Save (Insert) ASP.Net GridView rows with form data in database on Button Click using C# and VB.Net

Dear Programer(s)

how can i save my gridview data.

Order id - 12345 Customer Name -abc xyz

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id | Item Name |Item Price   |Tax      |Total amt.

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1 | Saree          |1500.00     |75.00    |1575.00

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2 |Suit              |900.00       |45.00    |945.00

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I want to save this gridview data into my sql table and order id and customer name

will be same for each row. How can i save this data into sql table.

Note - Please do not share any reference link please explain at here step by step.