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C# et les propriétés

With VBScript and VB6, I can have arguments with the Property Get statement, like that :

Private Property Get OneData(ByVal sOneKey As String) As String
If (sOneKey = "dummy") Then
   OneData = "qwerty"
Else
   OneData = colDatas.item(sOneKey)
End If
End Property

Private Property Let OneData(ByVal sOneKey As String, ByVal sOneValue As String)
If (sOneKey <> "dummy") Then
   colDatas.Add sOneKey, sOneValue
End If
End Property

With VB.NET, I can write that :

Public Property OneData(ByVal sOneKey As String) As String
Get
  If (sOneKey = "dummy") Then
    OneData = "qwerty"
  Else
    OneData = colDatas.Item(sOneKey)
  End If
End Get
Set(ByVal Value As String)
  If (sOneKey <> "dummy") Then
    colDatas.Add(sOneKey, Value)
  End If
End Set
End Property

But with c#, I don't know how to do that, since VS.NET doesn't accept this code :

public string OneData (string sOneKey) {
  get {
    if (sOneKey != "dummy") {
      return _OneData.Values(sOneKey);
    } else  {
      return "qwerty";
    }
  }
  set {
    if (sOneKey != "dummy")
      _OneData.Add(sOneKey, value);
  }
}

Some hints ?