Create an array from a column of data in a table

protected void Page_Load(object sender, System.EventArgs e)
{
 Data.DataTable DataTable1 = new Data.DataTable();
 DataTable1.ReadXml("C:\\Data.xml");
 string[] ColumnValues = DataTableColumnValuesToStringArray(DataTable1, "ColumnName");
}

public string[] DataTableColumnValuesToStringArray(Data.DataTable PassedDataTable, string PassedColumnName)
{
 string[] functionReturnValue = null;
 if ((PassedDataTable.Columns.Contains(PassedColumnName) == false) | (PassedDataTable.Rows.Count < 1)) {
  return null;
  return functionReturnValue;
 }
 string[] ReturnValues = new string[PassedDataTable.Rows.Count];
 for (int i = 0; i <= PassedDataTable.Rows.Count - 1; i++) {
  ReturnValues(i) = Convert.ToString(PassedDataTable.Rows(i).Item(PassedColumnName));
 }
 return ReturnValues;
 return functionReturnValue;
}