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How can we convert a range of cells to numeric format

Apr 27, 2015 at 8:10 AM
Can any one please provide information on how can we change the the cell format to numeric in EPPlus worksheet so that when a user select a range of cells in excel he would get the sum of it in the right bottom corner in excel. My data table gives numbers as string data. So what can I do.
I have used the Numberformat property but it has no effect.