diff --git a/client/src/components/CodeEditorMonaco/const.ts b/client/src/components/CodeEditorMonaco/const.ts
index 00b5249..63d86c7 100644
--- a/client/src/components/CodeEditorMonaco/const.ts
+++ b/client/src/components/CodeEditorMonaco/const.ts
@@ -40,5 +40,16 @@ echo 'hello world!';`,
 int main() {
   printf("Hello, World");
   return (0);
+}`,
+  [CodeType.dotnet]: `using System;
+namespace CodeApplication
+{
+    class Code
+    {
+      static void Main(string[] args)
+      {
+          Console.WriteLine("Hello World!");
+      }
+    }
 }`,
 };
diff --git a/client/src/components/CodeEditorMonaco/index.tsx b/client/src/components/CodeEditorMonaco/index.tsx
index d57c1a7..c0a6428 100644
--- a/client/src/components/CodeEditorMonaco/index.tsx
+++ b/client/src/components/CodeEditorMonaco/index.tsx
@@ -34,7 +34,8 @@ type monacoLang =
   | 'java'
   | 'php'
   | 'rust'
-  | 'c';
+  | 'c'
+  | 'csharp';
 
 export interface Expose {
   getEditor: () => monaco.editor.IStandaloneCodeEditor | null;
@@ -49,6 +50,7 @@ const languageMap: Record<CodeType, monacoLang> = {
   [CodeType.php]: 'php',
   [CodeType.rust]: 'rust',
   [CodeType.c]: 'c',
+  [CodeType.dotnet]: 'csharp',
 };
 
 const Component = (props: Props, ref: ForwardedRef<Expose>) => {
diff --git a/client/src/utils/codeType.ts b/client/src/utils/codeType.ts
index 7f55572..888c73a 100644
--- a/client/src/utils/codeType.ts
+++ b/client/src/utils/codeType.ts
@@ -7,6 +7,7 @@ export enum CodeType {
   php = 'php',
   rust = 'rust',
   c = 'c',
+  dotnet = 'dotnet',
 }
 
 export enum CodeEnv {
@@ -18,6 +19,7 @@ export enum CodeEnv {
   php = 'php:8',
   rust = 'rust:latest',
   c = 'cpp:11',
+  dotnet = 'dotnet:lts',
 }
 
 export enum FileSuffix {
@@ -29,4 +31,5 @@ export enum FileSuffix {
   php = 'php',
   rust = 'rs',
   c = 'c',
+  dotnet = 'cs',
 }
diff --git a/server/src/docker/dotnet/Dockerfile b/server/src/docker/dotnet/Dockerfile
new file mode 100644
index 0000000..8a39edd
--- /dev/null
+++ b/server/src/docker/dotnet/Dockerfile
@@ -0,0 +1 @@
+FROM mono:latest
\ No newline at end of file
diff --git a/server/src/docker/index.ts b/server/src/docker/index.ts
index aed55f4..2842715 100644
--- a/server/src/docker/index.ts
+++ b/server/src/docker/index.ts
@@ -96,6 +96,12 @@ expand_arg_files()
     shellWithStdin: 'g++ code.c -o code.out && ./code.out < input.txt',
     fileSuffix: FileSuffix.c,
   },
+  dotnet: {
+    env: CodeEnv.dotnet,
+    shell: 'mcs -out:code.exe code.cs && mono code.exe',
+    shellWithStdin: 'mcs -out:code.exe code.cs && mono code.exe < input.txt',
+    fileSuffix: FileSuffix.dotnet,
+  },
 };
 
 export async function run2(params: {
diff --git a/server/src/utils/type.ts b/server/src/utils/type.ts
index 7f55572..e59dedd 100644
--- a/server/src/utils/type.ts
+++ b/server/src/utils/type.ts
@@ -7,6 +7,7 @@ export enum CodeType {
   php = 'php',
   rust = 'rust',
   c = 'c',
+  dotnet = 'dotnet',
 }
 
 export enum CodeEnv {
@@ -18,6 +19,7 @@ export enum CodeEnv {
   php = 'php:8',
   rust = 'rust:latest',
   c = 'cpp:11',
+  dotnet = 'mono:lts',
 }
 
 export enum FileSuffix {
@@ -29,4 +31,5 @@ export enum FileSuffix {
   php = 'php',
   rust = 'rs',
   c = 'c',
+  dotnet = 'cs',
 }