I have the next problem, when I change my data with my form. I always get the error message: “Object reference not set to an instance of an object”
Can you help me?
I thinks I did not make the correct key. But the value is in the same column… so I don’t understand.
When I change the value of this column →
And the technicals of that column are one for update and change →
Can you guys please help me!