How do you Sort a DataTable given column and direction?

I need to resort, in memory, a DataTable based on a column and direction that are coming from a GridView. The function needs to look like this:

public static DataTable resort(DataTable dt, string colName, string direction)
{
    DataTable dtOut = null;

    ....
}

I need help filling in this function. I think I can use a Select statement but I am not sure how. I can't click on Comments because of this browser but you can show me an in-place or new DataTable solution, either one. For the people showing me pointers, please, I need a coded function similar to the one prototyped.

How about:

// ds.Tables[0].DefaultView.Sort="au_fname DESC";
   public static void Resort(ref DataTable dt, string colName, string direction)
   {
        string sortExpression = string.Format("{0} {1}", colName, direction);
        dt.DefaultView.Sort = sortExpression;
   }