static DataTable ConvertListToDataTable(List<WindowsFormsApplication1.ServiceReference1.ArrayOfString> list)
    {
        // New table.
        DataTable table = new DataTable();

        // Get max columns.
        int columns = list[0].Count();

        // Add columns.
        for (int i = 0; i < columns; i++)
        {
            table.Columns.Add();
        }

        // Add rows.
        foreach (var array in list)
        {
            table.Rows.Add(array);
        }

        return table;
    }

List <WindowsFormsApplication1.ServiceReference1.ArrayOfString> list = cont.GetAllEmployee();

                    DataTable table = ConvertListToDataTable(list);
                    dataGridView.DataSource = cont.GetAllEmployee();