Implements Microsoft.Offic e.Core.Range Interface (VB.Net)

[ns2k]

I tried to implements Microsoft.Offic e.Core.Range Interface, but the
dot net raise errors :
+ ' '_Default' cannot implement '_Default' because there is no
matching property on interface 'Range'.'
+ ' 'Item' cannot implement 'Item' because there is no matching
property on interface 'Range'.'
+ ' 'Value' cannot implement 'Value' because there is no matching
property on interface 'Range'.'

see my declarations in the class below :

Public Class RangeClass
Implements Excel.Range
............... ..

all kind of properties and functions that were inserted automatic by
the dot net

............... ..

Public Overridable Property _Default(Option al ByVal RowIndex As
Object = Nothing, Optional ByVal ColumnIndex As Object = Nothing) As
Object Implements Excel.Range._De fault
Get
End Get
Set(ByVal newValue As Object)
End Set
End Property

Public Property Item(ByVal RowIndex As Object, Optional ByVal
ColumnIndex As Object = Nothing) As Object Implements
Excel.Range.Ite m
Get
End Get
Set(ByVal newValue As Object)
End Set
End Property

Public Property Value(Optional ByVal RangeValueDataT ype As Object =
Nothing) As Object Implements Excel.Range.Val ue
Get
End Get
Set(ByVal newValue As Object)
End Set
End Property
End Class

What is the reason for that?

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