diff --git a/src/AzureIoTHub.Portal/Server/Services/DeviceService.cs b/src/AzureIoTHub.Portal/Server/Services/DeviceService.cs
index 661eb6e49..671330567 100644
--- a/src/AzureIoTHub.Portal/Server/Services/DeviceService.cs
+++ b/src/AzureIoTHub.Portal/Server/Services/DeviceService.cs
@@ -61,7 +61,7 @@ public async Task<PaginationResult<Twin>> GetAllEdgeDevice(
             if (!string.IsNullOrWhiteSpace(searchText))
             {
 #pragma warning disable CA1308 // Normalize strings to uppercase
-                filter += $" AND (STARTSWITH(deviceId, '{searchText.ToLowerInvariant()}') OR (is_defined(tags.deviceName) AND STARTSWITH(tags.deviceName, '{searchText}')))";
+                filter += $" AND (STARTSWITH(deviceId, '{searchText}') OR (is_defined(tags.deviceName) AND STARTSWITH(tags.deviceName, '{searchText}')))";
 #pragma warning restore CA1308 // Normalize strings to uppercase
             }
 
@@ -159,7 +159,7 @@ public async Task<PaginationResult<Twin>> GetAllDevice(
             if (!string.IsNullOrWhiteSpace(searchText))
             {
 #pragma warning disable CA1308 // Normalize strings to uppercase
-                filter += $" AND (STARTSWITH(deviceId, '{searchText.ToLowerInvariant()}') OR (is_defined(tags.deviceName) AND STARTSWITH(tags.deviceName, '{searchText}')))";
+                filter += $" AND (STARTSWITH(deviceId, '{searchText}') OR (is_defined(tags.deviceName) AND STARTSWITH(tags.deviceName, '{searchText}')))";
 #pragma warning restore CA1308 // Normalize strings to uppercase
             }