Validate Check box before printing

Question

I have 3 checkboxes that at least one needs to be checked before printing. I have the check boxes linked to the Print button. when i click print a message box states to check one box. when i check the box nothing happens.

 

<div>private void btnPrint_Click(object sender, EventArgs e)

{

try

{

if (!checkBox1.Checked && !checkBox2.Checked && !checkBox3.Checked)

{

MessageBox.Show("Please select one !");

}

}

catch (Exception ex)

{

printDocument1.PrintPage += printDocument1_PrintPage;

printDocument1.Print();

}

}

private void printDocument1_PrintPage_1(object sender, PrintPageEventArgs e)

{

try

{

e.PageSettings.Landscape = true;

Bitmap bm = new Bitmap(this.panel.Width, this.panel.Height);

panel.DrawToBitmap(bm, new Rectangle(0, 0, this.panel.Width, this.panel.Height));

e.Graphics.DrawImage(bm, 0, 0, bm.Width, bm.Height);

}

catch (Exception ex)

{

string s1 = ex.Message;

}

}

}

}<div>