You have to know
where on the Panel you wish to put your run-time created Buttons, and, depending on where you want to place them, you may need to utilize the dimensions of the Buttons.
For example:
panel1.Controls.Add(delbtn);
panel1.Controls.Add(editbtn);
delbtn.Location = new Point(20,10);
editbtn.Location = new Point(delbtn.Right + 8, delBtn.Height);