Parsing from string to datetime error.

Hi,
I have tried several time to adopt msdn's parsing strings to datetime formats but they are to no avail. I am trying to extract data from sql database with a specific period with the help of the tableadapter which has this call code: select * from members where date<=@fromdate And date>=@todate Order by date.
The error i get is "String was not recognized as a valid DateTime" even if i use tryparseexact, tryparse, parseexact, cdate. The code is able to point to the date on the form but sees it as string. What could possibly be the problem?

Code:

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Public Overridable Overloads Function Fill(ByVal dataTable As cmsTitheDurationDataSet4.TitheDataTable, ByVal FromDate As String, ByVal ToDate As String) As Integer
            Me.Adapter.SelectCommand = Me.CommandCollection(0)
            If (FromDate Is Nothing) Then
                Me.Adapter.SelectCommand.Parameters(0).Value = Global.System.DBNull.Value
            Else
                Me.Adapter.SelectCommand.Parameters(0).Value = Date.ParseExact(FromDate, {"dd-MM-yyyy"}, Globalization.DateTimeFormatInfo.InvariantInfo, Globalization.DateTimeStyles.None)
            End If
            If (ToDate Is Nothing) Then
                Me.Adapter.SelectCommand.Parameters(1).Value = Global.System.DBNull.Value
            Else
                Me.Adapter.SelectCommand.Parameters(1).Value = Date.ParseExact(ToDate, {"dd-MM-yyyy"}, Globalization.DateTimeFormatInfo.InvariantInfo, Globalization.DateTimeStyles.None)
            End If
            If (Me.ClearBeforeFill = True) Then
                dataTable.Clear()
            End If
            Dim returnValue As Integer = Me.Adapter.Fill(dataTable)
            Return returnValue
        End Function

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