validate datagridview c#

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I have a datagridview which have predefined columns. I want to validate the columns.certain columns needed to be validated in different format. My column names are unit_id,batch_id,exp_month,exp_year,tax_rate. The validations needed are all columns should not be null,exp_month and exp_date length should be 2 and 4 respectively and they must be not before the current date. The tax rate should be also in 2 digit. And moreover the last row which automatically added should not be considered for null values.

Answer 1

what is the data source? alot of this can be enforced on the database side of things.
https://www.w3schools.com/sql/sql_notnull.asp

Answer 2

what is the database type?

Answer 3

Data source is loaded from the database.

Answer 4

Use cell end edit and validate each colums there