title: Save excel file using savefiledialog class in C#
body: <p>I need to create and save a Excel file without inform in the code the path and file name. So I can use the savefiledialog to show the save box to input the path and file name, but I can´t use it correctly.
  I tried to use the worksheet.saveas but this class doesn´t show the save box to input the path and file name.
  How can I save a excel file with that save box?</p>