c# - Event that fires during DataGridViewComboBoxColumn SelectedIndexChanged

Question

I have DataGridView with two columns. The first column is TextBoxCol(DataGridViewTextBoxColumn) and the Second one is ComboBoxCol(DataGridViewComboBoxColumn).

How can I change the value of TextBoxCol when ComboBoxCol changes its selected index value? (This should happen when selected index changed in ComboBoxCol. Not after leaving the column, like dataGridView_CellValueChanged)

I have read one topic with almost the same problem that I am having but I dont understand the answer(which should be correct base on the check mark). Here's the link. -Almost same topic

Answer 1

This answer is floating around in a couple of places.

Using the DataGridViewEditingControlShowingEventHandler will fire more events than you intend. In my testing it fired the event multiple times.

Also using the combo.SelectedIndexChanged -= event will not really remove the event, they just keep stacking.

Anyway, I found a solution that seems to work. I'm including a code sample below:

// Add the events to listen for
dataGridView1.CellValueChanged += new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);
dataGridView1.CurrentCellDirtyStateChanged += new EventHandler(dataGridView1_CurrentCellDirtyStateChanged);



// This event handler manually raises the CellValueChanged event 
// by calling the CommitEdit method. 
void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
    if (dataGridView1.IsCurrentCellDirty)
    {
        // This fires the cell value changed handler below
        dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
    }
}

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    // My combobox column is the second one so I hard coded a 1, flavor to taste
    DataGridViewComboBoxCell cb = (DataGridViewComboBoxCell)dataGridView1.Rows[e.RowIndex].Cells[1];
    if (cb.Value != null)
    {
         // do stuff
         dataGridView1.Invalidate();
    }
}