How to get particular cell value of gridview

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ASP.NET

Hello all,

I am working on gridview and i have 1 autogenerated button column.
In that button i have coding for email.
Now i need to extract emailid which is on say column[4] of gridview.
So How can i retrieve value
for ex:
row 1 column 4 ?

Now my problem is that i am getting row count and iterating throught it properly
but when i am using Cells[4].text i am not getting any values instead it is blank
why is it ?
below is my code

foreach (GridViewRow row in GridView1.Rows)
       {
           string val = row.Cells[4].Text;
           Response.Write(val);
       }