CurPath.Add(FullName);错误 1 当前上下文中不存在名称“CurPath”

问题如上： private void FileView_DoubleClick(object sender, System.EventArgs e)
        {
            try
            {
                string FullName = FileView.SelectedItems[0].Tag.ToString();
                if (FileView.SelectedItems[0].ImageIndex == 1)
                {
                    EditTxt dlgEditTxt = new EditTxt();
                    dlgEditTxt.lbFullName.Text = FullName;
                    dlgEditTxt.ShowDialog(this);
                }
                else
                {
                    if (FileView.SelectedItems[0].ImageIndex == 2)
                        System.Diagnostics.Process.Start(FullName);
                    else
                    {
                        txtCurPath.Text = FullName;
                        FillFilesView(FullName);
                        CurPath.Add(FullName);
                    }
                }
            }
            catch (Exception E)
            {
                MessageBox.Show(E.Message.ToString());
            }
        }