Export to .txt Gridview without using StringBuilder?

Question

I have gridview with 3 columns.

 

I generated 1 column with the help of RowDataBound event of Gridview, I want to export .txt file of that Gridview. The text file is also generated but in that Textfile following data is shown:

 

<div>
<table cellspacing="0"........

..

..

..

</table></div>

 

so how to export .txt in Gridview ?