!

.vs/BlockIPAddr/v17/DocumentLayout.backup.json

@@ -72,7 +72,7 @@
               "RelativeDocumentMoniker": "Program.cs",
               "ToolTip": "C:\\Repos\\BlockIPAddr\\Program.cs",
               "RelativeToolTip": "Program.cs",
-              "ViewState": "AgIAAAIAAAAAAAAAAAAqwDYAAAAKAAAAAAAAAA==",
+              "ViewState": "AgIAABgAAAAAAAAAAAAAACoAAAAHAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-06-27T16:11:33.579Z",
               "EditorCaption": ""
@@ -87,8 +87,7 @@
               "RelativeToolTip": "ClassObj\\ANSI.cs",
               "ViewState": "AgIAADgAAAAAAAAAAAAAAEoAAAARAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2025-06-30T08:09:46.703Z",
+              "WhenOpened": "2025-06-30T08:09:46.703Z"
-              "EditorCaption": ""
             }
           ]
         }

.vs/BlockIPAddr/v17/DocumentLayout.json

@@ -72,7 +72,7 @@
               "RelativeDocumentMoniker": "Program.cs",
               "ToolTip": "C:\\Repos\\BlockIPAddr\\Program.cs",
               "RelativeToolTip": "Program.cs",
-              "ViewState": "AgIAAAIAAAAAAAAAAAAqwBgAAAAmAAAAAAAAAA==",
+              "ViewState": "AgIAABgAAAAAAAAAAAAAACoAAAAHAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
               "WhenOpened": "2025-06-27T16:11:33.579Z",
               "EditorCaption": ""
@@ -87,8 +87,7 @@
               "RelativeToolTip": "ClassObj\\ANSI.cs",
               "ViewState": "AgIAADgAAAAAAAAAAAAAAEoAAAARAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2025-06-30T08:09:46.703Z",
+              "WhenOpened": "2025-06-30T08:09:46.703Z"
-              "EditorCaption": ""
             }
           ]
         }

Program.cs

@@ -24,6 +24,10 @@ internal class Program
           string rv;
           string color = string.Empty;
 
+          if (!IsValid(arg))
+            Console.WriteLine("{0}ERROR: '{1}{2}{0}' is not a valid IP4 address.{3}", ANSI.fgBrightRed, ANSI.fgBrightWhite, arg.Trim(), ANSI.fgReset);
+          else
+          {
             cm.Parameters["@ip4"].Value = arg.Trim();
             rv = cm.ExecuteScalar().ToString() ?? string.Empty;
 
@@ -32,16 +36,21 @@ internal class Program
           }
         }
       }
+    }
     else
     {
       while (true)
       {
-        string ip4 = string.Empty;
+        string? ip4 = string.Empty;
         Console.Write("\nEnter an IP Address to block (can include slash-notation) or Enter to Exit: ");
         ip4 = Console.ReadLine();
         if (string.IsNullOrWhiteSpace(ip4))
           break;
 
+        if (!IsValid(ip4))
+          Console.WriteLine("\n{0}ERROR: '{1}{2}{0}' is not a valid IP4 address.{3}", ANSI.fgBrightRed, ANSI.fgBrightWhite, ip4, ANSI.fgReset);
+        else
+        {
           using (var cn = new SqlConnection(kmCommonLibsCore.Constants.cnPortal))
           using (var cm = new SqlCommand("dbo.[BlockIPAddrInFirewall]", cn) { CommandType = System.Data.CommandType.StoredProcedure })
           {
@@ -57,4 +66,48 @@ internal class Program
         }
       }
     }
+  }
+
+  static internal bool IsValid(string ip)
+  {
+    bool rv = false;
+
+    try
+    {
+      if (ip.IndexOf('/') > 0)    // prevent it from being the first character
+      {
+        string[] part = ip.Split('/');
+
+        if (part.Length != 2)
+          rv = false;
+        else
+        {
+          System.Net.IPAddress? ip4 = null;
+          byte subMask = 0;
+
+          if (System.Net.IPAddress.TryParse(part[0].Trim(), out ip4))
+            rv = true;
+
+          if (rv && byte.TryParse(part[1].Trim(), out subMask))
+            rv = true;
+          else
+            rv = false;
+        }
+      }
+      else
+      {
+        System.Net.IPAddress? ip4 = null;
+        if (System.Net.IPAddress.TryParse(ip.Trim(), out ip4))
+          rv = true;
+        else
+          rv = false;
+      }
+    }
+    catch //(Exception)
+    {
+      rv = false;
+    }
+
+    return rv;
+  }
 }

