* Further improvements

OrdersManagement/Models/TransactionModel.cs

@@ -0,0 +1,29 @@
+namespace OrdersManagement.Models;
+
+public class TransactionModel : IEquatable<TransactionModel>
+{
+    public string? PartNumber { get; set; }
+    public string? ItemNumber { get; set; }
+    public decimal? Quantity { get; set; }
+
+
+    public bool Equals(TransactionModel? other)
+    {
+        if (other is null) return false;
+        if (ReferenceEquals(this, other)) return true;
+        return PartNumber == other.PartNumber;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is null) return false;
+        if (ReferenceEquals(this, obj)) return true;
+        if (obj.GetType() != GetType()) return false;
+        return Equals((TransactionModel)obj);
+    }
+
+    public override int GetHashCode()
+    {
+        return PartNumber.GetHashCode();
+    }
+}