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Asked: 2026-05-11T05:56:27+00:00

I need to apply formatting – specifically, bold text – to the tooltip used

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I need to apply formatting – specifically, bold text – to the tooltip used by a DataGridView in virtual mode. I can set the text in the CellToolTipTextNeeded event, but it doesn’t support HTML tags; is there some other syntax I should be using? I don’t want to have to reimplement tooltip support myself.

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  1. You can use the HtmlToolTip from http://www.codeproject.com/KB/GDI-plus/HtmlRenderer.aspx

    To use it with DataGridView create a ToolTip (HtmlToolTip) and add this after the InitalizeComponent() in your form to replace the default tooltip:  System.Reflection.FieldInfo toolTipControlFieldInfo= typeof(DataGridView).GetField('toolTipControl', System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);  System.Reflection.FieldInfo toolTipFieldInfo= toolTipControlFieldInfo.FieldType.GetField('toolTip', System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);  object toolTipControlInstance = toolTipControlFieldInfo.GetValue(myDataGridView);  toolTipFieldInfo.SetValue(toolTipControlInstance, myToolTip);

    Work for me with .net 3.5

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