Refactor this method to reduce its Cognitive Complexity from 31 to the 15 allowed. (https://rules.sonarsource.com/csharp/RSPEC-3776)

Indexing at Count-1 should be used instead of the "Enumerable" extension method "Last" (https://rules.sonarsource.com/csharp/RSPEC-6608)

Refactor this method to reduce its Cognitive Complexity from 22 to the 15 allowed. (https://rules.sonarsource.com/csharp/RSPEC-3776)

This call site is reachable on all platforms. 'Application.SetCompatibleTextRenderingDefault(bool)' is only supported on: 'windows' 6.1 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on all platforms. 'Application.Run(Form)' is only supported on: 'windows' 6.1 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on all platforms. 'Application.EnableVisualStyles()' is only supported on: 'windows' 6.1 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on all platforms. 'TextBox.Text' is only supported on: 'windows' 6.1 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on all platforms. 'Control.Enabled' is only supported on: 'windows' 6.1 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on all platforms. 'RadioButton.Checked' is only supported on: 'windows' 6.1 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)