Public Sub SetColumnVisible( _
   ByVal column As Integer, _
   ByVal visible As Boolean _
) 

Dim instance As SheetView
Dim column As Integer
Dim visible As Boolean
 
instance.SetColumnVisible(column, visible)

public void SetColumnVisible( 
   int column,
   bool visible
)

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();
}

Dim dlg As DialogResult
Dim b As Boolean
dlg = MessageBox.Show("Do you want to hide the first column?", "Get/SetColumnVisible", MessageBoxButtons.YesNo)
If dlg = DialogResult.Yes Then
    FpSpread1.ActiveSheet.SetColumnVisible(0, False)
    b = FpSpread1.ActiveSheet.GetColumnVisible(0)
    Label1.Text = "Get/SetColumnVisible for column 0 = " & b.ToString()
End If