diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Handles/SafeLibraryHandle.netcore.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Handles/SafeLibraryHandle.netcore.cs
index 54512985f1..35142e1ee8 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Handles/SafeLibraryHandle.netcore.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Handles/SafeLibraryHandle.netcore.cs
@@ -2,7 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if NET && _WINDOWS
+#if NET
 
 using Microsoft.Win32.SafeHandles;
 
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32.cs
index 020726b104..5ff162d69e 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32.cs
@@ -8,7 +8,7 @@
 using Microsoft.Data.Common;
 using Microsoft.Win32.SafeHandles;
 
-#if !NETFRAMEWORK && _WINDOWS
+#if NET
 using Interop.Windows.Handles;
 #endif
 
@@ -19,11 +19,6 @@ internal static class Kernel32
         internal const ushort FILE_DEVICE_FILE_SYSTEM = 0x0009;
         internal const uint SEM_FAILCRITICALERRORS = 1;
 
-        #if _WINDOWS && !NETFRAMEWORK
-        internal const int LOAD_LIBRARY_AS_DATAFILE = 0x00000002;
-        internal const int LOAD_LIBRARY_SEARCH_SYSTEM32 = 0x00000800;
-        #endif
-
         private const string DllName = "kernel32.dll";
 
         /// <summary><a href="https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/defining-i-o-control-codes">CTL_CODE</a> method.</summary>
@@ -54,7 +49,7 @@ internal static extern bool DeviceIoControl(
             out uint cbBytesReturned,
             IntPtr overlapped);
 
-        #if NET && _WINDOWS
+        #if NET
         [DllImport(DllName, ExactSpelling = true, SetLastError = true)]
         public static extern bool FreeLibrary([In] IntPtr hModule);
         #endif
@@ -71,7 +66,7 @@ internal static extern int GetFullPathName(
             IntPtr lpFilePartOrNull);
         #endif
 
-        #if NET && _WINDOWS
+        #if NET
         [DllImport(DllName, CharSet = CharSet.Ansi, BestFitMapping = false)]
         public static extern IntPtr GetProcAddress(IntPtr hModule, string lpProcName);
 
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32Safe.netfx.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32Safe.netfx.cs
index 874614765f..95a5d81440 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32Safe.netfx.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Kernel32/Kernel32Safe.netfx.cs
@@ -1,8 +1,8 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if NETFRAMEWORK && _WINDOWS
+#if NETFRAMEWORK
 
 using System;
 using System.Runtime.InteropServices;
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/AuthProviderInfo.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/AuthProviderInfo.cs
index e273e5fc1b..7b0818b7c5 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/AuthProviderInfo.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/AuthProviderInfo.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System.Runtime.InteropServices;
 
 namespace Interop.Windows.Sni
@@ -25,5 +23,3 @@ internal struct AuthProviderInfo
         public string serverCertFileName;
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerInfo.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerInfo.cs
index fcb7b9a20d..358e35cda0 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerInfo.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerInfo.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System;
 using System.Runtime.InteropServices;
 
@@ -18,5 +16,3 @@ internal struct ConsumerInfo
         internal IntPtr key;
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerNumber.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerNumber.cs
index f7b11801c9..a1d4fdf292 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerNumber.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/ConsumerNumber.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum ConsumerNumber
@@ -14,5 +12,3 @@ internal enum ConsumerNumber
         SNI_Consumer_Invalid,
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Delegates.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Delegates.cs
index 720ad481e4..fd1f2d8e39 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Delegates.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Delegates.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System;
 using System.Runtime.InteropServices;
 
@@ -14,5 +12,3 @@ namespace Interop.Windows.Sni
     
     internal delegate IntPtr SqlClientCertificateDelegate(IntPtr pCallbackContext);
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/IoType.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/IoType.cs
index ef02350e84..167a7a23b5 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/IoType.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/IoType.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum IoType
@@ -12,5 +10,3 @@ internal enum IoType
         WRITE,
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Prefix.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Prefix.cs
index 52c98bfde9..45ec71a2cf 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Prefix.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Prefix.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum Prefix
@@ -16,5 +14,3 @@ internal enum Prefix
         INVALID_PREFIX,
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Provider.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Provider.cs
index c9bf7a980c..61b33ebfc1 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Provider.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/Provider.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum Provider
@@ -26,5 +24,3 @@ internal enum Provider
         INVALID_PROV,
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/QueryType.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/QueryType.cs
index 14de40336f..5fca987240 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/QueryType.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/QueryType.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum QueryType
@@ -49,5 +47,3 @@ internal enum QueryType
         #endif
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniClientConsumerInfo.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniClientConsumerInfo.cs
index 89199e4417..062c36679f 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniClientConsumerInfo.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniClientConsumerInfo.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System.Runtime.InteropServices;
 using Microsoft.Data.SqlClient;
 
@@ -36,5 +34,3 @@ internal unsafe struct SniClientConsumerInfo
         public SniDnsCacheInfo DNSCacheInfo;
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniConsumerInfo.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniConsumerInfo.cs
index 8cb27dfb5f..2f084f228d 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniConsumerInfo.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniConsumerInfo.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System;
 using System.Runtime.InteropServices;
 
