C#: Fix error System.NullReference Exception occurred when insert all rows datagridview to database

C#: Fix error System Null.ReferenceException occurred when insert all rows datagridview to database.
Although Error occurred all Data inserted successfully.
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Tags:
How do I fix NullReferenceException in C#?
What is System NullReferenceException?

How can I save data from DataGridView to database?

How do I catch NullReferenceException?

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[carlosmaffessoni]

Thank you! Simply solution, but only you knew about it!