Need someone who knows c# to help with Data Import Pre Proccessing

I do not know c# at all but I need to pre-process a csv file that I am importing

essentially I have data such as

Serial Number         Model            Order Number

2xf434                    t420                     12345

SC02512312          Mac                       12323

Basically what I need it if it finds a row where if the serial number starts with SC  I need to it strip the C and just return C02512312 in the example above and if not just return the rows as they are in the csv to begin with.

Any help is appreciated