specified cast is not valid. asp.net checkbox

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While working on Grid view with Checkboxes and binding dynamic data, I came across an Erroe saying "Specified Cast is Not Valid", it was related to following code

Then after doing search for specified cast is not valid. asp.net checkbox, I made following changes in the same code it worked.

I am not going into More details for specified cast is not valid for asp.net checkbox in this article.