Change the Value of Parent Dropdown using Jquery and the child will show the data

It is not what I'm looking for

Please refer below articles

1. AJAX Cascading DropDownList using jQuery in ASP.Net
2. Implement Cascading Autocomplete TextBoxes from database using jQuery in ASP.Net

Let me clarrify my question.

What I am asking is, if the parent dropdownlist is selected through jquery the child dropdown will load the data.

For more information, kindly look at the picture

I change the value of Country using jquery but the the State Dropdownlist Options did not show the data.

How can I show the data of child dropdown when parent dropdown change.

Thanks

Please share your complete code