DataGridViewCellToolTipTextNeededEventArgs Class
Provides data for the CellToolTipTextNeeded event.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
System::EventArgs
System.Windows.Forms::DataGridViewCellEventArgs
System.Windows.Forms::DataGridViewCellToolTipTextNeededEventArgs
| Name | Description | |
|---|---|---|
![]() | ColumnIndex | Gets a value indicating the column index of the cell that the event occurs for.(Inherited from DataGridViewCellEventArgs.) |
![]() | RowIndex | Gets a value indicating the row index of the cell that the event occurs for.(Inherited from DataGridViewCellEventArgs.) |
![]() | ToolTipText | Gets or sets the ToolTip text. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
The CellToolTipTextNeeded event occurs only when the DataGridView control DataSource property is set or its VirtualMode property is true.
When you handle the CellToolTipTextNeeded event, the ToolTip text you specify in the handler is shown whenever the mouse pointer is over a cell and the control ShowCellToolTips property value is true. The CellToolTipTextNeeded event is useful when you want to display ToolTips determined by the current state or value of a cell.
The CellToolTipTextNeeded event also occurs whenever the value of the DataGridViewCell::ToolTipText property is retrieved, either programmatically or when the mouse pointer enters a cell.
You can use the ColumnIndex and RowIndex properties to determine the state or value of a cell, and use this information to set the ToolTipText property. This property is initialized with the value of the cell ToolTipText property, which the event value overrides.
Handle the CellToolTipTextNeeded event when working with large amounts of data to avoid the performance penalties of setting the cell ToolTipText value for multiple cells. For more information, see Best Practices for Scaling the Windows Forms DataGridView Control.
For more information about handling events, see NIB: Consuming Events.
The following code example fills the ToolTipText with information from hidden cells in the DataGridView.
Available since 2.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
DataGridView
DataGridView::CellToolTipTextNeeded
DataGridView::DataSource
DataGridView::VirtualMode
DataGridView::ShowCellToolTips
DataGridView::OnCellToolTipTextNeeded
DataGridViewCellToolTipTextNeededEventHandler
DataGridViewCellToolTipTextNeededEventArgs::ToolTipText
DataGridViewCell::ToolTipText
System.Windows.Forms Namespace
Best Practices for Scaling the Windows Forms DataGridView Control


