Html checkbox is selected when click on text of checkbox

Select Checkbox when user click only on Checkbox button

C#
VB.NET
SQL Server

Description :  There is no for properties of label of above example

Eg: < input type='checkbox' id='chkbox1' > < label > Apple < /label >

Select Checkbox when user click on label text and checkbox button

Apple

Mango

Orange

Description : Add for properties of lable and assing input id to for properties.
Eg: <  input type='checkbox' id='chkbox1' > <  label for='chkbox1' > Apple < /label >

Drop down list box with Group(HTML CONTROL)

item 1 item 2 item 1 item 2

Description:
Eg.  Syntax of  select box is
<select id="sexp1" >
<optgroup label='Group 1' >
<option value="1">item 1</option>
<option value="1">item 2</option>
</optgroup>
<optgroup label='Group 2' >
<option value="1">item 1</option>
<option value="1">item 2</option>
</optgroup>
</select>