从gridview传递数据时，对象引用未设置为对象的实例

I am passing values from a gridview to next page.The gridview is connected to a database.The gridview shows the data as i want but when i try to pass the row data of gridview to next page it throws an error ' Object reference not set to an instance of an object' The gridview is as follows:I am passing values from a gridview to next pag