Thank you Bonnie. That works.

Zakaria al Azhar

>Zakaria,
>
>You simply need to cast the objects to the double data type:
>

>MyTable.Rows[i]["Qx"] = (double)TableLx.Rows[i][1] + 1/(1.04)*(double)TableLx.Rows[i][1];
>

>
>~~Bonnie
>
>
>
>>Hello All,
>>
>>I have DataTable with some columns. The first column is filled with some double values. The other columns are empty, I want to fill those columns by performing some calculations on the content of the first column,like below:
>>

>>MyTable.Rows[i]["Qx"] = TableLx.Rows[i][1] + 1/(1.04)*TableLx.Rows[i][1];
>>

>>
>>This is not possible because the Items are objects and you can't use the '+' operator. How to fill those columns then ?
>>
>>Thank you.
>>
>>Zakaria