how to add two datatable column .

Question

1.00/5 (1 vote)

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sir, i have 2 datatable that result show like:-

Datatable1:-

Studentid --  marks
  101      --  6
  102      --  4
  103      --  5

Datatable2:-

Studentid  --- marks
  101       --  6
  102       --  7
  103       --  5

now i need i third datatable that show the addition of this two datatables. and look like :-

Datatable3:-

Studentid  -- Marks
 101       -- 12
 102      --  11
 103     --   10

how can i do it?

Posted 1-Sep-14 2:51am

TCS54321

Updated 1-Sep-14 5:36am

Nelek

v2

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3 solutions

Solution 2

Try this!

C#

int length = 10 //considering 10 rows
for(int i = 0 ;i < length ; i++)
{
    DataRow drow = dt.NewRow();
    for(int k = 0;k < 2;k++) //Considering 2 columns
    {
         if(k % 2 == 0)
         {
              drow[k] = dt1.Rows[i][k].ToString(); // your student id from 1st table
         }
         else
         {
              drow[k] = (Convert.ToInt32(dt1.Rows[i][k]) + Convert.ToInt32(dt2.Rows[i][k])).ToString();   //dt2 your second table
         }
    }  
     dt.Rows.Add(drow);

}

Posted 1-Sep-14 3:20am

ChintanShukla

Comments

TCS54321 1-Sep-14 9:30am

i need the code in vb.net

ChintanShukla 1-Sep-14 9:34am

I gave you the logic. Convert code to VB.net by yourself

Solution 1

Is this what you are looking for : Merging two datatable in memory and grouping them to get sum of columns[^]

Note : Convert the code to vb.net

Regards..

Posted 1-Sep-14 3:02am

Thanks7872

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Gupta Poonam · Accepted Answer · 2014-09-01T03:44:00

You can use LINQ, Its a C# code you can find the corresponding Vb code here

C#

var query =
    from table1 in Datatable1.AsEnumerable()
    join table2 in Datatable2.AsEnumerable()
    on Datatable1.Field <int>("Studentid") equals
    Datatable2.Field <int>("Studentid")
    select new
    {
        Studentid=
            Datatable1.Field <int>("Studentid"),
        Marks =
            Datatable1.Field <int>("marks") + Datatable2.Field <int> ("marks")
    };