EF Core benchmarks for connections w/ passwords (#1700)

benchmarks/Dapper.Tests.Performance/Benchmarks.EntityFrameworkCore.cs

@@ -19,7 +19,7 @@ public class EFCoreBenchmarks : BenchmarkBase
         public void Setup()
         {
             BaseSetup();
-            Context = new EFCoreContext(_connection.ConnectionString);
+            Context = new EFCoreContext(ConnectionString);
         }
 
         [Benchmark(Description = "First")]