C#

// First. All table items get thrown inhere for easier breaking up of their data                                                                                  // Line number:    // Product:     Price:     Start-date:     End-date:     Where:     Note:     Tipped-by:
      private List<aTableRow> allTableRows = new List<aTableRow>();

      // Second. Used to store the data for only a single table row at a time
      private List<string> singleTableRowValues = new List<string>();

      // Third. Final list with all the sorted strings of all table rows
      private List<string> finalList = new List<string>();

public void SetTableContent()
{
    StringBuilder builder = new StringBuilder();

    // Take all objects from the list allTableRows individually and place all the items values in its own list, making it possible to string all the single items datavalues together with a stringbuilder.
    foreach (var tableRow in allTableRows)
    {
        singleTableRowValues.Add(tableRow.Product.ToString());
        singleTableRowValues.Add(tableRow.Price.ToString());
        singleTableRowValues.Add(tableRow.StartDate.ToString());
        singleTableRowValues.Add(tableRow.EndDate.ToString());
        singleTableRowValues.Add(tableRow.Where.ToString());
        singleTableRowValues.Add(tableRow.Note.ToString());
        singleTableRowValues.Add(tableRow.TippedBy.ToString());

        builder.Append(singleTableRowValues).Append(" - ");

        tableContent = builder.ToString();

        finalList.Add(tableContent);

        // Cleans up the converter list and table content so they are ready to convert next item.
        singleTableRowValues.Clear();
        tableContent = "";
    }

    foreach (var preparedItem in finalList)
    {
        builder.Append(singleTableRowValues).Append(" - ");

        allTableContent = builder.ToString();
    }
}

int TotalQuantity = 0;
   DateTime dt = new DateTime();
   TimeSpan ts();
   //double totaltime = 00.00;

   protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
   {
       if (e.Row.RowType == DataControlRowType.DataRow)
       {
           TotalQuantity += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Quantity"));
          // totaltime += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Time"));


       }
       else if (e.Row.RowType == DataControlRowType.Footer)
       {
           e.Row.Cells[0].Text = "TotalQuantity";
           e.Row.Cells[0].Font.Bold = true;

           e.Row.Cells[1].Text = TotalQuantity.ToString();
           e.Row.Cells[1].Font.Bold = true;

           e.Row.Cells[2].Text = "TotalTime";
           e.Row.Cells[2].Font.Bold = true;

           e.Row.Cells[3].Text = dt.ToShortTimeString();
           e.Row.Cells[3].Font.Bold = true;
       }
   }