c# - Why cannot an implicitly typed variable be declared at class level? -

this question has answer here:

• why class fields cannot var? [duplicate] 5 answers

so code below valid , outputs 5 excpected , type of foo inferred system.int32.

class program {     static void main()     {         var foo = 5;        console.writeline(foo);     } } 

but if write this

class program {     static var foo = 5;      static void main()     {         console.writeline(foo);     } } 

you following error:

the contextual keyword 'var' may appear within local variable declaration.

what problem of declaring variable using var-keyword @ class level? don't quite understand this, can make clear?

well 1 reason var cannot accessed outside scope had declared , , static persists , can accessed globally(here can see conflicts of intrests) , there goes answer can not declare var static.
implicitly typed local variables