Change LightSwitch default validation message

Hi,
I have two tables 1. State, 2.District
1.State- StateId-Pk, StateName
2.District- DistrictId-Pk, DistrictName, StateId-Fk
Now I have created a AddEditScreen for District. As the two tables are in relationship the AddEditScreen is showing 3 fields 1.DistrictName, 2. StateName, 3.StateId. The StateName field is DetailsPicker. I have removed the StateId field from the
display page. Now when I'm clicking on save button it is giving a error message
"StateId: This field is required.". I don't want to show the StateId field. I only want to show 1.DistrictName, 2. StateName field. Now how to change the default validation message to "State Name: This field
is required."  if anyone doesn't select a state name.
Please help me.
Thanks in advance. 

Hello
The screenshot you have attached is not the screen designer, this is the data designer (for want of a better word for it). The scren designer is where you add the data objects onto the screen. I have attached a screenshot below of what you are looking for.
I know that this is of an older version of Visual Studio but the principal is still the same.
AAs you can see i Have selected the Name field within VeryFullTables and then selected the small arrow next to write code. Then you select the _Validate method. This will allow you to enter some simple code that will show on the validation message.
If you found this post helpful, please mark it as helpful. If by some chance I answered the question, please mark the question as answered. That way you will help more people like me :)

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