Add a form to your project called ListProviderConfDialog (this form is not part of the project template), which needs to have the following control elements.

• txt_ListFile: text field for entering the list file name and path.
• combo_Delimiter: combo list for selecting the delimiter character. Enter the following items: ; : = \t.
• btn_Browse: button for opening selecting the list text file.
• dlg_OpenFile: dialog for selecting the list file. The FileName property should be empty, the Filter property should be List text files (*.txt)|(*.txt)
• btn_Cancel: button for closing the form without applying new or changed settings.
• btn_OK: button for closing the form and applying new or changed settings.

Take the following steps to implement some of the basic user interface functions:

• Selecting the delimited text file: The btn_Browse button should raise the Open File dialog for selecting the delimited text file, and enter the file name into txt_ListFile:
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  private void btn_Browse_Click(object sender, EventArgs e)
  {
      this.dlg_OpenFile.ShowDialog();
      string fileName = dlg_OpenFile.FileName;
  
      if (fileName != "")
      {
          txt_ListFile.Text = fileName;
      }
  }

• Applying the settings: The btn_OK button should close the form and apply the plug-in settings, i.e. the name and path of the text file and the delimiter character.
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  private void bnt_OK_Click(object sender, EventArgs e)
  {
      Options.Delimiter = this.combo_delimiter.Text;
      Options.ListFileName = this.txt_ListFile.Text;
  }

Note
Of course, the form should also configure the plug-in settings, however, for this we need to implement a distinct ListTranslationOptions class, which we will implement in one of the following chapters (see Storing and Retrieving the Plug-in Settings).

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