Two Numbers After Decimal Point !

[Thasarath]

Hi, I need to make 5 as 5.00 , .5 as 0.50 , etc.
I tried

Textbox1.Text = Math.Round (Textbox1.Text,1)

And

Textbox1.Text = Format(Textbox1.text.Tostring,"#.##")

But Not Working Help Please !