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Public Class frmTrans Function DtoY(ByRef L As Double, ByRef M As Double, ByRef N As Double) As Double 

Return Math.Round(L * M / (L + M + N), 4) 'delta to wye End Function Function YtoD(ByRef L As Double, ByRef M As Double, ByRef N As Double) As Double 

Return Math.Round((L * M) + (M * N) + (N * L) / (L), 4) 'wye to delta 

End Function Sub labelchanger(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 

_rdbDelta.CheckedChanged, rdbWye.CheckedChanged, btnReset.Click

If sender Is rdbDelta Then 

Call change("R1", "R2", "R3", "Ra", "Rb", "Rc")ElseIf sender Is rdbWye Then 

Call change("Ra", "Rb", "Rc", "R1", "R2", "R3")

End If 

End Sub 

Sub change(ByRef In1 As String, ByRef In2 As String, ByVal In3 As String, ByVal Out1As String, ByVal Out2 As String, ByVal Out3 As String)

lblIn_1.Text = In1lblIn_2.Text = In2

lblIn_3.Text = In3

lblOut_1.Text = Out1lblOut_2.Text = Out2

lblOut_3.Text = Out3End Sub 

Private Sub btnCompute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompute.ClickIf rdbDelta.Checked Xor rdbWye.Checked Then 

Try 

If txtin_1.Text > 0 And txtin_2.Text > 0 And txtin_3.Text > 0 Then Dim R1 As Double = txtin_1.TextDim R2 As Double = txtin_2.TextDim R3 As Double = txtin_3.Text

If rdbDelta.Checked Then 

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  txtout_1.Text = DtoY(R1, R2, R3)txtout_2.Text = DtoY(R2, R3, R1)txtout_3.Text = DtoY(R3, R1, R2)

ElseIf rdbWye.Checked Then txtout_1.Text = YtoD(R1, R2, R3)txtout_2.Text = YtoD(R2, R3, R2)txtout_3.Text = YtoD(R3, R2, R1)

End If ElseIf txtin_1.Text <= 0 Then 

MsgBox("Please enter values greater than zero ONLY!", vbOK +vbExclamation, "Input Error!")

txtin_1.Clear()txtin_1.Focus()

ElseIf txtin_2.Text <= 0 Then MsgBox("Please enter values greater than zero ONLY!", vbOK +

vbExclamation, "Input Error!")

txtin_2.Clear()txtin_2.Focus()

ElseIf txtin_3.Text <= 0 Then MsgBox("Please enter values greater than zero ONLY!", vbOK +

vbExclamation, "Input Error!")txtin_3.Clear()txtin_3.Focus()

ElseIf txtin_1.Text <= 0 And txtin_2.Text <= 0 And txtin_3.Text <= 0 Then MsgBox("Please enter values greater than zero ONLY!", vbOK +

vbExclamation, "Input Error!")

txtin_1.Clear()txtin_2.Clear()txtin_3.Clear()txtin_1.Focus()

End If Catch Overflow As OverflowException 

MsgBox("Overflow Exception has occured! Please check input values", vbOK

+ vbCritical, "Error!")

Catch InvalidCast As InvalidCastException MsgBox("Please enter numeric values only!", vbOK + vbCritical, "Error!")

Catch ex As Exception 

MsgBox(ex.Message, vbOK + vbCritical, "Error!")End Try 

Else 

MsgBox("Please select a transformation mode.", vbOK + vbCritical, "SelectionError")

End If 

End Sub 

Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As 

System.EventArgs) Handles btnReset.Click

txtin_1.Clear()txtin_2.Clear()txtin_3.Clear()

txtout_1.Clear()txtout_2.Clear()txtout_3.Clear()

rdbDelta.Checked = False rdbWye.Checked = False txtin_1.Focus()lblIn_1.Text = "" 

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  lblIn_2.Text = "" lblIn_3.Text = "" lblOut_1.Text = "" lblOut_2.Text = "" lblOut_3.Text = "" 

End Sub 

Private Sub frmTrans_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing

Dim intresponse As Integer = MsgBox("Are you sure to quit?", vbYesNoCancel +vbQuestion, "Quit")

If intresponse = vbYes Then e.Cancel = False 

Else e.Cancel = True 

End If 

End Sub 

Sub NoAlphabet(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles _

txtin_1.KeyPress, txtin_2.KeyPress, txtin_3.KeyPress

If sender Is txtin_1 Or sender Is txtin_2 Or sender Is txtin_3 Then 

If AscW(e.KeyChar) > 45 And AscW(e.KeyChar) < 58 Or AscW(e.KeyChar) = 8 Then Else 

e.KeyChar = Nothing 

End If End If 

End Sub 

Sub ColorChanger(ByVal sender As Object, ByVal e As System.EventArgs) Handles _btnCompute.MouseHover, btnReset.MouseHover, lblIn_1.MouseHover,

txtin_1.MouseHover, Me.MouseHover

If sender Is btnCompute Then 

btnCompute.BackColor = Color.AliceBluebtnReset.BackColor = Color.BlanchedAlmond

ElseIf sender Is btnReset Then 

btnReset.BackColor = Color.AliceBluebtnCompute.BackColor = Color.BlanchedAlmond

ElseIf sender Is lblIn_1 Then lblIn_1.BackColor = Color.Aqua

lblIn_2.BackColor = Color.ChartreuselblIn_3.BackColor = Color.Gainsboro

ElseIf sender Is txtin_1 Then 

txtin_1.BackColor = Color.Red

txtin_2.BackColor = Color.Orangetxtin_3.BackColor = Color.Yellowtxtout_1.BackColor = Color.Green

txtout_2.BackColor = Color.Bluetxtout_3.BackColor = Color.IndigoMe.BackColor = Color.Violet

ElseIf sender Is Me Then Me.BackColor = Color.LightGoldenrodYellowrdbDelta.BackColor = Color.LightSeaGreenrdbWye.BackColor = Color.LightSkyBlue

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  End If End Sub Sub ColorDefault(ByVal sender As Object, ByVal e As System.EventArgs) Handles _

btnCompute.MouseLeave, btnReset.MouseLeave, lblIn_1.MouseLeave,txtin_1.MouseLeave, Me.MouseLeave

If sender Is btnCompute Then btnCompute.BackColor = Color.Empty

btnReset.BackColor = Color.EmptyElseIf sender Is btnReset Then 

btnReset.BackColor = Color.EmptybtnCompute.BackColor = Color.Empty

ElseIf sender Is lblIn_1 Then lblIn_1.BackColor = Color.Empty

lblIn_2.BackColor = Color.EmptylblIn_3.BackColor = Color.Empty

ElseIf sender Is txtin_1 Then 

txtin_1.BackColor = Color.Emptytxtin_2.BackColor = Color.Emptytxtin_3.BackColor = Color.Emptytxtout_1.BackColor = Color.Emptytxtout_2.BackColor = Color.Emptytxtout_3.BackColor = Color.EmptyMe.BackColor = Color.Empty

ElseIf sender Is Me Then Me.BackColor = Color.WhiterdbDelta.BackColor = Color.Empty

rdbWye.BackColor = Color.EmptyEnd If 

End Sub 

End Class