What is the use of Column property in Add Data column activity

What is the use of Column property in Add Data column activity.
Can anyone please help me on this.

To put a system.data.datacolumn

For example, I want to delete all column contains “Date”.

For each column in mydatatable
if column.columnName.contain"Date"
deleterow
else

but you dont need to use that, it is optional if you use column name it will be ok.