use of datakey in template field of gridview having label in it

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C#

can we use datakey for template field in gridview

i found one which is use with databound field in gridview..

what is the alternate of that if we are using template field have a label in it to display data..

here is the datakey feature used in databound field

item.ProductID = (int)GridView1.DataKeys[i].Value;