For getting whiteboard info

dotnet/AipsCore/Application/Models/Whiteboard/Query/GetWhiteboard/GetWhiteboardQuery.cs

@@ -0,0 +1,5 @@
+using AipsCore.Application.Abstract.Query;
+
+namespace AipsCore.Application.Models.Whiteboard.Query.GetWhiteboard;
+
+public record GetWhiteboardQuery(string WhiteboardId) : IQuery<Infrastructure.Persistence.Whiteboard.Whiteboard?>;

dotnet/AipsCore/Application/Models/Whiteboard/Query/GetWhiteboard/GetWhiteboardQueryHandler.cs

@@ -0,0 +1,23 @@
+using AipsCore.Application.Abstract.Query;
+using AipsCore.Infrastructure.Persistence.Db;
+using Microsoft.EntityFrameworkCore;
+
+namespace AipsCore.Application.Models.Whiteboard.Query.GetWhiteboard;
+
+public class GetWhiteboardQueryHandler 
+    : IQueryHandler<GetWhiteboardQuery, Infrastructure.Persistence.Whiteboard.Whiteboard?>
+{
+    private readonly AipsDbContext _context;
+    
+    public GetWhiteboardQueryHandler(AipsDbContext context)
+    {
+        _context = context;
+    }
+    
+    public async Task<Infrastructure.Persistence.Whiteboard.Whiteboard?> Handle(GetWhiteboardQuery query, CancellationToken cancellationToken = default)
+    {
+        return await _context.Whiteboards
+            .Where(w => w.Id.ToString() == query.WhiteboardId)
+            .FirstOrDefaultAsync(cancellationToken);
+    }
+}