次のサンプルコードは、行がフィルタに一致していないかどうかを返します。
fpSpread1.ActiveSheet.Columns[0].AllowAutoFilter = true;
bool b = fpSpread1.ActiveSheet.RowFilter.IsRowFilteredOut(3);
MessageBox.Show("The column has been filtered is " + b.ToString);
FpSpread1.ActiveSheet.Columns(0).AllowAutoFilter = True
Dim b As Boolean = FpSpread1.ActiveSheet.RowFilter.IsRowFilteredOut(3)
MessageBox.Show("The column has been filtered is " & b.ToString)