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http://192.168.1.10:8090/sendsms?username=user&password=123456789&phone=03001234567&message=hiworld
First of all, you should learn a few things about IP address scheme.
192.168.xxx.xxx is a rank of addresses which are non routable, this mean that this rank can not be accessed from outside of your home/company network. Those addresses can not be accessed from internet.
Thousands of companies/homes have a computer with address 192.168.1.10 in their own network.
So your url is absolutely useless for anyone on this site.
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How to use json in ASP.NET
Your question is so general that a simple Google search will give you useful answers much faster.