Retrieving Excel Data and Binding to a ComboBox in C#

Question

http://www.c-sharpcorner.com/blogs/7482/retrieving-excel-data-and-binding-to-a-combobox-in-c-sharp.aspx


Iam using the code of above post:


But it gives following error:


1) external table is not in the expected format




I have excel sheet having employee id month and year columns.These three columns i should attached comboboxes.


Please give a solution




Thank you,
SRILATHA