Taking gridview control outside it

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C#

ASP.NET

Hi,
I want to update a gridview row. While editing I want to change the data of a textbox inside the GridView. This value should be selected by a number picker outside the gridview. I created the number picker using buttons. So while clicking on the edit button, the number picker will be shown. Then we select the numbers. The textbox value should be changed while selecting each button. For that I want to take the textbox value outside the gridview. Is their any methods to take the textbox outside gridview?
Thank you...