Entity Framework - Validations

Question

Dear Team,

 

I need help in validations in Entity Framework with Swagger.

 

 

For Example - If I do not put any values for inputs - Locationcode, drivercode, isactive and isapproved, then it should return all the records. But, here , it takes LocationCode input as "string"  and searches the data where locationcode is "string". How do I overcome this ?

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For Saving data, I need to make all the inputs compulsory.

 

 

Here, how do I make all the inputs compulsory ? and give user-friendly messages that - LocationCode is compulsory?

 

Please guide on this ..