validation textbox

Hi All.
I validate TextBox for numeric and legth no more then 7 characters. I'm checking for Not IsNumber and Len. But I want to give a user to save record when TextBox is blank. If is it possible how to do it?
Thanks.

Hey,

I am not sure that I fully understand the question?!?

Can you provide more details, plus the code you are already using?

Gary

Code:

---

Dim BogusDec As Decimal
If (TextBox.Text.Trim.Length = 0I OrElse TextBox.Text.Trim.Length = 7I) AndAlso Decimal.TryParse(TextBox.Text.Trim, BogusDec) Then
  'Good to go
End If

---

Hey,

If that is what the OP is trying to do, then I would be tempted to implement this as a Regular Expression check:

http://www.java2s.com/Tutorial/CShar...oraTextBox.htm

Hope that helps!!

Gary

Not Sure but do you have something like this in vb.net?

vb Code:

Dim BogusDec As Decimal
If TextBox.Text.Trim.Length < 8I AndAlso Decimal.TryParse(TextBox.Text.Trim, BogusDec) Then
  'Good to go
End If

Regex is kind of over kill for this simple validation.
Set the textbox.MaxLength = 7 and handle the textbox.validating event. In the event handler, just test if the text is not blank and do a tryparse to make sure it's a valid number.

Quote:

---

Originally Posted by koolsid

Not Sure but do you have something like this in vb.net?

vb Code:

Dim BogusDec As Decimal
If TextBox.Text.Trim.Length < 8I AndAlso Decimal.TryParse(TextBox.Text.Trim, BogusDec) Then
  'Good to go
End If

---

You don't need to declare that variable if you won't be using it. You can simply pass Nothing for it.

vb.net Code:

If TextBox.Text.Trim.Length < 8 AndAlso Decimal.TryParse(TextBox.Text.Trim, Nothing) Then
  'Good to go
End If

[/QUOTE]

Quote:

---

Originally Posted by Pradeep1210

You don't need to declare that variable if you won't be using it. You can simply pass Nothing for it.

vb.net Code:

If TextBox.Text.Trim.Length < 8 AndAlso Decimal.TryParse(TextBox.Text.Trim, Nothing) Then
  'Good to go
End If

---

Didn't know that one, I thought it had to be an actual variable whether you use it or not. It would be nice if the String class had a .IsNumber function like the Char class does.

How about creating an Extension method?

http://dotnetbyexample.blogspot.com/...n-methods.html

Gary

Its easy to create extension methods.

e.g.

vb.net Code:

Public Module MyExtensionMethods
    <Extension()> _
    Public Function IsNumber(ByVal input As String) As Boolean
        Return Decimal.TryParse(input, Nothing)
    End Function
End Module

So now you use it just like any other method of the String class:
e.g.

vb.net Code:

Dim myString as String = "12345"
MessageBox.Show(myString.IsNumber)

Quote:

---

Didn't know that one, I thought it had to be an actual variable whether you use it or not. It would be nice if the String class had a .IsNumber function like the Char class does.

---

I guess it would be nice, but you can just use the IsNumeric function instead

Quote:

---

Originally Posted by chris128

I guess it would be nice, but you can just use the IsNumeric function instead

---

The IsNumeric function is good for ordinary use. But it usually won't give the results you would expect. It actually tries anything that can be possible as a number. e.g. hex numbers, commas etc. which you might not expect in normal ways.

e.g.

vb.net Code:

Decimal.TryParse("&H10A", Nothing)          '<-- Returns False
IsNumeric("&H10A")                          '<-- Returns True

Oh right, I never knew that, thanks :)