how to edit Gridview morethan 20 values in column?

Question

suppose i have a database there are lot of fields like

Tbl_Customer_detail

cus_id, cusFirstName, cus_LastName, cusMob1, cusMob2 Cus_pic, Cus_dob, cus_fathername, cusAddress, cus_relation, cus_visitno, cus_email, cus_city, cus_ status etc etc now i show only few data in gridview like cusName, cusMob1, cus_email and status and when i click edit button open editing only in these field i need update all fields.

for this i want that open a new windows and show all field vales than update.

i am new to dotnet c# developer