C textbox validating event


01-Apr-2019 13:34

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I want to check what the user is writing in a textbox before I save it in a database. I guess I can always write some ifs or some try-catch blocks, but I was wondering if there's a better method.

I've read something about Validating Events, but I am not sure how can I use them. Validating Event When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.

However, if the user starts to type the path, then decides to browse instead (a likely scenario), the Validate event gets fired on the incompletely typed path in the textbox (before the Browse button's Click event, too, obviously).

I can't just 'ignore' an invalid path in the Validate event, either, as I need to verify the paths users type or browse for.

I have some code that checks and makes sure that when the users enters in the field an integer from 1 - 10 has to be input.

Although if the users takes focus of the field, the "bad" data (such as "fdgfdg") is still left in the field.

C# Text Box Properties You can set Text Box properties through Property window or through program.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. C# Autocomplete Text Box From the following C# source code you can see some important property settings to a Text Box control.Se l'indirizzo di posta elettronica non è nel formato standard ([email protected]" and "contiene "."), la convalida ha Error Provider esito negativo, viene visualizzata un'icona e l'evento viene annullato.private: void text Box1_Validating( Object^ sender, System:: Component Model:: Cancel Event Args^ e ) void text Box1_Validated( Object^ sender, System:: Event Args^ e ) public: bool Valid Email Address( String^ email Address, [Out]interior_ptrprivate void text Box1_Validating(object sender, System. Cancel Event Args e) private void text Box1_Validated(object sender, System. Length = 0 Then error Message = "Email address is required." Return False End If ' Confirm that there is an "@" and a "." in the email address, and in the correct order. Cr _ "For example '[email protected]' " Return False End Function Private Sub text Box1_Validating(By Val sender As Object, _ By Val e As System. Text, error Msg) Then ' Cancel the event and select the text to be corrected by the user. You can open Properties window by pressing F4 or right click on a control and select Properties menu item.

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The below code set a textbox width as 250 and height as 50 through source code.

Active Control proprietà sul form corrente, gli eventi di attivazione si verificano nell'ordine seguente: When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.