There are two DoubleClick events for a cell CellDoubleClick, which you have already used, and CellContentDoubleClick. The DataGridView is very fussy about exactly where you click. If you double-click on the displayed value but are only handling the CellDoubleClick event, nothing happens. Conversely, if you double-click in the cell, but not on the displayed value and you are only handling the CellContentDoubleClick event, nothing happens then either. Set up a handler method for both:
private void dataGridView1\_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
{
MessageBox.Show("Content DoubleClick");
}
private void dataGridView1\_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
MessageBox.Show("Cell DoubleClick");
}
and experiment with the placement of your double-clicks.
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