName);
        string destFile = System.IO.Path.Combine(targetPath, fileName);
 
        // To copy a folder's contents to a new location:
        // Create a new target folder, if necessary.
        if (!System.IO.Directory.Exists(targetPath))
        {
            System.IO.Directory.CreateDirectory(targetPath);
        }
 
        // To copy a file to another location and 
        // overwrite the destination file if it already exists.
        System.IO.File.Copy(sourceFile, destFile, true);
 
        // To copy all the files in one directory to another directory.
        // Get the files in the source folder. (To recursively iterate through
        // all subfolders under the current directory, see
        // "How to: Iterate Through a Directory Tree.")
        // Note: Check for target path was performed previously
        //       in this code example.
        if (System.IO.Directory.Exists(sourcePath))
        {
            string[] files = System.IO.Directory.GetFiles(sourcePath);
 
            // Copy the files and overwrite destination files if they already exist.
            foreach (string s in files)
            {
                // Use static Path methods to extract only the file name from the path.
                fileName = System.IO.Path.GetFileName(s);
                destFile = System.IO.Path.Combine(targetPath, fileName);
                System.IO.File.Copy(s, destFile, true);
            }
        }
        else
        {
            Console.WriteLine("Source path does not exist!");
        }
 
        // Keep console window open in debug mode.
        Console.WriteLine("Press any key to exit.");
        Console.ReadKey();
    }
}

 private void button1_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();
            label1.Text = "Путь: " + folderBrowserDialog1.SelectedPath;
        }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
 
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        string fileName = "file.doc";
        string sourcePath = @"D:\Program Files\";
        string targetPath = @"";
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();
            targetPath = textBox1.Text = folderBrowserDialog1.SelectedPath;
           
        }
 
        private void start_Click(object sender, EventArgs e)
        {
            string sourceFile = Path.Combine(sourcePath, fileName);
            string destFile = Path.Combine(targetPath, fileName);
            System.IO.File.Copy(sourceFile, destFile, true);
 
        }
 
 
        }
    }

string targetPath = @"";

folderBrowserDialog1.SelectedPath;

string targetPath = @""

private void button1_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();
            targetPath = textBox1.Text = folderBrowserDialog1.SelectedPath; //присваиваю выбранный каталог
           
        }