https://www.syncfusion.com/forums/30753/tooltiptext-for-gridcontrol
ToolTipText for GridControl | WinForms | GridControl | Syncfusion
Forum Thread - GridControl - ToolTipText for GridControl. Browse other users' questions about our WinForms GridControl components.
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https://learn.microsoft.com/ja-jp/dotnet/api/system.windows.forms.datagridviewcell.tooltiptext?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-6.0
DataGridViewCell.ToolTipText Property (System.Windows.Forms) | Microsoft Learn
Gets or sets the ToolTip text associated with this cell.
property systemwindows formsmicrosoftlearn