c# - How to fix "'ServerVersion' threw an exception of type 'System.InvalidOperationException'"? -

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i have got local sql server db, , running, , trying connect in seemingly failproof way: 

new sqlconnection(@"server=(localdb)\v12.0;integrated security=true;database=mydbname;");

however, line throws exception: "'serverversion' threw exception of type 'system.invalidoperationexception'"? fix it?

i have run

sqllocaldb create "v12.0"

but seems make no difference.

enter image description here

enter image description here

try take @ how opening connection. have tried this: c# console application invalid operation exception


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