how can i read multiple connection string from datagridview

Question

how can i read multiple connection string from datagridview like see below details..
i want that if source column and userid and password is ok then update data...


for example:

soruce column,       userid column,      password column
192.168.1.2             abcd                       1234
192.168.1.3             abcde                      2389  
192.168.1.4            abcdef                      45612