Simple log in system user login to open another form

EngineWindowsApplication1
.........................\EngineWindowsApplication1
.........................\.........................\EngineWindowsApplication1.csproj
.........................\.........................\EngineWindowsApplication1.csproj.user
.........................\.........................\LicenseInitializer.Designer.cs
.........................\.........................\LicenseInitializer.cs
.........................\.........................\Login.Designer.cs
.........................\.........................\Login.cs
.........................\.........................\Login.resx
.........................\.........................\Mainform.Designer.cs
.........................\.........................\Mainform.cs
.........................\.........................\Mainform.resx
.........................\.........................\Program.cs
.........................\.........................\Properties
.........................\.........................\..........\AssemblyInfo.cs
.........................\.........................\..........\Resources.Designer.cs
.........................\.........................\..........\Resources.resx
.........................\.........................\..........\Settings.Designer.cs
.........................\.........................\..........\Settings.settings
.........................\.........................\app.config
.........................\.........................\bin
.........................\.........................\...\Debug
.........................\.........................\...\.....\EngineWindowsApplication1.exe
.........................\.........................\...\.....\EngineWindowsApplication1.exe.config
.........................\.........................\...\.....\EngineWindowsApplication1.pdb
.........................\.........................\...\.....\EngineWindowsApplication1.vshost.exe
.........................\.........................\...\.....\EngineWindowsApplication1.vshost.exe.config
.........................\.........................\...\Release
.........................\.........................\obj
.........................\.........................\...\x86
.........................\.........................\...\...\Debug
.........................\.........................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
.........................\.........................\...\...\.....\EngineWindowsApplication1.Mainform.resources
.........................\.........................\...\...\.....\EngineWindowsApplication1.Properties.Resources.resources
.........................\.........................\...\...\.....\EngineWindowsApplication1.csproj.FileListAbsolute.txt
.........................\.........................\...\...\.....\EngineWindowsApplication1.exe
.........................\.........................\...\...\.....\EngineWindowsApplication1.login.resources
.........................\.........................\...\...\.....\EngineWindowsApplication1.pdb
.........................\.........................\...\...\.....\GenerateResource-ResGen.read.1.tlog
.........................\.........................\...\...\.....\GenerateResource-ResGen.write.1.tlog
.........................\.........................\...\...\.....\ResolveAssemblyReference.cache
.........................\.........................\...\...\.....\TempPE
.........................\.........................\...\...\.....\......\Properties.Resources.Designer.cs.dll
.........................\EngineWindowsApplication1.sln
.........................\EngineWindowsApplication1.suo

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