A^2+b*+c=0

I need to present a work until tomorrow in Visual beginner's
all-purpose symbolic instruction code.Net, that it consists of deciding the equation of 2º Degree A*^2 + B* + C =0
The environment goes to have 3 boxes of text a button and one label, each box of text corresponds to A B C of formulates, and label goes to present the result or the two results if the result
will be greater that 0.

But I need to make this on the basis of everything functions, the button to calculate goes to have very little code.

Please help me, that is very important for me, and I do not perceive very of Mathematics.

I go to leave in annex a little of the project to see as it will be the
graphical environment, and the little that I obtained to make.

VB Code:

Private Sub calc_btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles calc_btn.Click
    resultado_lbl.Text = descriminante(CInt(a_txt.Text), CInt(b_txt.Text), CInt(c_txt.Text))
End Sub
 
Public Function descriminante(ByVal a As Integer, ByVal b As Integer, ByVal c As Integer) As Double
    Return Math.Sqrt((b * b) - 4 * a * c)
End Function

I noticed your code sample was entitled "WindowsApplication15". You really need to start naming your programs properly. Read a few books on VB.net and take note of the coding conventions. A book is easily the best way to pick up a language like VB, its much harder doing it only via the internet.