C#/VB.NET Desktop App Development

I have a desktop solution that mixes C# (WPF, a few ASP-NET-style service layers) and VB.NET (classic Windows Forms). Both stacks matter equally, so code will sometimes jump between the two.

Current priorities are:

• Robust user-authentication built directly into the client
• Smooth, responsive data-visualisation screens (charts/grids)
• Reliable file-handling routines for import, export and local storage

The existing repository is in Git; each module compiles under the latest stable .NET. I’ll grant access branch-by-branch so we can review pull requests together before merging.

Deliverable is a working desktop build with clear, well-commented source that shows the three features above fully integrated and tested on Windows 10/11. If a lightweight service or helper library is needed to bridge WPF and WinForms components, include it in the same solution.

Let me know your estimated turnaround for the first milestone (authentication) and any libraries or charting controls you prefer to use.