Setting MaxLength in Add Data Column Activity

I am taking values from internet and storing them into a data table. Now I would like to put those stored values into a CSV file. But I don’t want the whole value to be stored. I just need the First 2 values for which I am using the MaxLength field of Add Data Column Activity. But unfortunately its not working. It still stores the whole text into the CSV file. Can anyone please help me out with this?

@vivek_Chowdary use for each row activity and pass extracted data table into this.Than you can get row(0).ToString and row(1).ToString this will give first two whole column values