Build rdpthread.exe - RDP credential validator (C# via WNetAddConnection2)

build_rdpthread.bat

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+@echo off
+title Build rdpthread.exe
+cd /d "%~dp0"
+
+echo.
+echo  ╔════════════════════════════════════════════════════════╗
+echo  ║     Building rdpthread.exe - RDP Credential Validator  ║
+echo  ╚════════════════════════════════════════════════════════╝
+echo.
+
+:: Find the C# compiler
+set CSC=
+for %%d in (v4.0.30319 v3.5 v2.0.50727) do (
+    if exist "%windir%\Microsoft.NET\Framework\%%d\csc.exe" (
+        set CSC="%windir%\Microsoft.NET\Framework\%%d\csc.exe"
+        goto :compile
+    )
+)
+
+echo  [FAIL] C# compiler (csc.exe) not found!
+echo  Install .NET Framework SDK or Visual Studio Build Tools.
+pause
+exit /b 1
+
+:compile
+echo  [*] Found C# compiler: %CSC%
+echo  [*] Compiling rdpthread.cs...
+%CSC% /target:exe /out:rdpthread.exe /nologo rdpthread.cs
+if %errorlevel% neq 0 (
+    echo  [FAIL] Compilation failed
+    pause
+    exit /b 1
+)
+
+echo  [OK] rdpthread.exe built successfully
+echo.
+echo  Usage: rdpthread.exe ^<ip^> ^<port^> ^<username^> ^<password^>
+echo.
+pause