It's saying that the control source is not a valid source. For example, the control source could be State
when the actual data source is called State1
. Although it is hard to understand what you are trying to say here:
my Field Name in my design View a same as the One in my Control Source property text-box
If you mean the source is called State
and the actual name of the textbox is also State
, there's your problem. Rename the textbox something like txtState
and the problem will be solved (in access especially, I always ensure I use Hungarian Notation).