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Regular Expressions to find a valuie in a richtextbox like in notepad or in any other application. In some cases I want to restricted that my textbox accept only specific input which we want.A Text Box control is used to display, or accept as input, a single line of text.

Also, the more tests you are performing, the slower your app might become. For more information regarding Regular Expressions, you are welcome to look at these two MSDN articles: Because it is always easy to learn by doing things practically, you will be creating an app that makes use of Regular Expressions to determine valid input. NET application and design the form to resemble Figure 1. Obviously this only works for the formatting of the email. Handled = True End If End Sub Private Sub Text Box1_Text Changed(By Val sender As System. Text = "" End If End Sub End Class Text Box control has additional functionality that is not found in the standard Windows text box control, including multiline editing and password character masking. Text Box Control The properties like Auto Complete Custom Source, Auto Complete Mode and Auto Complete Source to perform a Text Box that automatically completes user input strings by comparing the prefix letters being entered to the prefixes of all strings in a data source. However, control never enters the "if" block in the below use case: 1. (which means error Provider1 will have "Password invalid! (which means error Provider1 will have null (or) be null - I don't exactly understand) I know this is because of something I'm missing to understand using "null".

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