Description: Many times we met we need to fill another drop-down or a combination of value-based. Even if there is demand, we need to populate the list box items based on more selected value. In this code, I' ll show you a solution to the same use WPF.
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File list (Check if you may need any files):
CascadingDropDown
CascadingDropDown.gpState
CascadingDropDown.sln
CascadingDropDown.suo
.................\App.xaml
.................\App.xaml.cs
.................\bin
.................\...\Debug
.................\...\.....\CascadingDropDown.pdb
.................\...\.....\CascadingDropDown.vshost.exe.manifest
.................\CascadingDropDown.csproj
.................\CascadingDropDown.csproj.user
.................\City.cs
.................\Country.cs
.................\DataSource.cs
.................\obj
.................\...\Debug
.................\...\.....\App.g.cs
.................\...\.....\CascadingDropDown.csproj.FileListAbsolute.txt
.................\...\.....\CascadingDropDown.csproj.GenerateResource.Cache
.................\...\.....\CascadingDropDown.g.resources
.................\...\.....\CascadingDropDown.pdb
.................\...\.....\CascadingDropDown.Properties.Resources.resources
.................\...\.....\CascadingDropDown_MarkupCompile.cache
.................\...\.....\Refactor
.................\...\.....\TempPE
.................\...\.....\Window1.baml
.................\...\.....\Window1.g.cs
.................\Properties
.................\..........\AssemblyInfo.cs
.................\..........\Resources.Designer.cs
.................\..........\Resources.resx
.................\..........\Settings.Designer.cs
.................\..........\Settings.settings
.................\State.cs
.................\StateCountryViewModel.cs
.................\Window1.xaml
.................\Window1.xaml.cs
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