You're very welcome, Dmitry! =)

~~Bonnie



>Bonnie and Cetin,
>
>Thank you both very much for your help. It does the job!
>
>>Dmitry,
>>
>>You need to use the .Expression Property of the Column:
>>

>>dstMyDataSet.Tables["MyTable"].Columns.Add("MyColumn3");
>>dstMyDataSet.Tables["MyTable"].Columns["MyColumn3"].Expression = "MyColumn1 + MyColumn2";
>>

>>
>>~~Bonnie
>>
>>
>>>I have a dataset with a datatable with 2 columns. I need to add a 3rd column that will be a concatenated of the other two.
>>>
>>>I figured the code of adding the column, as folows (and hopefully it is the right way):
>>>
>>>

>>>dstMyDataSet.Tables["MyTable"].Columns.Add("MyColumn3");
>>>

>>>
>>>But I can't figure out how to make this column, MyColumn3 to be populated as a sum of the other two columns.
>>>
>>>Thank you in advance for any suggestions and help.