diff --git a/PipingHot/PipingHot/DataModels/BuyerDataModel.cs b/PipingHot/PipingHot/DataModels/BuyerDataModel.cs
new file mode 100644
index 0000000..1fe5e47
--- /dev/null
+++ b/PipingHot/PipingHot/DataModels/BuyerDataModel.cs
@@ -0,0 +1,33 @@
+using PipingHot.Extensions;
+using PipingHot.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace PipingHot.DataModels;
+
+public class BuyerDataModel(string id, string fio, string phonenumber):IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string FIO { get; private set; } = fio;
+    public string PhoneNumber { get; private set; } = phonenumber;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (FIO.IsEmpty())
+            throw new ValidationException("Field FIO is empty");
+        if (PhoneNumber.IsEmpty())
+            throw new ValidationException("Field PhoneNumber is empty");
+        if (!Regex.IsMatch(PhoneNumber, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\-]?)?[\d\- ]{7,10}$"))
+            throw new ValidationException("Field PhoneNumber is not a phone number");
+    }
+}
diff --git a/PipingHot/PipingHot/DataModels/PostDataModel.cs b/PipingHot/PipingHot/DataModels/PostDataModel.cs
new file mode 100644
index 0000000..528ec08
--- /dev/null
+++ b/PipingHot/PipingHot/DataModels/PostDataModel.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PipingHot.DataModels;
+
+public class PostDataModel
+{
+
+}
diff --git a/PipingHot/PipingHot/DataModels/RestaurantDataModel.cs b/PipingHot/PipingHot/DataModels/RestaurantDataModel.cs
new file mode 100644
index 0000000..c1d62b5
--- /dev/null
+++ b/PipingHot/PipingHot/DataModels/RestaurantDataModel.cs
@@ -0,0 +1,29 @@
+using PipingHot.Extensions;
+using PipingHot.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PipingHot.DataModels;
+
+public class RestaurantDataModel(string id, string name, string adress): IValidation
+{
+    public string Id { get; private set; } = id;
+    public string Name { get; private set; } = name;
+    public string Adress { get; private set; } = adress;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (Name.IsEmpty())
+            throw new ValidationException("Field Name is empty");
+        if (Adress.IsEmpty())
+            throw new ValidationException("Field Adress is empty");
+    }
+}
diff --git a/PipingHot/PipingHot/Enums/PostType.cs b/PipingHot/PipingHot/Enums/PostType.cs
new file mode 100644
index 0000000..4a57049
--- /dev/null
+++ b/PipingHot/PipingHot/Enums/PostType.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PipingHot.Enums;
+
+public enum PostType
+{
+    None = 0,
+    Operator = 1,
+    Aggregator = 2,
+    Deliveryman = 3
+
+}
diff --git a/PipingHot/PipingHot/Exceptions/ValidationException.cs b/PipingHot/PipingHot/Exceptions/ValidationException.cs
new file mode 100644
index 0000000..8b5d172
--- /dev/null
+++ b/PipingHot/PipingHot/Exceptions/ValidationException.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PipingHot.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+}
diff --git a/PipingHot/PipingHot/Extensions/StringExtensions.cs b/PipingHot/PipingHot/Extensions/StringExtensions.cs
new file mode 100644
index 0000000..b21c5d7
--- /dev/null
+++ b/PipingHot/PipingHot/Extensions/StringExtensions.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PipingHot.Extensions;
+
+public static class StringExtensions
+{
+    public static bool IsEmpty(this string str)
+    {
+        return string.IsNullOrEmpty(str);
+    }
+    public static bool IsGuid(this string str)
+    {
+        return Guid.TryParse(str, out _);
+    }
+}
diff --git a/PipingHot/PipingHot/Infrastructure/IValidation.cs b/PipingHot/PipingHot/Infrastructure/IValidation.cs
new file mode 100644
index 0000000..f13340d
--- /dev/null
+++ b/PipingHot/PipingHot/Infrastructure/IValidation.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PipingHot.Infrastructure;
+
+public interface IValidation
+{
+    void Validate();
+}