'1から始まる整数でシートを選択します。
Dim instance As ExcelSheet
Dim number As Integer

'Overloads
instance.SelectSheet(number)

'シート名でシートを選択します。
Dim instance As ExcelSheet
Dim sheetName As String

'Overloads
instance.SelectSheet(sheetName)

'ExcelSheetクラス SelectSheetメソッド

Public Class AddIn

    Private es As ExcelSheet

    Public Sub New()
        es = New ExcelSheet()
		es.SelectSheet(1)
		es.CellValue(1,1,"あいう")
		es.Save("D:\tmp\sample2.xlsx")
		es.Dispose()
    End Sub

End Class

'ExcelSheetクラス SelectSheetメソッド

Public Class AddIn

    Private es As ExcelSheet

    Public Sub New()
        es = New ExcelSheet()
		es.SelectSheet("Sheet1")
		es.CellValue(1,1,"あいう")
		es.Save("D:\tmp\sample2.xlsx")
		es.Dispose()
    End Sub

End Class