How to Open Drop down (combo items) of Combo Box on KeyDown Event?

Question

Scenario : I am working on project where my client needs to open the drop down(combo items) of combo box on f1 key down , but i am achieving it my try multiple codes. how can i open combo box items on any key event. Here is my code

private void dgvItemLists_KeyDown(object sender, KeyEventArgs e)
        {

            try
            {
                if (e.KeyCode == Keys.Subtract)
                {
                    txtDiscount.Focus();
                }

                if (e.KeyCode == Keys.Add)
                {
                    mtxtQty.Focus();
                }

                if (e.KeyCode == Keys.F1)
                {
                   cmbAreaName.Focus();
                //  cmbAreaName.AllowDrop = true;
               //   cmbAreaName.Show();
                  cmbAreaName_Click(this, new System.EventArgs());
                  //cmbAreaName_DrawItem(this, new DrawItemEventArgs);

                 // cmbAreaName.SelectedIndexChanged=;
                }

}

required result image is given.

any suggestions or recommendations of code will be highly appreciated.

Answer 1

Currently, you're just executing the code inside the Click event when you call cmbAreaName_Click .

If you want to show the dropdown, set the DroppedDown property to true :

cmbAreaName.DroppedDown = true;

Answer 2

Try

if (e.KeyCode == Keys.F1)
{
    cmbAreaName.DroppedDown = true;
}

Maybe you should put this in a method so you can raise it on events you need.