update from old git

web/App_Code/Model/Partial/GuaDanOrder.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+
+/// <summary>
+/// GuaDanOrder 的摘要描述
+/// </summary>
+namespace Model
+{
+    public partial class GuaDanOrder
+    {
+        public static string GenerateStatusCode()
+        {
+            string prefix = "GD";
+            string datePart = DateTime.Now.ToString("yyyyMMdd");
+            string randomPart = Guid.NewGuid().ToString("N").Substring(0, 4).ToUpper();
+            return $"{prefix}{datePart}-{randomPart}";
+        }
+    }
+}