Question

I have 3 collection datatable that shows in this below

Month: January
ID     NAME       Absent
001    John       3
002    Travis     0

Month: February
ID     NAME       Absent
001    John       18
002    Travis     14

Month: March
ID     NAME       Absent
001    John       10
002    Travis     5

Before, I have used to merge DataTable

dataTable.merge(dataTable2);

The result is like this:

ID     NAME       Absent
001    John       3
002    Travis     0
001    John       18
002    Travis     14
001    John       10
002    Travis     5

dataTable.Merge(dataTableTemp);
GridView.DataSource = dataTable;
GridView.DataBind();

But, I want to create like this (we say: custom GridView):

               Jan      Feb     Mar    Apr
ID    NAME     Absent   Absent  Absent Absent
001   John     3        18      10
002   Travis   0        14      5

How to add/merge every month in the right side of table before, so if I add next month it will appear in the right side of table before..

How to create this:??? Is there any method of function or tools that I can use??

Thanks for any help..

Answer 1

Try this:

        void Merge(DataTable masterDataTable, DataTable[] dataTables, int columnIndex)
        {
            foreach (DataTable dt in dataTables)
            {
                DataColumn newColumn = masterDataTable.Columns.Add(dt.TableName, typeof(int));
                int newColumnIndex = masterDataTable.Columns.IndexOf(newColumn);
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    masterDataTable.Rows[i][newColumnIndex] = dt.Rows[i][columnIndex];
                }
            }
        }

and this is how you use it:

       Merge( janDataTable, new DataTable[]{ febDataTable, marDataTable, aprDataTable}, 2);