OnlyCSharp.Sheets — a real formula engine, wired

Every Total below is computed at build time by the OnlyCSharp 3.0 ComputerScience.Fast.Sheet.OcSheet engine — A1-style cell references, arithmetic, and dependency recalculation — not a typed-in number and not a re-implemented evaluator. Green cells are formulas; their source is shown beneath the value. Authored as .razor, rendered to static HTML.

ABCD
1ItemQtyPriceTotal
2Apples326=B2*C2
3Bread5420=B3*C3
4Coffee21020=B4*C4
5Total46=D2+D3+D4

↻ live dependency recalculation

Edit B2 (Apples qty): 3 → 10
the engine recomputes every dependent automatically:
  D2 =B2*C2: 6 → 20
  D5 =D2+D3+D4: 46 → 60