diff --git a/backend/IM_API/Configs/ServiceCollectionExtensions.cs b/backend/IM_API/Configs/ServiceCollectionExtensions.cs
new file mode 100644
index 0000000..b7ee2c6
--- /dev/null
+++ b/backend/IM_API/Configs/ServiceCollectionExtensions.cs
@@ -0,0 +1,10 @@
+namespace IM_API.Configs
+{
+    public static class ServiceCollectionExtensions
+    {
+        public static IServiceCollection AddAllService(this IServiceCollection services, IConfiguration configuration)
+        {
+            return services;
+        }
+     }
+}
diff --git a/backend/IM_API/Dtos/TestDto.cs b/backend/IM_API/Dtos/TestDto.cs
new file mode 100644
index 0000000..bd689d6
--- /dev/null
+++ b/backend/IM_API/Dtos/TestDto.cs
@@ -0,0 +1,8 @@
+namespace IM_API.Dtos
+{
+    public class TestDto
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}
diff --git a/backend/IM_API/Interface/Services/IDemo.cs b/backend/IM_API/Interface/Services/IDemo.cs
new file mode 100644
index 0000000..75bf461
--- /dev/null
+++ b/backend/IM_API/Interface/Services/IDemo.cs
@@ -0,0 +1,9 @@
+using IM_API.Dtos;
+
+namespace IM_API.Interface.Services
+{
+    public interface IDemo
+    {
+        TestDto Test();
+    }
+}
diff --git a/backend/IM_API/Models/IMDbContext.cs b/backend/IM_API/Models/IMDbContext.cs
index 39bc38f..5215258 100644
--- a/backend/IM_API/Models/IMDbContext.cs
+++ b/backend/IM_API/Models/IMDbContext.cs
@@ -50,10 +50,6 @@ public partial class IMDbContext : DbContext
 
     public virtual DbSet<User> Users { get; set; }
 
-    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
-#warning To protect potentially sensitive information in your connection string, you should move it out of source code. You can avoid scaffolding the connection string by using the Name= syntax to read it from configuration - see https://go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see https://go.microsoft.com/fwlink/?LinkId=723263.
-        => optionsBuilder.UseMySql("server=192.168.5.100;port=3306;database=IM;user=root;password=768788Dyw", Microsoft.EntityFrameworkCore.ServerVersion.Parse("5.7.44-mysql"));
-
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         modelBuilder
diff --git a/backend/IM_API/Program.cs b/backend/IM_API/Program.cs
index 96341b4..e906aee 100644
--- a/backend/IM_API/Program.cs
+++ b/backend/IM_API/Program.cs
@@ -1,4 +1,8 @@
 
+using IM_API.Configs;
+using IM_API.Models;
+using Microsoft.EntityFrameworkCore;
+
 namespace IM_API
 {
     public class Program
@@ -8,7 +12,17 @@ namespace IM_API
             var builder = WebApplication.CreateBuilder(args);
 
             // Add services to the container.
+            IConfiguration configuration = new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
+            .Build();
+            string conStr = builder.Configuration.GetConnectionString("DefaultConnection")!;
 
+            builder.Services.AddDbContext<IMDbContext>(options =>
+            {
+                options.UseMySql(conStr,ServerVersion.AutoDetect(conStr));
+            });
+            builder.Services.AddAllService(configuration);
             builder.Services.AddControllers();
             // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
             builder.Services.AddEndpointsApiExplorer();
diff --git a/backend/IM_API/Services/Demo.cs b/backend/IM_API/Services/Demo.cs
new file mode 100644
index 0000000..4c12ef6
--- /dev/null
+++ b/backend/IM_API/Services/Demo.cs
@@ -0,0 +1,13 @@
+using IM_API.Dtos;
+using IM_API.Interface.Services;
+
+namespace IM_API.Services
+{
+    public class Demo : IDemo
+    {
+        public TestDto Test()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/backend/IM_API/appsettings.json b/backend/IM_API/appsettings.json
index 10f68b8..eb0a86a 100644
--- a/backend/IM_API/appsettings.json
+++ b/backend/IM_API/appsettings.json
@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=192.168.5.100;Port=3306;Database=IM;User=root;Password=768788Dyw;"
+  }
 }