C# multi-form design is given an instance, you can understand by this example of multi-form design of C#

MDIWindows\MDIWindows\bin\Debug\MDIWindows.exe
..........\..........\...\.....\MDIWindows.pdb
..........\..........\...\.....\MDIWindows.vshost.exe
..........\..........\...\.....\MDIWindows.vshost.exe.manifest
..........\..........\...\.....\Mymenu.ini
..........\..........\...\Release\MDIWindows.exe
..........\..........\...\.......\MDIWindows.pdb
..........\..........\FACE02.ICO
..........\..........\Form1.cs
..........\..........\Form1.Designer.cs
..........\..........\Form1.resx
..........\..........\MDIWindows.csproj
..........\..........\obj\Debug\MDIWindows.csproj.FileListAbsolute.txt
..........\..........\...\.....\MDIWindows.csproj.GenerateResource.Cache
..........\..........\...\.....\MDIWindows.exe
..........\..........\...\.....\MDIWindows.Form1.resources
..........\..........\...\.....\MDIWindows.pdb
..........\..........\...\.....\MDIWindows.Properties.Resources.resources
..........\..........\...\Release\MDIWindows.csproj.FileListAbsolute.txt
..........\..........\...\.......\MDIWindows.csproj.GenerateResource.Cache
..........\..........\...\.......\MDIWindows.exe
..........\..........\...\.......\MDIWindows.Form1.resources
..........\..........\...\.......\MDIWindows.pdb
..........\..........\...\.......\MDIWindows.Properties.Resources.resources
..........\..........\Program.cs
..........\..........\...perties\AssemblyInfo.cs
..........\..........\..........\Resources.Designer.cs
..........\..........\..........\Resources.resx
..........\..........\..........\Settings.Designer.cs
..........\..........\..........\Settings.settings
..........\MDIWindows.sln
..........\MDIWindows.suo
..........\..........\obj\Debug\TempPE
..........\..........\bin\Debug
..........\..........\...\Release
..........\..........\obj\Debug
..........\..........\...\Release
..........\..........\bin
..........\..........\obj
..........\..........\Properties
..........\MDIWindows
MDIWindows

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