How to access the id of a concatenate column and validate our winform in C#

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hi guys!
i have two problems
first:
i concatenate two column through select query
this is the query
"select concat (Vehicle.Vehicle_Name, '-' , Vehicle.Vehicle_Model) as [Vehicle Name] from Vehicle"
and assign to a text-box1
now i want to access the id of the textbox1.text

Second:
is there any built-in library in c# to validate our winform
thanks

What I have tried:

i tried a lot but didn't find something beautiful

Posted 29-Dec-18 1:40am

Member 13985914

Updated 29-Dec-18 1:55am

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OriginalGriff · Answer 1 · 2018-12-29T01:56:00

1) What ID? Text strings do not have an ID: they are just that: strings. And when you concatenate two strings, you "break the association" with any particular row in the DB. It may be that you can "reunite" the string with the row by undoing the concatenation and SELECTing back from the DB, but it's not guaranteed to work in all cases. In this, it might, but - it's a poor idea.

A better idea is to create a class which contains the row ID, and the two strings - then override ToString to concatenate them. Fill that from your DB, and use a ComboBox instead of a text box to let the user pick the make and model. That way, you can use the selected item to get back the class instance and you have your rowID available.

2) No. Think about it: do you have any idea what validation I might want to do on my forms? So why would the system (or anyone else) have any more idea what validation you want?