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I want to validate the given address (address, city, state, zip) to the USPS and return back the result if the provided address is a valid address. and if it is not the valid address returns the invalid address.
so how can i do this in C#.Net.
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Thankfully you can verify your customers' addresses with the USPS address validation service which matches your address with the United States Postal Service database to ensure your mail goes to the correct address.
The first is to use a USPS® address verification tool. These tools can verify both US-based addresses as well as international addresses in batches. The second method is to use an address validation API. This technical tool connects to your website, application, or other technology to validate addresses in real time.
Inside the packet is PS Form 3575. Fill out this change of address form and give it to a postal worker behind the counter. Or, drop it into the letter mail slot inside the post office. You should receive a confirmation letter at your new address in five business days.
Sometimes, an address will not validate because the address is marked as "vacant" by the USPS. Additionally, a new address, an unregistered address, or one located within a postal code primarily serviced by PO boxes, would all fail to validate.
The United States Postal Service (USPS) does offer this service via their Address Information APIs:
Here's a Code Project article/library how you could use this services in .NET:
Note
Before you can use this library, you will need to get a USPS Web Tools ID by filling out this form.
To request the Address Informational APIs (Verify etc.) you need additional permissions. Also fill out this form to apply for these permissions.
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