How Can I Get The Correct Output

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.NET

Visual-Studio

I am currently working a calculator that uses this algorithm: shunting yard in visual basic, i have already converted the infix expression to a postfix expression, but when i execute it , it does absolutely nothing, i cant find the error ....help would be very appreciated,thanks in advance. salida is a queue with the postfix expression that i pass to the sub...

If queueAux.Count > 0 Then
            For Each c As Char In queueAux
                If Char.IsDigit(c) Then
                    stackAux.Push(c) 
                Else
                    a = Convert.ToDouble(stackAux.Pop + "")
                    b = Convert.ToDouble(stackAux.Pop + "")
                    op = salida.Dequeue()
                    If op.Equals("+") Then
                        res = a + b
                        resConv = Convert.ToChar(res)
                        stackAux.Push(resConv)
                    End If
                End If
            Next
        Else
            If stackAux.Count = 1 Then
                Console.WriteLine("The result is " + stackAux.Peek)
            End If
        End If
    End Sub