Jan 08, 2014 01:13 AM|Terry Guo - MSFT|LINK
According to your description, my understanding is that you would like to fetch datatable columns value into string array.
If so, please try to refer to the following code:
string strArr = new string[dt.Rows.Count];
foreach (DataRow r in dt.Rows)
strArr[i] = r["ColumnName"].ToString();
Hope it helps.