TouchToolKit provides DataGridViewZoomPolicy to get a better zoom result for DataGridView. It can zoom the Size and Font for all Columns, Rows, or Cells.

If your C1DataGridView control has many rows and you try to change the default value for the rows or cells it may causes a performance problem. To advoid this, you can try to change DataGridViewZoomPolicy.ZoomRowHeight or DataGridViewZoomPolicy.ZoomCellStyleFont property value to False.

If you add new rows to the DataGridView control in code, use the C1Zoom.BeginAddControls and C1Zoom.EndAddControls method.