C#

object oFileName = @"C:\TestFindReplace\TestDoc.doc";
object oNewFileName = @"C:\TestFindReplace\" + fullName + ".doc";
object oFalse = false;
object oMissing = Type.Missing;
object oReplaceAll = Word.WdReplace.wdReplaceAll;

Word.Application WordApp = New Word.ApplicationClass();
Word.Document myDoc = WordApp.Documents.Open(ref oFileName,
    ref oMissing, ref oFalse, ref oMissing, ref oMissing,
    ref oMissing, ref oMissing, ref oMissing, ref oMissing,
    ref oMissing, ref oMissing, ref oFalse);
try
{
    Word.Find fnd = WordApp.Selection.Find;
    fnd.Text = ":FULLNAME:";
    fnd.Replacement.Text = fullName; 
    fnd.Execute(ref oMissing,
        ref oMissing, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing, ref oMissing,
        ref oReplaceAll, ref oMissing, ref oMissing,
        ref oMissing, ref oMissing);

[DllImport("user32.dll")]
private static extern ushort RegisterClass(ref WNDCLASS lpwcx);
 
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
private struct WNDCLASS
{
  public UIntPtr style;
  public WndProc lpfnWndProc;
  public IntPtr cbClsExtra;
  public IntPtr cbWndExtra;
  public IntPtr hInstance;
  public IntPtr hIcon;
  public IntPtr hCursor;
  public IntPtr hbrBackground;
  public string lpszMenuName;
  public string lpszClassName;
}
 
private delegate IntPtr WndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

myRow["curr"].Value = false;

private void cmdCopy_Click(object sender, System.EventArgs e)
{
	if(!Directory.Exists(txtDist.Text))
	{
		MessageBox.Show("Please enter a valid path");
		return;
	}
	DirectoryInfo dir=new DirectoryInfo(txtSrc.Text);
	CopyDirectory(txtSrc.Text,txtDist.Text+"\\"+dir.Name);
	MessageBox.Show("OK");
}

private void CopyDirectory(string src,string dist)
{
    if(!Directory.Exists(dist))
		Directory.CreateDirectory(dist);

    FileInfo file;
	DirectoryInfo dir;
	string[] strFiles;
	string[] strDirs;

	//Copy all files...
	strFiles=Directory.GetFiles(src);
	foreach (string strFile in strFiles)
	{
		file=new FileInfo(strFile);
		file.CopyTo(dist+"\\"+file.Name);
	}
    
	//Copy child directories...
	strDirs=Directory.GetDirectories(src);
	foreach (string strDir in strDirs)
	{
		dir=new DirectoryInfo(strDir);
		if(dir.FullName==dist)//check to prevent infinite loop if the distination is under the source folder..
			continue;
		CopyDirectory(dir.FullName,dist+"\\"+dir.Name);
	}
}