Implements Microsoft.Office.Core.Range Interface (VB.Net)

[ns2k]

I tried to implements Microsoft.Office.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(Optional ByVal RowIndex As
Object = Nothing, Optional ByVal ColumnIndex As Object = Nothing) As
Object Implements Excel.Range._Default
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.Item
Get
End Get
Set(ByVal newValue As Object)
End Set
End Property

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

What is the reason for that?

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