diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..1d3614d
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,26 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": ".NET Core Launch (console)",
+      "type": "coreclr",
+      "request": "launch",
+      "preLaunchTask": "build",
+      "program": "${workspaceFolder}/bin/Debug/net8.0/resequence_pgsql.dll",
+      "args": [
+        "-ip:192.168.0.108",
+        "-u:mcarman",
+        "-pwd:@ng31F@rm0823262",
+        "-lip:127.0.0.1",
+        "-p:5432",
+        "-db:accessdb_v3"
+      ],
+      "cwd": "${workspaceFolder}",
+      "stopAtEntry": false,
+      "console": "internalConsole"
+    }
+  ]
+}
diff --git a/ArgHelper.cs b/ArgHelper.cs
index 16ff806..2acbf5f 100644
--- a/ArgHelper.cs
+++ b/ArgHelper.cs
@@ -31,11 +31,11 @@ namespace resequence_pgsql
     }
     public class ArgSimple
     {
-        public string ip { get; set; }
-        public string un { get; set; }
-        public string pwd { get; set; }
-        public string lip { get; set; }
-        public int port { get; set; }
-        public string db { get; set; }
+        public string ip { get; set; } = string.Empty;
+        public string un { get; set; } = string.Empty;
+        public string pwd { get; set; } = string.Empty;
+        public string lip { get; set; } = string.Empty;
+        public int? port { get; set; } = null;
+        public string db { get; set; } = string.Empty;
     }
 }
\ No newline at end of file
diff --git a/Program.cs b/Program.cs
index 634e09b..18ea787 100644
--- a/Program.cs
+++ b/Program.cs
@@ -12,7 +12,7 @@ if (args.Length == 0)
 else
 {
     ArgSimple arg = ArgHelper.GetArgs(args);
-    using (PGHelper pg = new PGHelper(arg.ip, arg.un, arg.pwd, arg.lip, arg.port, arg.db))
+    using (PGHelper pg = new PGHelper(arg.ip, arg.un, arg.pwd, arg.lip, Convert.ToInt32(arg.port), arg.db))
     {
         pg.ResequenceTables();
     }