@@ -23,5 +21,3 @@ internal struct SniConsumerInfo
         public IntPtr NodeAffinity;
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniDnsCacheInfo.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniDnsCacheInfo.cs
index 1d5600aec9..e0e3c91efe 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniDnsCacheInfo.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniDnsCacheInfo.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System.Runtime.InteropServices;
 
 namespace Interop.Windows.Sni
@@ -21,5 +19,3 @@ internal struct SniDnsCacheInfo
         public string wszCachedTcpPort;
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniError.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniError.cs
index 55f64a32d3..2e519c15ab 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniError.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniError.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 using System.Runtime.InteropServices;
 
 namespace Interop.Windows.Sni
@@ -23,5 +21,3 @@ internal struct SniError
         internal uint lineNumber;
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniSslProtocols.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniSslProtocols.cs
index f070082c16..cd9bf47ed3 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniSslProtocols.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SniSslProtocols.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum SniSslProtocols : uint
@@ -32,5 +30,3 @@ internal enum SniSslProtocols : uint
         SP_PROT_TLS1_3 = SP_PROT_TLS1_3_SERVER | SP_PROT_TLS1_3_CLIENT,
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SqlDependencyProcessDispatcherStorage.netfx.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SqlDependencyProcessDispatcherStorage.netfx.cs
index dc5b5be57e..57481d18b3 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SqlDependencyProcessDispatcherStorage.netfx.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/SqlDependencyProcessDispatcherStorage.netfx.cs
@@ -2,7 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if NETFRAMEWORK && _WINDOWS
+#if NETFRAMEWORK
 
 using System;
 using System.Diagnostics;
diff --git a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/TransparentNetworkResolutionMode.cs b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/TransparentNetworkResolutionMode.cs
index 8d1ac82449..fe68cd420d 100644
--- a/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/TransparentNetworkResolutionMode.cs
+++ b/src/Microsoft.Data.SqlClient/src/Interop/Windows/Sni/TransparentNetworkResolutionMode.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if _WINDOWS
-
 namespace Interop.Windows.Sni
 {
     internal enum TransparentNetworkResolutionMode : byte
@@ -13,5 +11,3 @@ internal enum TransparentNetworkResolutionMode : byte
         ParallelMode
     }
 }
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft.Data.SqlClient.csproj b/src/Microsoft.Data.SqlClient/src/Microsoft.Data.SqlClient.csproj
index 06eaf9e914..fbaac6b755 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft.Data.SqlClient.csproj
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft.Data.SqlClient.csproj
@@ -235,7 +235,9 @@
     <!-- This file does not support pre-processor directives, so it must be conditionally         -->
     <!-- included into the build.                                                                 -->
     <EmbeddedResource Include="Resources\ILLink.Substitutions.xml"
-                      Condition="'$(NormalizedTargetOs)' == 'windows_nt' AND '$(TargetFramework)' != 'net462'" />
+                      Condition="'$(NormalizedTargetOs)' == 'windows_nt' AND '$(TargetFramework)' != 'net462'">
+      <LogicalName>ILLink.Substitutions.xml</LogicalName>
+    </EmbeddedResource>
 
     <!-- Used by SqlMetaDataFactory to construct its DataSet -->
     <EmbeddedResource Include="Resources\Microsoft.Data.SqlClient.SqlMetaData.xml">
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.netfx.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.netfx.cs
index 99f627d603..d1d001448e 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.netfx.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/Common/AdapterUtil.netfx.cs
@@ -13,9 +13,7 @@
 using System.Text;
 using System.Threading.Tasks;
 
-#if _WINDOWS
 using Interop.Windows.Kernel32;
-#endif
 
 namespace Microsoft.Data.Common
 {
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Diagnostics/SqlClientMetrics.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Diagnostics/SqlClientMetrics.cs
index ed27a9591f..cb8c224440 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Diagnostics/SqlClientMetrics.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Diagnostics/SqlClientMetrics.cs
@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
@@ -9,9 +9,7 @@
 #if NET
 using System.Threading;
 #else
-#if _WINDOWS
 using Interop.Windows.Kernel32;
-#endif
 using Microsoft.Data.Common;
 
 using System.Diagnostics;
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/LocalAppContextSwitches.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/LocalAppContextSwitches.cs
index 85f8c87937..06bf6c4f0e 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/LocalAppContextSwitches.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/LocalAppContextSwitches.cs
@@ -139,7 +139,7 @@ internal static class LocalAppContextSwitches
     private const string UseOverallConnectTimeoutForPoolWaitString =
         "Switch.Microsoft.Data.SqlClient.UseOverallConnectTimeoutForPoolWait";
 
-    #if NET && _WINDOWS
+    #if NET
     /// <summary>
     /// The name of the app context switch that controls whether to use the
     /// managed SNI implementation instead of the native SNI implementation on
@@ -258,7 +258,7 @@ private enum SwitchValue : byte
     /// </summary>
     private static SwitchValue s_useOverallConnectTimeoutForPoolWait = SwitchValue.None;
 
