title: "a" Does not contain a definition for"b" and no extension method ' b ' accepting a first argument of type
body: <p>I got an error which i cant fix:</p>
  
  <pre><code>Error 1 'System.Windows.Forms.Label' does not contain a definition for 'Copy' 
  and no extension method 'Copy' accepting a first argument of     
  type'System.Windows.Forms.Label' 
  could be found (are you missing a using directive or an assembly reference?)
  //path 156  22 FileWatcherEigen
  </code></pre>
  
  <p>That was my error. Can someone help me and explain to me what went wrong?</p>
  
  <p>This is my code:</p>
  
  <pre><code>using System;
  using System.IO;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Windows.Forms;
  
  namespace WindowsFormsApplication1
  {
  
  public partial class Form1 : Form
  {
      private bool pause = false;
      private bool cut1 = false;
      private bool copy1 = false;
  
      public Form1()
  
      {
          InitializeComponent();
      }
  
  
  
      // The lines with performed actions of a file
    private void fileSystemWatcher1_Created(object sender,System.IO.FileSystemEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Created&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      private void fileSystemWatcher1_Changed(object sender, System.IO.FileSystemEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Changed&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
      private void fileSystemWatcher1_Deleted(object sender, System.IO.FileSystemEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Deleted&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      private void fileSystemWatcher1_Renamed(object sender, System.IO.RenamedEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Renamed&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      private void fileSystemWatcher2_Changed(object sender, System.IO.FileSystemEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Changed&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      private void fileSystemWatcher2_Created(object sender, System.IO.FileSystemEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Created&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      private void fileSystemWatcher2_Deleted(object sender, System.IO.FileSystemEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Deleted&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      private void fileSystemWatcher2_Renamed(object sender, System.IO.RenamedEventArgs e)
      {
          if (!pause)
          {
              listBox1.Items.Add("File Renamed&gt; " + e.FullPath + " -Date:" + DateTime.Now);
          }
      }
  
      //1st directory
      private void button2_Click(object sender, EventArgs e)
      {
          if (dlgOpenDir.ShowDialog() == DialogResult.OK)
          {
              fileSystemWatcher1.EnableRaisingEvents = false;  // Stop watching
              fileSystemWatcher1.IncludeSubdirectories = true;
              fileSystemWatcher1.Path = dlgOpenDir.SelectedPath;
              textBox1.Text = dlgOpenDir.SelectedPath;         // Text of textBox2 = Path of fileSystemWatcher2
              fileSystemWatcher1.EnableRaisingEvents = true;   // Begin watching
          }
      }
      //2nd directory
      private void button3_Click(object sender, EventArgs e)
      {
          if (dlgOpenDir.ShowDialog() == DialogResult.OK)
          {
              fileSystemWatcher2.EnableRaisingEvents = false;  // Stop watching
              fileSystemWatcher2.IncludeSubdirectories = true;
              fileSystemWatcher2.Path = dlgOpenDir.SelectedPath;
              textBox2.Text = dlgOpenDir.SelectedPath;         // Text of textBox2 = Path of fileSystemWatcher2
              fileSystemWatcher2.EnableRaisingEvents = true;   // Begin watching
          }
      }
      //log
      private void button1_Click(object sender, EventArgs e)
      {
  
          DialogResult resDialog = dlgSaveFile.ShowDialog();
          if (resDialog.ToString() == "OK")
          {
              FileInfo fi = new FileInfo(dlgSaveFile.FileName);
              StreamWriter sw = fi.CreateText();
              foreach (string sItem in listBox1.Items)
              {
                  sw.WriteLine(sItem);
              }
              sw.Close();
          }
      }
      //pause watching
      private void pause_button_Click(object sender, EventArgs e)
      {
          if (!pause)
          {
              pause = true;
              pause_button.Text = "Unpause";
          }
          else
          {
              pause = false;
              pause_button.Text = "Pause Watching";
          }
      }
      //clear listbox
      private void clear_button_Click(object sender, EventArgs e)
      {
          listBox1.Items.Clear(); 
      }
  
      private void Transfer_Click(object sender, EventArgs e)
      {
          if (copy1)
          {
              File.Copy(FileBrowseBox.Text, Path.Combine(DestinationBox.Text, Path.ChangeExtension(FileNameBox.Text, Path.GetExtension(FileBrowseBox.Text))));
          }
  
          }
  
      private void Browse_file_Click(object sender, EventArgs e)
      {
          DialogResult resDialog = openFileDialog1.ShowDialog();
          if (resDialog == DialogResult.OK)
          {
              FileBrowseBox.Text = openFileDialog1.FileName;
          }
      }
  
      private void Browse_destination_Click(object sender, EventArgs e)
      {
          DialogResult resDialog = folderBrowserDialog1.ShowDialog();
          if (resDialog == DialogResult.OK)
          {
              DestinationBox.Text = folderBrowserDialog1.SelectedPath;
          }
  
      }
  
      private void CopyButton_CheckedChanged(object sender, EventArgs e)
      {
          copy1 = true;
      }
  
  }
  }
  </code></pre>
  
  <p>It says the problem is within this part:</p>
  
  <pre><code> File.Copy(FileBrowseBox.Text, Path.Combine(DestinationBox.Text, Path.ChangeExtension(FileNameBox.Text, Path.GetExtension(FileBrowseBox.Text))));
  </code></pre>
  
  <p>I have tried to find it on this forum but i couldn't really find the answer or solution</p>
  
  <p>It does work with this code:</p>
  
  <pre><code>using System;
  using System.IO;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Windows.Forms;
  
  namespace WindowsFormsApplication1
  {
  public partial class Form1 : Form
  {
      private bool cut = false;
      private bool copy = false;
      public Form1()
      {
          InitializeComponent();
      }
  
      private void button1_Click(object sender, EventArgs e)
  {
      File.Copy(FileBrowseBox.Text, Path.Combine(DestinationBox.Text, Path.ChangeExtension(FileBox.Text, Path.GetExtension(FileBrowseBox.Text))));
      label2.Text = "File Transfer Succeeded";
  }
  
      private void button2_Click(object sender, EventArgs e)
      {
          DialogResult resDialog = openFileDialog1.ShowDialog();
          if (resDialog == DialogResult.OK)
          {
              FileBrowseBox.Text = openFileDialog1.FileName;
              label2.Text = "";
          }
      }
  
      private void button3_Click(object sender, EventArgs e)
      {
          DialogResult resDialog = folderBrowserDialog1.ShowDialog();
          if (resDialog == DialogResult.OK)
          {
              DestinationBox.Text = folderBrowserDialog1.SelectedPath;
              label2.Text = "";
          }
      }
  
      private void radioButton1_CheckedChanged(object sender, EventArgs e)
      {
          copy = true;
      }
  
      private void radioButton2_CheckedChanged(object sender, EventArgs e)
      {
          cut = true;
      }
  }
  }
  </code></pre>