Asp.net gridview，在编辑模式下获取代码中的boundfield值

In asp.net (c#) I'm using a gridview and edit mode to make it easy for the user to change values. But I need to check the value that the user enter in OnRowUpdating, when using this code, I always get the old value not the new value I entered. How can I get the new value?In asp.net (c#) I'm using a gridview and edit m