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ASP.NET client-side validation against a dynamically loaded list

, 18 Sep 2010
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Use RegularExpressionValidator to validate user input against a dynamic list of values.
If you need to validate some user input against a set of allowed values, you can use the RegularExpressionValidator by setting its ValidationExpression as follows:
 
EUR|USD|AUD|CHF
 
The '|' symbol delimits the set of allowed values in a regular expression.
 
If you need to load the list of allowed values from a database, config file or other source, you can do so, and simply set the ValidationExpression property of the RegularExpressionValidator at runtime.
 
Dim currencyDAL As New CurrencyDAL()
Dim currencies As List(Of String) = currencyDAL.SelectAll()
Dim expression As String = String.Join("|", currencies.ToArray)
currencyValidator.ValidationExpression = expression
 
Simple.

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