Vb code for validating textbox
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.Focus() exit sub End If Next End If The event handler starts with the declaration of a local character array variable called statement.
The same is true for the user's date of birth (DOB) and the CAPTCHA sum (which as you will see, can never exceed two digits).The validation rules used will depend on the application, and in particular on the type of data being input to the program.Database management systems like Oracle or Microsoft Access provide extensive facilities for creating data validation rules. Please enter something", msgboxstyle.okonly) Textbox1. Focus() Endif End Sub I have to write the same line of code for each textbox to check if it is not empty and was thinking of using a function that will be called and check each textbox in my form. Thanks This post has been edited by modi123_1: 22 February 2011 - AM For Each control As Control In group Box2.Controls ' Loops through array of controls If Type Of control Is Text Box Then ' If type is textbox Dim txt As Text Box = Try Cast(control, Text Box) ' Convert Control to textbox If String. 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.If this occurs, the event handler will display a message to tell the user that the telephone number entered is invalid, restore the focus to the Telephone field, and exit the subroutine.Run the program and test the code by entering an invalid telephone number.Although not explicitly stated below, you should also impose appropriate limits on the input length for the remaining fields.The password fields are a good example of a situation where you can reduce the requirements for data validation by imposing such a limit.