diff --git a/.github/workflows/dotnet-ci.yml b/.github/workflows/dotnet-ci.yml
new file mode 100644
index 0000000..e93d77c
--- /dev/null
+++ b/.github/workflows/dotnet-ci.yml
@@ -0,0 +1,42 @@
+name: .NET CI
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build-and-test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, windows-latest, macos-latest ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 8.0.x
+
+      - name: Cache NuGet packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
+      - name: Restore
+        run: dotnet restore MyNumberNET.sln
+
+      - name: Build
+        run: dotnet build MyNumberNET.sln --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test MyNumberNET.sln --configuration Release --no-build --verbosity normal