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Custom DataValidation

Aug 2, 2016 at 4:16 PM
Hello
I try to used the custom datavalidation

var validate = worksheet.Column(count).AsRange().SetDataValidation();
validate.Custom("###+###");

where "###+###" is string an d # is a number (exemple : (111+222 or 147+258)

Unfortunately, nothing work

Can you help me?