GridView RowUpdating无法获取新值

I was just testing if I will get the changed value out of the textbox when updating with no luck. I just cant get the new value. What am I doing wrong? I have tried numerous things. And this is the latest one. How can I get the updated new value to my label? When I click edit on the grid and change the value of the textbox and click update the label will just display the original value of the textbox.I was just testing if I will get the changed va