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Editorial Team
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Asked: 2026-05-26T21:32:37+00:00

I am working with a DataGridView in winforms that I am handling the CellPainting

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I am working with a DataGridView in winforms that I am handling the CellPainting event for to paint all the cells myself.

My grid is virtual and has all of it’s data stored in a custom data structure centered around a MemoryStream.

All of my painting has been going fine, until a user Shift + clicks to select a large range of cells at once (25,000+), which have to be added to a selected cells collection, have a bunch of flags set, and other performance-draining operations.

Is there any way to prevent the DataGridView from “selecting” a cell so I can handle this operation separately in a more efficient manner?

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1 Answer

  1. Editorial Team

    A bit confused on the issue here.

    If you don’t want them to be able to select multiple-cells at all, set 

    dataGridView.MultiSelect = false

    You say they ctrl+click 25k cells – are you suggesting they select 25k cells one-at-a-time (that is how ctrl+click works)? If you mean they shift-click to select a range, then simply handle the SelectionChanged event, and do whatever you need to do with dataGridView.SelectedRows. SelectionChanged will only be called once, for the entire selection.

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