VB-45 : Calculate Electricity Bill

Design a VB application to calculate the Electricity Bill by taking the Consumer Name,Consumer No, Number of units by taking the details below into consideration.

• 0 to 100 units      : Rs. 0.50 per unit
• 101 to 200 units  : Rs. 0.85 per unit
• 201 to 300 units  : Rs. 1.00 per unit
• 301 and above    : Rs. 1.25 per unit

A)    Program Design : 

(B) Property(Controls Used) :

1.  5 Labels with Captions as shown above
2. 4 Text Boxes and given are their properties : 

• The Text Property of text boxes for entering Consumer Number,units consumed and total amount should be kept as Zero and the text box for entering consumer name should be kept as blank
• The Index Property of the four text boxes should be from 0 to 3 respectively
• The Locked Property of the 4th text box (For calculating total amount) should be kept as True

    3.   One command button with caption Calculate Bill

(C) Attaching Code to the Object :

Private Sub Command1_Click() Dim sum As Single Dim unit As Integer If Text1.Text = "" Or Text2.Text = "" Then MsgBox "Enter Consumer Number and Name" End If unit = Round(Val(Text3.Text)) If unit > 300 Then sum = (unit - 300) * 1.25 unit = 300 End If If unit > 200 Then sum = sum + (unit - 200) * 1 unit = 200 End If If unit > 100 Then sum = sum + (unit - 100) * 0.85 unit = 100 End If sum = sum + unit * 0.5 Text4.Text = sum End Sub

Private Sub Text1_KeyPress(Index As Integer, KeyAscii As Integer) If (Index = 0 Or Index > 1) And (KeyAscii < 48 Or KeyAscii > 57) Then SendKeys (Char(8)) End If End Sub

Possible Error  : Sub or Function Not Defined

Refer Electricity Bill also.

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