Properties/PublishProfiles/FolderProfile.pubxml.user

@@ -2,7 +2,7 @@
 <!-- https://go.microsoft.com/fwlink/?LinkID=208121. -->
 <Project>
   <PropertyGroup>
-    <History>True|2025-06-30T08:39:28.6629030Z||;True|2025-06-30T04:04:51.2689872-04:00||;True|2025-06-30T04:02:09.8676131-04:00||;True|2025-06-27T12:28:32.0039427-04:00||;True|2025-06-27T12:27:16.4031564-04:00||;True|2025-06-27T12:23:51.7850485-04:00||;True|2025-06-27T12:13:48.5390689-04:00||;True|2025-06-27T12:12:59.9985493-04:00||;</History>
+    <History>True|2025-06-30T08:59:56.4591901Z||;True|2025-06-30T04:39:28.6629030-04:00||;True|2025-06-30T04:04:51.2689872-04:00||;True|2025-06-30T04:02:09.8676131-04:00||;True|2025-06-27T12:28:32.0039427-04:00||;True|2025-06-27T12:27:16.4031564-04:00||;True|2025-06-27T12:23:51.7850485-04:00||;True|2025-06-27T12:13:48.5390689-04:00||;True|2025-06-27T12:12:59.9985493-04:00||;</History>
     <LastFailureDetails />
   </PropertyGroup>
 </Project>

obj/Debug/net9.0-windows/BlockIPAddr.AssemblyInfo.cs

@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+76d5541e7e2e23eff1f7874ec3c40a46ef7e1f8d")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+efb7f1d0d738f43b349531543f29c49f3aeb5470")]
 [assembly: System.Reflection.AssemblyProductAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyTitleAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

obj/Debug/net9.0-windows/BlockIPAddr.AssemblyInfoInputs.cache

@@ -1 +1 @@
-61c37c42ee97e4459c046c73f3178cb9717e64e39648654751cd12b3dad0d28b
+c84dbfe279a9cd8c0873c77e2b29092480d38fd5ce8820b0e4f176205c0421bf

obj/Release/net9.0-windows/BlockIPAddr.AssemblyInfo.cs

@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Release")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+76d5541e7e2e23eff1f7874ec3c40a46ef7e1f8d")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+efb7f1d0d738f43b349531543f29c49f3aeb5470")]
 [assembly: System.Reflection.AssemblyProductAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyTitleAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

obj/Release/net9.0-windows/BlockIPAddr.AssemblyInfoInputs.cache

@@ -1 +1 @@
-87dc558f82f5265012bd9142dc02bd8e54fbd91b8009a10a518788f869939f12
+500f127d0ffbefeb4cde081852291a6f06e934c34e9f3103da7408e73bb57605

obj/Release/net9.0-windows/win-x64/BlockIPAddr.AssemblyInfo.cs

@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Release")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+76d5541e7e2e23eff1f7874ec3c40a46ef7e1f8d")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+efb7f1d0d738f43b349531543f29c49f3aeb5470")]
 [assembly: System.Reflection.AssemblyProductAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyTitleAttribute("BlockIPAddr")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

obj/Release/net9.0-windows/win-x64/BlockIPAddr.AssemblyInfoInputs.cache

@@ -1 +1 @@
-87dc558f82f5265012bd9142dc02bd8e54fbd91b8009a10a518788f869939f12
+500f127d0ffbefeb4cde081852291a6f06e934c34e9f3103da7408e73bb57605