How to convert dataview to data table in .NET

 private DataTable getsortedtable(DataTable dt)
 {
    dataview v=dt.defaultview;
    v.sort="columnName DESC";
    dt=v.toTable();
    return dt;
  }

private DataTable getsortedtable(DataTable dt)
{
    //do the operation for sort   
    return dataView.ToTable();
}

or 

        DataView dv = new DataView(dt);
        dv.Sort = sortExpression + direction;
        tempTable = dv.Table.Clone();
        foreach (DataRowView drv in dv)
        {
            tempTable.ImportRow(drv.Row);
        }
        tempTable.AcceptChanges();
        dgrViewEmp.DataSource = dv;
        dgrViewEmp.DataBind();