GridView Cell value cannot fetch

Question

Sir,

 

I am in a ASP.NET project. I stuck in code piece to fetch GridView cell value into a variable.  Data being fetched from database in page load(if !PostBack). then all cell value become null when come to the RowCommand event. why that happening?

 

 

Here the code:-

int EmpID = Convert.ToInt32(((GridViewRow)(((LinkButton)e.CommandSource).NamingContainer)).Cells[1].Text);