Convert a DataTable Column into String Array

Suppose there is a single column DataTable with user names. In order to convert the data in this column into a string array you can do it in for-loop and LINQ approaches.


For-Loop approach:

int columnIndex = 0; //single-column DataTable
string[] userArr = new string[dt.Rows.Count];
for( int i = 0; i < dt.Rows.Count; i++)
{
    userArr[i] = dt.Rows[i][columnIndex].ToString();
}


LINQ approach 1:

int columnIndex = 0; // single-column DataTable
var userArr = dt.Rows.Cast()
                     .Select(row => row[columnIndex].ToString())
                     .ToArray();


LINQ approach 2:

int columnIndex = 0; // single-column DataTable
List userList = new List();
foreach( DataRow row in dt.Rows )
{
    userList.Add( row[columnIndex].ToString() );
}