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help on error message

Posted on 2008-10-02
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Last Modified: 2010-04-21
i got this code that when i get to put a value in room service the whole thing stop working and tell me Conversion from string "" to type 'Double' is not valid."}. my code is suppose to calculate subtotal which is telephoneChg + RoomService + Laundry my code is the follow please help
If TextBox4.Text.Length = 0 AndAlso TextBox5.Text.Length = 0 AndAlso TextBox6.Text.Length Then Exit Sub
If Not IsNumeric(TextBox4.Text) OrElse Not IsNumeric(TextBox5.Text) AndAlso TextBox6.Text.Length Then Exit Sub
 
        dblRoomService = CDbl(TextBox5.Text)
        dblTelephone = CDbl(TextBox4.Text)
        dblLaundry = CDbl(TextBox6.Text)
        Subtotal = dblRoomService + dblTelephone + dblLaundry
        TextBox7.Text = CStr(Subtotal)
        TextBox7.Text = Format(Subtotal, "$#,##0.00")
    End Sub

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Question by:elrayiss
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Arthur_Wood earned 400 total points
ID: 22628330
you missed a value at the end of the first line:

If TextBox4.Text.Length = 0 AndAlso TextBox5.Text.Length = 0 AndAlso TextBox6.Text.Length Then Exit Sub
If Not IsNumeric(TextBox4.Text) OrElse Not IsNumeric(TextBox5.Text) AndAlso TextBox6.Text.Length Then Exit Sub
 

should read
If TextBox4.Text.Length = 0 AndAlso TextBox5.Text.Length = 0 AndAlso TextBox6.Text.Length = 0 Then Exit Sub
If Not IsNumeric(TextBox4.Text) OrElse Not IsNumeric(TextBox5.Text) AndAlso TextBox6.Text.Length Then Exit Sub
 
notice the = 0 after TextBox6.Text.Length
 

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by:Arthur_Wood
ID: 22628347
also, the second line should read:
If Not IsNumeric(TextBox4.Text) OrElse Not IsNumeric(TextBox5.Text) OrElse Not IsNumeric(TextBox6.Text) Then Exit Sub
 

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Author Closing Comment

by:elrayiss
ID: 31502485
excellent thank you
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LVL 44

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by:Arthur_Wood
ID: 22645844
Glad to be of assistance.

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