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because blank is not equal to '-None-' The blank is a value, and 'None' is a text. Also, you might not want to do that.

even they are showing the none value

Then there must be a space or something that is missing in your comparison. Try copying that None from the Log and use trim in the comparision. Something like: if(srno.trim() != '- None -') should resolve your problem.

thnx its work