👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-17

winforms datagridview csharp C#

I'm working through a tutorial and I've hit a wall trying to I'm currently working with an scenario with a WinForms application that uses a `DataGridView` to display dynamic data from a database. I want to change the cell background color based on specific conditions whenever the data updates. However, the `CellFormatting` event doesn't seem to trigger as expected when I call `DataGridView.Refresh()`. Here’s a simplified version of the code I’m using: ```csharp private void UpdateDataGridView() { // Fetch new data from the database var data = GetDataFromDatabase(); myDataGridView.DataSource = data; myDataGridView.Refresh(); // Attempting to refresh the DataGridView } private void myDataGridView_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e) { if (e.RowIndex >= 0 && e.ColumnIndex == myDataGridView.Columns["Status"].Index) { var statusValue = myDataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString(); if (statusValue == "behavior") { e.CellStyle.BackColor = Color.Red; } else if (statusValue == "Warning") { e.CellStyle.BackColor = Color.Yellow; } else { e.CellStyle.BackColor = Color.Green; } } } ``` The question arises when I call `UpdateDataGridView()`, and I notice that the cell formatting is not being applied as expected. The rows appear with the default formatting, and I'm not seeing my dynamically set colors. I've also tried calling `myDataGridView.Invalidate()` after setting the DataSource, but that didn't yield any results either. I confirmed that the `CellFormatting` event is subscribed correctly, and I'm logging messages to ensure it's being hit, but it seems like the event is being skipped after a data source change. I’m using .NET Framework 4.8 and Visual Studio 2019. Any insights on how to properly handle this situation would be greatly appreciated! I'm on CentOS using the latest version of C#. I'm working with C# in a Docker container on Windows 10. Has anyone dealt with something similar?