Do as follows in your Form’s constructor after setting the StartPosition to Manual:
[C#]
this.SetBounds(Screen.GetWorkingArea(this).Width-this.Width
,Screen.GetWorkingArea(this).Height-this.Height , this.Width, this.Height);
[VB.Net]
Me.SetBounds(Screen.GetWorkingArea(Me).Width-Me.Width
,Screen.GetWorkingArea(Me).Height-Me.Height , Me.Width, Me.Height)