You can use below code for ADD CONFIRM DELETE DIALOG BOX solution

OnClientClick="return confirm('Are you sure you want to delete this ProductType?');"

chunkbar commented: yup it works i have added this in grid view delete button +0

you can make your own chat application using asp.net

[QUOTE=waqar100;1541030]I want to increase the data type of varchar(100) to varchar(200)?without any loss of data in the existing table?HOW[/QUOTE]

ALTER TABLE table_name
MODIFY COLUMN col_name varchar(200)