This property is available at run time only.
bool b; fpSpread1.ActiveSheet.AddSelection(0, 0, 3, 3); b = fpSpread1.ActiveSheet.IsBlockSelected; label1.Text = "IsBlockSelected for the sheet = " + b.ToString();
Dim b As Boolean FpSpread1.ActiveSheet.AddSelection(0, 0, 3, 3) b = FpSpread1.ActiveSheet.IsBlockSelected Label1.Text = "IsBlockSelected for the sheet = " & b.ToString()