how to create dropdown box(validation value range from another sheet)

hi, guys, I am using Syncfusion ExcelRW now. I try to create a dropdown list with certain values, those values are defined in cells in one column in another sheet, how can I do that? I know how to make a dropdown list with values from a string array in my program, but seems the same function didn''t allow me to put the cells'' position. Thanks a lot for your help.

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