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' property of Required Field Validator to the ID property of my textbox, but it seems that the validator is unable to find this textbox. Note: using Unique ID for creation of ID is used to prevent collisions in case of multiple use of my control. ) I manually initialize and add controls to the collection and can then find them, but not using Find Control method (this, unfortunately, means that field validator is not able to do the same).Here is simplified code of what I'm trying to do (fields and properties that are not currently in use are omitted): method can't find my textbox control in On Init method. However, I moved adding controls to On Load handler - the error remains.

The following table summarizes the commonly used syntax constructs for regular expressions: The Custom Validator control allows writing application specific custom validation routines for both the client side and the server side validation.The client side validation is accomplished through the Client Validation Function property.The client side validation routine should be written in a scripting language, such as Java Script or VBScript, which the browser can understand.Regular Expression Validator Control A regular expression is a powerful pattern matching language that can be used to identify simple and complex characters sequence that would otherwise require writing code to perform.Using Regular Expression Validator server control, you can check a user's input based on a pattern that you define using a regular expression. These expressions can be phone number, email address, zip code and many more. Simply set the Validation Expression property to any type of expression you want and it will validate it.

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