Vb net combobox validating event
Even so, we can think in general terms about the kind of data validation required for a typical application, and how it might be implemented.
Some common data validation requirements are outlined below.
Note also that the two password text boxes should have their event, which will check the form data for validity before sending it to the (in this case imaginary) server application.
Database management systems like Oracle or Microsoft Access provide extensive facilities for creating data validation rules.
There are many ways in which validation can be carried out, and it is down to analysts and software developers to decide what kind of validation is required and how to implement it.
To demonstrate some simple validation techniques, we will create a data entry form of the type typically found on a web page.
Text, "@") function) of the first occurrence (if any) of the at sign ("@") character in the string, and the location of the first occurrence thereafter (if any) of the period (".") character.
Note that the first argument to the function specifies at what position within the target string the search starts, so any occurrence of a period before the "@" is ignored.