VB.NET

[CrySet]

Ok so iv started learning VB.NET for college *sigh*

Anyway, there are many different things I need to learn, which is all well and good, but I don't have a website to learn from so I can study ahead of everyone else, because they are all currently learning the basic basic basics. (what variables are etc.)

So 1, can you recommend any good VB.NET sites?

Second thing, Iv come across a bit of an annoyance, because the work in class is using user-input. And is basically working with numbers and currency. Anyway, because they only have VB.NET 2005 at college, iv had to come up with this function to work out if the number is an integer/single (0.00)

   Public Function check_int_dec()
       If (valid = True) Then
           For v = 1 To Len(intcheck)
               If (Asc(Mid(intcheck, v, 1)) < 48) Or (Asc(Mid(intcheck, v, 1)) > 57) Then
                   valid = False
                   If Not (v = Len(intcheck)) Then
                       If (Asc(Mid(intcheck, v, 1)) = 46) Then
                           valid = True
                       End If
                   End If
               End If
           Next v
       End If
   End Function


That currently works, but, it is annoying to have to keep calling the function and changing things around, also, if I want to change/add/remove something. I dont want 20 different functions

Is there a simpler way to work out whether a variable is an integer/single? If not, is there anything I can do to that to make it more reliable?

Thanks

[BFD]

Considering that I write software in VB for a living, my idea of a good resource might not be ideal for someone just starting out. However, I have always found MSDN (Microsoft Developer Network) to be the best place to start looking for information on Microsoft development products. They even have a section of the site that might work well for you - msdn.microsoft.com/en-us/beginner/default.aspx

As for you code question, it looks like you are recreating the IsNumeric built in function. There are also methods of the individual datatypes that will work as well (integer.tryparse, single.tryparse, double.tryparse, etc.) If all you need is a function to validate input, any of those will work. If you are writing the function as an exercise, your approach is decent. However, you might want to store the current character (Mid(intcheck, v, 1)) in a variable and use a select case to consider each possible value. This will allow you to more easily add the ability to handle comma's, dollar signs and other characters that might be determined a vailid later on. Also, you will want to avoid single letter variable names, even in for loops (for example, CurrentStringIndex leaves little room for misinterpretation)...while you might have to type more, having meaning to the names will help others to understand your code better.