combo box query

I am not sure of what you require but I see it as

Add 3 groupboxes to your Form, all with visible = false

Add you combobox with the values you want in them. Either leave a space at the top or use selectedindex -1 on From Load

HI sai,

Can you share some screen shots of your exact requirement. It will help us to solve your issue.

im working on windows application

could you please send me the code.

Are you looking like this:

https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_optgroup

Hi Sai,

Yes you can achieve this using jquery!.. Try jquery