WinForms Data Grid - Draw a thick border under a data cell (PaintEx event)

This example shows how to draw a thick border around a grid cell under the mouse pointer:

The example handles the grid's PaintEx event to draw a border. The PaintEx event allows you to use DirectX-compatible APIs (e.Cache):

private void GridControl_PaintEx(object sender, DevExpress.XtraGrid.PaintExEventArgs e) {
    DrawHotTrackedCell(e.Cache);
}

private void DrawHotTrackedCell(GraphicsCache cache) {
    Rectangle bounds = GetCellBounds(HotTrackedCell);
    cache.DrawRectangle(new Pen(Brushes.Black, _BorderWidth), bounds);
}

Files to Review

• Form1.cs (VB: Form1.vb)
• Program.cs (VB: Program.vb)

Documentation

• DirectX Hardware Acceleration