Design or Algorithm to Validate a Pattern of Data in DataTable C#

I have a very weird situation . I have a Excel file with data like

Header data_xyz

A|B|C

datA 1|2|3

datB 1|2|3

datC 1|2|3

.

.

.

.

END of Pattern

Recurring Pattern

Header data_xyz

A|B|C

datA 1|2|3

datB 1|2|3

datC 1|2|3

.

.

.

.

END of Pattern

Now we need to validate the data in columns A,B,C is Numeric and similarly check the datA,datB be not empty .

Rules will be 1)No of data rows in pattern differ 2)Each Pattern is defined so any data other than pattern will be invaid

Can we use some design to achieve the same .

Thanks in advance