-    #if NET && _WINDOWS
+    #if NET
     /// <summary>
     /// The cached value of the UseManagedNetworking switch.
     /// </summary>
@@ -612,7 +612,7 @@ public static bool UseCompatibilityAsyncBehaviour
             defaultValue: false,
             ref s_useOverallConnectTimeoutForPoolWait);
 
-    #if NET && _WINDOWS
+    #if NET
     /// <summary>
     /// When set to true, .NET on Windows will use the managed SNI
     /// implementation instead of the native SNI implementation.
@@ -621,24 +621,22 @@ public static bool UseCompatibilityAsyncBehaviour
     /// trimmed away when the corresponding AppContext switch is set at compile
     /// time. In such cases, this property will return a constant value, even if
     /// the AppContext switch is set or reset at runtime. See the
-    /// ILLink.Substitutions.Windows.xml and ILLink.Substitutions.Unix.xml
-    /// resource files for details.
+    /// ILLink.Substitutions.xml resource file for details.
     ///
-    /// The default value of this switch is false.
+    /// The default value of this switch is false on Windows and true on non-Windows platforms.
     /// </summary>
     public static bool UseManagedNetworking
     {
         get
         {
-            if (s_useManagedNetworking != SwitchValue.None)
+            if (!OsConstants.IsWindows)
             {
-                return s_useManagedNetworking == SwitchValue.True;
+                return true;
             }
 
-            if (!OsConstants.IsWindows)
+            if (s_useManagedNetworking != SwitchValue.None)
             {
-                s_useManagedNetworking = SwitchValue.True;
-                return true;
+                return s_useManagedNetworking == SwitchValue.True;
             }
 
             if (AppContext.TryGetSwitch(UseManagedNetworkingOnWindowsString, out bool returnedValue) && returnedValue)
@@ -651,12 +649,6 @@ public static bool UseManagedNetworking
             return false;
         }
     }
-    #elif NET
-    /// <summary>
-    /// .NET Core on Unix does not support native SNI, so this will always be
-    /// true.
-    /// </summary>
-    public static bool UseManagedNetworking => true;
     #else
     /// <summary>
     /// .NET Framework does not support the managed SNI, so this will always be
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.windows.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.cs
similarity index 96%
rename from src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.windows.cs
rename to src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.cs
index bd45d307a1..6dfa1c351f 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.windows.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.cs
@@ -1,8 +1,8 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if NET && _WINDOWS
+#if NET
 
 using System;
 using System.Runtime.InteropServices;
@@ -11,6 +11,7 @@
 using Interop.Windows.Kernel32;
 using Microsoft.Win32;
 using Microsoft.Data.SqlClient.Internal;
+using Microsoft.Data.Common;
 
 namespace Microsoft.Data.SqlClient.ManagedSni
 {
@@ -44,8 +45,16 @@ [Out] [MarshalAs(UnmanagedType.LPWStr)] StringBuilder sqlConnectionDataSource,
 
         private LocalDB() { }
 
-        internal static string GetLocalDBConnectionString(string localDbInstance) =>
-            Instance.LoadUserInstanceDll() ? Instance.GetConnectionString(localDbInstance) : null;
+        internal static string GetLocalDBConnectionString(string localDbInstance)
+        {
+            // LocalDB is not available for Unix and hence it cannot be supported.
+            if (!OsConstants.IsWindows)
+            {
+                throw new PlatformNotSupportedException(Strings.LocalDBNotSupported);
+            }
+
+            return Instance.LoadUserInstanceDll() ? Instance.GetConnectionString(localDbInstance) : null;
+        }
 
         internal static IntPtr GetProcAddress(string functionName) =>
             Instance.LoadUserInstanceDll() ? Kernel32.GetProcAddress(LocalDB.Instance._sqlUserInstanceLibraryHandle, functionName) : IntPtr.Zero;
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.unix.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.unix.cs
deleted file mode 100644
index 64ba1da0f8..0000000000
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/LocalDB.netcore.unix.cs
+++ /dev/null
@@ -1,20 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-#if NET && _UNIX
-
-using System;
-
-namespace Microsoft.Data.SqlClient.ManagedSni
-{
-    internal class LocalDB
-    {
-        internal static string GetLocalDBConnectionString(string localDbInstance)
-        {
-            throw new PlatformNotSupportedException(Strings.LocalDBNotSupported); // LocalDB is not available for Unix and hence it cannot be supported.
-        }
-    }
-}
-
-#endif
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlDependency.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlDependency.cs
index a101099dd8..0e9df041de 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlDependency.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlDependency.cs
@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
@@ -20,9 +20,7 @@
 using System.Runtime.Remoting;
 using System.Runtime.Serialization;
 using System.Security.Permissions;
-#if _WINDOWS
 using Interop.Windows.Sni;
-#endif
 using Microsoft.Data.SqlClient.LocalDb;
 #endif