How to merge two datatables in c#?

Question

3.67/5 (2 votes)

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I am trying to merge two data table dt and dt4. While using the given below code getting one error. The error is : "'column' argument cannot be null." Help me to find a proper soluion. Thank you.

Code:

C#

protected void ddlCircle_SelectedIndexChanged(object sender, EventArgs e)
{
    ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter cd;
    cd = new ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter();
    DataTable dt = new DataTable();
    dt = cd.GetAvailableData(ddlCircle.SelectedValue); // Getting details of unassigned site

    int x, y;

    DataTable dt3 = new DataTable();
    dt3 = cd.GetTeam();
    y = dt3.Rows.Count;

    x = dt.Rows.Count; // counting the unassinged sites

    DataTable dt2 = new DataTable();
    dt2 = cd.GetAssignTeam(x);           //Getting team based on count

    string[] arr = new string[dt2.Rows.Count];
    int i = 0;
    foreach (DataRow r in dt2.Rows)
    {
        arr[i] = r["Team"].ToString(); // assigning available team to array
        i++;
    }

    string[] strArr = new string[x+1]; // another array to copy arr values.

    i = 0; int j = 0;
    while (j <= x)
    {
        strArr[j]=  arr[i] ; // copying the arr[] values into strArr[] based on count.
        i++;
        j++;

        if (i == y)
        {
            i = 0;
        }
    }
     DataTable dt4 = new DataTable();
     dt4.Columns.Add("Team");

     foreach (string s in strArr)
       {
          dt4.Rows.Add(s); // Converting string array strArr[] to data table dt4
        }

     dt.Merge(dt4);  // error poppup here. Error : 'column' argument cannot be null.
     GridView2.DataSource = dt;
     GridView2.DataBind();
}

dt contain

C#

State  District  SiteID  SiteName
-----  --------  ------  --------
Sate1  District1  1001     A
Sate2  District2  1002     B
Sate3  District3  1003     C

dt4 contain

C#

Team
-----
Team1
Team2
Team3

I need a final output as:

C#

State  District  SiteID  SiteName  Team
-----  --------  ------  --------  -----
Sate1  District1  1001     A       Team1
Sate2  District2  1002     B       Team2
Sate3  District3  1003     C       Team3

Posted 29-Oct-14 1:00am

Member 11042100

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Comments

V5709 29-Oct-14 7:54am

you can use concepts like inner join to fetch details which will reduce your code

3 solutions

Solution 2

SQL

select a.*,b.team from table_name1 as a,table_name2 as b

Posted 29-Oct-14 1:18am

AGM KUMARAN

Comments

aarif moh shaikh 29-Oct-14 8:31am

He asking about Data Table .. not Database Tables

Solution 3

you can't use Merge for this Case better you could use Join in Datatable

Refer this:

http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_28284094.html[^]

Posted 29-Oct-14 1:35am

King Fisher

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kedar001 · Accepted Answer · 2014-10-29T01:46:00

try like this

C#

string[] strArr = { "a", "b", "c" };
            DataTable dt = new DataTable();
            dt.Columns.Add("ID");
            dt.Columns.Add("NAME");

            dt.Rows.Add("1", "NAME1");
            dt.Rows.Add("2", "NAME2");
            dt.Rows.Add("3", "NAME3");
            dt.Columns.Add("Team");
            int iCount = 0;
            
            foreach (DataRow item in dt.Rows)
            {
                item["Team"] = strArr[iCount];
                iCount++;
            }

            dt.AcceptChanges();