Downgrade to C# 5 syntax for .NET Framework MSBuild compatibility

Features/DeviceCompareService.cs

@@ -17,15 +17,10 @@ namespace Disco.Plugins.ADCompare.Features
             this.database = database;
         }
 
-        /// <summary>
-        /// Compare all Disco devices' assigned users against the AD computer managedBy field.
-        /// Only considers active (not decommissioned) devices with a domain ID.
-        /// </summary>
         public DeviceComparisonSummary CompareAllDevices()
         {
             var summary = new DeviceComparisonSummary();
 
-            // Load active devices that have a domain computer account
             var devices = database.Devices
                 .Include("AssignedUser")
                 .Where(d => d.DeviceDomainId != null && d.DecommissionedDate == null)
@@ -50,24 +45,18 @@ namespace Disco.Plugins.ADCompare.Features
             return summary;
         }
 
-        /// <summary>
-        /// Compare a single device's Disco assignment against AD managedBy.
-        /// </summary>
         public DeviceComparisonResult CompareDevice(Device device)
         {
-            var result = new DeviceComparisonResult
-            {
-                SerialNumber = device.SerialNumber,
-                DeviceDomainId = device.DeviceDomainId,
-                ComputerName = device.ComputerName,
-                DiscoAssignedUserId = device.AssignedUserId,
-                DiscoAssignedUserDisplayName = device.AssignedUser?.DisplayName,
-                HasAssignment = !string.IsNullOrEmpty(device.AssignedUserId)
-            };
+            var result = new DeviceComparisonResult();
+            result.SerialNumber = device.SerialNumber;
+            result.DeviceDomainId = device.DeviceDomainId;
+            result.ComputerName = device.ComputerName;
+            result.DiscoAssignedUserId = device.AssignedUserId;
+            result.DiscoAssignedUserDisplayName = device.AssignedUser != null ? device.AssignedUser.DisplayName : null;
+            result.HasAssignment = !string.IsNullOrEmpty(device.AssignedUserId);
 
             try
             {
-                // Look up the computer in AD, requesting the managedBy attribute
                 var adAccount = ActiveDirectory.RetrieveADMachineAccount(device.DeviceDomainId, new[] { "managedBy" });
 
                 if (adAccount == null)
@@ -80,12 +69,10 @@ namespace Disco.Plugins.ADCompare.Features
                 result.FoundInAD = true;
                 result.ADAccountDisabled = adAccount.IsDisabled;
 
-                // Get the managedBy DN from AD
                 var managedByDN = adAccount.GetPropertyValue<string>("managedBy");
                 result.ADManagedByDN = managedByDN;
                 result.HasManagedBy = !string.IsNullOrEmpty(managedByDN);
 
-                // Resolve managedBy DN to a DOMAIN\username
                 if (result.HasManagedBy)
                 {
                     try
@@ -98,17 +85,15 @@ namespace Disco.Plugins.ADCompare.Features
                         }
                         else
                         {
-                            result.ADManagedByUserId = managedByDN; // fallback to DN
+                            result.ADManagedByUserId = managedByDN;
                         }
                     }
                     catch
                     {
-                        // If we can't resolve the DN, store it raw
                         result.ADManagedByUserId = managedByDN;
                     }
                 }
 
-                // Now compare
                 result.IsMatch = DetermineMatch(result);
                 if (!result.IsMatch)
                 {
@@ -118,35 +103,26 @@ namespace Disco.Plugins.ADCompare.Features
             catch (Exception ex)
             {
                 result.FoundInAD = false;
-                result.MismatchReason = $"AD lookup error: {ex.Message}";
+                result.MismatchReason = "AD lookup error: " + ex.Message;
             }
 
             return result;
         }
 
-        /// <summary>
-        /// Determine if the Disco assignment matches the AD managedBy.
-        /// </summary>
         private bool DetermineMatch(DeviceComparisonResult result)
         {
-            // Both empty = match (neither has an assignment)
             if (!result.HasAssignment && !result.HasManagedBy)
                 return true;
 
-            // One has assignment, other doesn't = mismatch
             if (result.HasAssignment != result.HasManagedBy)
                 return false;
 
-            // Both have values - compare the user IDs (case-insensitive)
             return string.Equals(
                 result.DiscoAssignedUserId,
                 result.ADManagedByUserId,
                 StringComparison.OrdinalIgnoreCase);
         }
 
-        /// <summary>
-        /// Generate a human-readable reason for the mismatch.
-        /// </summary>
         private string DetermineMismatchReason(DeviceComparisonResult result)
         {
             if (!result.FoundInAD)
@@ -159,7 +135,7 @@ namespace Disco.Plugins.ADCompare.Features
                 return "Not assigned in Disco but AD managedBy is set";
 
             if (result.HasAssignment && result.HasManagedBy)
-                return $"Different users: Disco={result.DiscoAssignedUserId}, AD managedBy={result.ADManagedByUserId}";
+                return string.Format("Different users: Disco={0}, AD managedBy={1}", result.DiscoAssignedUserId, result.ADManagedByUserId);
 
             return "Unknown mismatch";
         }