How to add a column to a dataset dynamically

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With the following code I wanted to add a column dynamically but I get this error at line
'ds21.Columns.Add(theCol);'

Error 13 'System.Data.DataSet' does not contain a definition for 'Columns' and no extension method 'Columns' accepting a first argument of type 'System.Data.DataSet' could be found (are you missing a using directive or an assembly reference?)

My code:

DataSet ds21 = new DataSet("productname");
DataColumn theCol = new DataColumn("Groups", typeof(string));
ds21.Columns.Add(theCol);
da2.Fill(ds21, "productname");

How to rectify this.

Posted 28-Jan-14 16:22pm

S.Rajendran from Coimbatore

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PIEBALDconsult · Answer 1 · 2014-01-28T17:01:00

Solution 1

DataSets don't have Columns; DataTables do.

Additionally, I don't think that will work even if you try to do it with a DataTable. You might consider adding the column to the query you are using to get the data.

Posted 28-Jan-14 17:01pm

PIEBALDconsult

Garth J Lancaster · Answer 2 · 2014-01-28T17:08:00

Isnt a DataSet a collection of DataTables ?

I know you can do this :-

C#

DataTable dt21 = new DataTable("productname");
DataColumn theCol = new DataColumn("Groups", typeof(string));
dt21.Columns.Add(theCol);
da2.Fill(dt21, "productname");

and then you'd likely do this :-

C#

DataSet set = new DataSet("productmaster");
	set.Tables.Add(dt21);

for example

....

'g'

Karthik_Mahalingam · Answer 3 · 2014-01-28T18:34:00

Solution 3

Try this..

C#

DataTable ds21 = new DataTable("productname");
    da2.Fill(ds21);
    DataColumn theCol = new DataColumn("Groups", typeof(string));
    ds21.Columns.Add(theCol);

Posted 28-Jan-14 18:34pm

Karthik_Mahalingam