How to print html div or table from user control in asp.net

Dear Experts,

I'm facing a problem with ASPX user control,

I have design a html in user control

I wish to print their html design (html div or table), have added JavaScript as below, but this JavaScript not working in user control

----------------------

then i have modify this code as below

In code behind

protected void btnPrint_Click(object sender, EventArgs e)
{
btnPrint.Attributes.Add("onclick", "PrintDiv();");
}

Still not working

Please help us.