Excel vba เลือกแผ่นงานอยู่ก่อน

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excel vba รดำรงอยู่ของแฟ้ม

' Existence of a file 
If Dir("C:\myDirectory\myFile", vbDirectory) = vbNullString Then
    MsgBox "Doesn't exists"
Else
    MsgBox "Exists"
End If

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