Public Interface IWorksheet 
   Inherits IPrintable, ISheet 

public interface IWorksheet : IPrintable, ISheet  

class Program
{
    static void Main()
    {
        // Create a new empty workbook in a new workbook set.
        SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbook();
        // Get a reference to the first worksheet.
        SpreadsheetGear.IWorksheet worksheet = workbook.Worksheets["Sheet1"];
        // Get a reference to the top left cell of Sheet1.
        SpreadsheetGear.IRange a1 = worksheet.Cells["A1"];
        // Set a formula.
        a1.Formula = "=24901.55 / PI()";
        // Output the result of the formula.
        System.Console.WriteLine("The diameter of the earth is " + a1.Value + " miles.");
    }
}

Class Program
   Shared Sub Main()
      ' Create a new empty workbook in a new workbook set.
      Dim workbook As SpreadsheetGear.IWorkbook = SpreadsheetGear.Factory.GetWorkbook()
      ' Get a reference to the first worksheet.
      Dim worksheet As SpreadsheetGear.IWorksheet = workbook.Worksheets("Sheet1")
      ' Get a reference to the top left cell of Sheet1.
      Dim a1 As SpreadsheetGear.IRange = worksheet.Cells("A1")
      ' Set a formula.
      a1.Formula = "=24901.55 / PI()"
      ' Output the result of the formula.
      System.Console.WriteLine(("The diameter of the earth is " + a1.Value + " miles."))
   End Sub 'Main
End Class 'Program