how to call a function for validating a textbox?

Question

hi

i have this function to validate my textbox (the code below), but how am i going to call this function. 

the result i want is when i key in the textbox and the value in the textbox doesnt match, it show prompt a message on a label beside the textbox, unless the value change to the correct one then the user can click on the button

the question is where should i call the function in the aspx.vb and how?

Public Function vldEmail(ByVal emlAddress As String) As Boolean
‘create Regular Expression Match pattern object
Dim myRegex As New Regex("^([a-zA-Z0-9_\-\.]+)@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$")
‘boolean variable to hold the status
Dim isValid As Boolean = False
If emlAddress = "" Then
isValid = False
Else
isValid = myRegex.IsMatch(emlAddress)
End If
‘return the results
Return isValid
End Function

Answer 1

Will the RegularExpressionValidater control work for you?

http://msdn.microsoft.com/en-us/library/eahwtc9e.aspx

 

Answer 2

Will the RegularExpressionValidater control work for you?

http://msdn.microsoft.com/en-us/library/eahwtc9e.aspx

 

yes this work, but if  code a function for the textbox validation from aspx.vb like what you see at above, how am i goin to call to achieve similar result as regular expression validator?

Answer 3

You can use the Validating Event to handle the validation:

http://msdn.microsoft.com/en-us/library/system.windows.forms.control.validating.aspx

 

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Paul ~~~~ Microsoft MVP (Visual Basic)

Answer 4

You can use the Validating Event to handle the validation:

http://msdn.microsoft.com/en-us/library/system.windows.forms.control.validating.aspx

 

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Paul ~~~~ Microsoft MVP (Visual Basic)

i do aspx which is website not a form, if it is a form i can directly use textbox_validating and put the code inside, that why i not sure how to put those code in aspx.vb

Answer 5

Sorry, I didn't notice that you were using ASP.NET. Since the behavior is different in Windows Forms, I would recommend posting to the ASP.NET forum:

http://forums.asp.net/

 

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Paul ~~~~ Microsoft MVP (Visual Basic)