Populate DropDownList Dynamically in ASP.NET (Country-State-District-City)

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How to Make a Complete Dropdown and Prevent Inserting Dummy Data from Form.
Disable other Controls when Clicked back to Parent Control:
Drop Down Sequence:
OnLoad
Load Country
On-Change
Load State according to Country
On-Change
Load Dists in State
On-Change
List Cities in Dist.
Code:

Preview:

John Bhatt
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