Export a DataGridView to Excel (.xlsx) in VB.NET — Without Office Interop
The usual Interop loop stops working on the first PC without Office, and it quietly turns a ZIP code like 02134 into 2134. This VB.NET module writes a DataGridView to a real .xlsx file instead: visible columns in screen order, numbers as numbers, dates as dates, leading zeros intact. Complete code for ReoGrid V5 on .NET 10 and V4 on .NET Framework 4.8.
