C# multi-window to achieve the child the parent form, fit. Net beginners

Mdi多窗体程序
.............\Mdi多窗体程序
.............\Mdi多窗体程序.sln
.............\Mdi多窗体程序.suo
.............\.............\bin
.............\.............\...\Debug
.............\.............\...\.....\Mdi多窗体程序.exe
.............\.............\...\.....\Mdi多窗体程序.pdb
.............\.............\...\.....\Mdi多窗体程序.vshost.exe
.............\.............\...\Release
.............\.............\FormMdi.cs
.............\.............\FormMdi.Designer.cs
.............\.............\FormMdi.resx
.............\.............\Form_Child.cs
.............\.............\Form_Child.Designer.cs
.............\.............\Form_Child.resx
.............\.............\Mdi多窗体程序.csproj
.............\.............\obj
.............\.............\...\x86
.............\.............\...\...\Debug
.............\.............\...\...\.....\DesignTimeResolveAssemblyReferences.cache
.............\.............\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
.............\.............\...\...\.....\GenerateResource.read.1.tlog
.............\.............\...\...\.....\GenerateResource.write.1.tlog
.............\.............\...\...\.....\Mdi多窗体程序.csproj.FileListAbsolute.txt
.............\.............\...\...\.....\Mdi多窗体程序.exe
.............\.............\...\...\.....\Mdi多窗体程序.FormMdi.resources
.............\.............\...\...\.....\Mdi多窗体程序.Form_Child.resources
.............\.............\...\...\.....\Mdi多窗体程序.pdb
.............\.............\...\...\.....\Mdi多窗体程序.Properties.Resources.resources
.............\.............\...\...\.....\TempPE
.............\.............\Program.cs
.............\.............\Properties
.............\.............\..........\AssemblyInfo.cs
.............\.............\..........\Resources.Designer.cs
.............\.............\..........\Resources.resx
.............\.............\..........\Settings.Designer.cs
.............\.............\..........\Settings.settings

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