DialogResult dlg;
bool b;
dlg = MessageBox.Show("Do you want to hide the first column?", "Get/SetColumnVisible", MessageBoxButtons.YesNo);
if (dlg == DialogResult.Yes)
{
fpSpread1.ActiveSheet.SetColumnVisible(0, false);
b = fpSpread1.ActiveSheet.GetColumnVisible(0);
label1.Text = "Get/SetColumnVisible for column 0 = " + b.ToString();
}