DataGridView ToolTipText not showing

I have data bound DataGridView in a desktop app with columns that have their ToolTipText property set, yet no tool tip is displayed when I hover over grid view (cells or cell headers).

The ShowCellToolTips property of the grid view is true, and I have verified using break points that it is not changed programmatically before I mouse over.

I have tried creating a CellToolTipTextNeeded event handler to see what the tool tip text was, but the event handler is never called.

Is there anything I have missed?

Thanks, Rob

Edit: We're using framework 2.0.


It appears from your question that you set the tooltip text of the columns. Columns tooltip text only appears when floating over the headers. To show tooltip text on the cells you have to hookup the CellToolTipTextNeeded event and set the value of e.ToolTipText in the event args

Add ToolTips to Individual Cells in DataGridView Control, You can override this behavior, however, to set ToolTip-text values for individual cells. This is useful to display to users additional information  In fact, you will need to disable it so set your DataGridView's ShowCellToolTips property to false (it's true by default). You can use the DataGridView's CellEnter event with a regular Winform ToolTip control to display tool tips as the focus changes from cell to cell regardless of whether this was done with the mouse or the arrow keys.


Try using Cell.ToolTipText property. You will probably need to loop the rows of the DataGridView and set the tooltips manually:

 For Each row As DataGridViewRow In Me.DataGridView.Rows
   Me.DataGridView("MyCol", row.Index).ToolTipText = "MyToolTipText"
 Next

Might not be suitable for a bound DataGridView with lots of rows but works successfully for me with an unbound DataGridView with a couple of hundred rows. Hope this helps.

DataGridViewCell.ToolTipText Property (System.Windows.Forms , I have quite a busy datagridview and I want to display data in a tooltip when Thinking about it, I'm not too sure how tool tips are supposed to work, is there any ?You could also use the CellEnter event to set the tooltip text. Investigation on MSDN at the time indicated that the event would not be triggered when the mouse did not move. This certainly appears to be incorrect for the DataGridView. We did not notice this issue on any other controls, but we did not do exhaustive testing..Net 3.5 Client Profile, C# WinForms app


When I added a datagridview with a single (empty) column to a form, added text to the ToolTipText property for that column, and ensured that the ShowCellToolTips property for the datagridview is set to True, I do get a tooltip popup when I hover my mouse over that column's header. This seems to contradict what was stated in the original question, but in my test the grid was not data bound. Not sure if that makes a difference. However, on a project with a data bound datagridview, I just used a ToolTip component:

(1) Add a ToolTip component to your form. (2) Set the ToolTip on toolTip1 (or equivalent name for your ToolTip component) property for your datagridview to whatever text you want to display. (3) Set your datagridview's ShowCellToolTips property to False. (4) Viola! Works as expected.

VS 2010 Having problems with datagridview cell tooltips.-VBForums, Examples. The following code example shows how to set the ToolTipText property within an event handler for the CellFormatting event. This example is part of a larger code example provided in How to: Add ToolTips to Individual Cells in a Windows Forms DataGridView Control.


I had a simular problem but was able to correct it by setting the ShowCellToolTip to true on my DataGridView. Once I did that I was able to send the following code and everything worked fine.

tableDocTypes.ShowCellToolTips = true;
tableDocTypes.Rows[i].Cells[columnFormCabinet.Index].ToolTipText = "Cabinet is not defined on the optical server.";

Private Sub ToolTips() Dim firstColumn As DataGridViewColumn = _ dataGridView.Columns(0) Dim thirdColumn As DataGridViewColumn = _ dataGridView.Columns(2) firstColumn.ToolTipText = _ "This is column uses a default cell." thirdColumn.ToolTipText = _ "This is column uses a template cell."


To show the tooltip of the grid cell, you can use this event handler "CellToolTipTextNeeded". Refer the below code Snippet,

this.dataGridView1.ShowCellToolTips = true;
this.dataGridView1.CellToolTipTextNeeded += dataGridView1_CellToolTipTextNeeded;

void dataGridView1_CellToolTipTextNeeded(object sender, DataGridViewCellToolTipTextNeededEventArgs e)
{
    if (e.ColumnIndex >= 0 && e.RowIndex >= 0)           
    {
        e.ToolTipText = this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
    }
}

Hi Amit Thanks for the reply. Yes I want to check the value in the column named 'EditKey'. If there is a value in that cell for column 'EditKey' I want to change the color of the row and then assign a ToolTip for the entire row.


How to: Add ToolTips to Individual Cells in a Windows Forms DataGridView Control. 03/30/2017; 2 minutes to read +6; In this article. By default, ToolTips are used to display the values of DataGridView cells that are too small to show their entire contents. You can override this behavior, however, to set ToolTip-text values for individual cells.


it is another subject but just keep this function when you are using mdi parent Private Function IsOpen(ByVal nameForm As String) As Boolean Dim childfrm As Form Dim strName As String Dim intLastIndex As Integer For Each childfrm In Me.MdiChildren strName = childfrm.GetType.ToString intLastIndex = strName.LastIndexOf(".") strName = Mid(strName, intLastIndex + 2, Len(strName) - intLastIndex) If


I did say not to use the DataGridView as the window for the tooltip. Not sure why, but using DataGridView blocks the tooltip from showing. The easiest way to make sure your X and Y are the same is to full dock the DataGridView in a panel or other container and use the container as the window reference for the tooltip.