Windows VB.Net Tutorial

public class Test
   public Shared Sub Main
        Dim objExcel As New Excel.Application
        objExcel.Visible = True
        objExcel.Workbooks.Add()
        objExcel.Range("A1").Select()
        objExcel.ActiveCell.FormulaR1C1 = "75"
        objExcel.Range("B1").Select()
        objExcel.ActiveCell.FormulaR1C1 = "125"
        objExcel.Range("C1").Select()
        objExcel.ActiveCell.FormulaR1C1 = "255"
        objExcel.Range("D1").Select()
        objExcel.ActiveCell.FormulaR1C1 = "295"
        objExcel.Range("A1:D1").Select()
        objExcel.Range("E1").Activate()
        objExcel.ActiveCell.FormulaR1C1 = "=SUM(RC[-4]:RC[-1])"
        objExcel.Range("A1:E1").Select()
        objExcel.Selection.Font.Bold = True
        objExcel = Nothing
   End Sub
End Class