Insert data to database using JSON and EXT.Net in ASP.Net

Hi! I want insert data into database using json in Ext.net. Who is can help me?

ID           FirstName             Name                         Birthday

1            Pulodov                Rustam                      22.12.1987

2            Asrori                   Yatim                        06.02.1978

3            Sharifov               Sadriddin                    08.12.1991