To make your user control transparent, Add code described in three steps
Step 1
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00000020;
return cp;
}
}
Step 2
protected override void OnPaintBackground(PaintEventArgs e)
{
// dont code anything here. Leave blank
}
Step 3
protected void InvalidateEx()
{
if (Parent == null)
return;
Rectangle rc = new Rectangle(this.Location, this.Size);
Parent.Invalidate(rc, true);
}
After doing 3 steps, place your user control in the form. Its going to be transparents. The controls placed on user control will be visible.