After export data table to excel in C#, some cells' data messed up in excel

Question

I am able to export the datatable to excel in C#, however, some of the cells filled up with string "##########################" instead of the corrected cell value. Anyone know why it happens and how to solve the problem?

Answer 1

i think those are datetime columns. you need to expand the column width to see the actual datetime value.

Check the following pictures:

before expanding the DateTime column width(it shows #########)

after expanding the DateTime column width(it shows actual datetime value)