.net - SpreadSheetGear - read unique values from Excel column -


i want read column in excel worksheet using spreadsheetgear (.net) , unique values in column back.

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example: above excel worksheet, need read column b , unique values "john" "mike" , "wayne"

in real life, there can 1,000,000+ rows efficiency important. how achieved?

i understand post quite old helpful others: comment entered @michael moreno helpful , endorse idea. concern is: how 1 can judge number of rows or columns iterate loop. suggest property iworksheet.usedrange range of data contained sheet. curtsy by: @chris in thread


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