Gridview Textbox looses its content on postback

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C#

ASP.NET

Hi
I am creating the order form I have Gridview where I am fetching three columns from database table namely Id, Name And price , and added fourth column as new template field with TextBox for quantity, and for gridview allow paging is true with 5 rows per page.

After putting quantity in text-boxes When I click on Grid View page index the text box contents gets lost.

I want to put quantity on each Gridview page for all items and then want to add that all selecetd rows to new Gridview With mainly four columns and fifth column for Remove Row link please help me for this.