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You can do negative checks first and return as suggested by Johan. This will results in much readable and less number of lines in code

You can do negative checks first and return as suggested by Johan. This will results in much readable and less number of lines in code

You don't need these variables to be declared outside score.

You don't need these variables to be declared.

• Make use of foreach instead of for whenever possible
• Use of switch instead of if-else ladder
• Use variables to store and re-use. I have used currentRow for sheet.GetRow(i)

• Make use of foreach instead of for whenever possible
• Use switch instead of if-else ladder
• Use variables to store and re-use. I have used currentRow for sheet.GetRow(i)