This document discusses validations and input formatting in applications. It summarizes: 1) Validations check that users enter data in the correct format and provide warning messages if invalid data is entered. Field-level validation checks individual fields while form-level validation checks entire forms. 2) The MaskedEdit control formats user input using a mask and prevents invalid characters. It is bound to data controls to display and update field values. 3) The Mask property of the MaskedEdit control uses placeholder characters to define the type of data that can be entered, such as numbers, letters, dates. These placeholders guide user input.

2. VALIDATIONS AND
INPUT FORMATTING
NEHA KAURAV
SHIVA MISHRA
CLASS:
BCA 3rd SEM.

3. • You must have noticed in many applications that
when you enter something incorrectly or when
you leave the field blank, it warns you with a
message. This is called validation.
More precisely, when you leave the text field
and move to another control, you get a warning
message and the input focus goes back to the
previous field.
In short, validation tells the user to enter valid
data.

4. • The first level of validation is at the field
level. This is the place where you can make
sure the user is entering the right characters
in the field, entering the data into the field in
the proper format, and entering a valid value
based on a list of possible choices.

5. • Form-level validation is an essential part of
designing a good validation scheme for your form.
Although many input errors can be caught and
corrected at the field level, there are several
validation steps that can only be performed well at
the form level.
• Although field-level validation is performed at the
time a key is pressed or at the time a field loses
focus, form-level validation is performed at the
time the user presses Enter, or clicks the OK or Save
button.
• These are validations that are done after the user
has entered all data, but before any attempt is
made to store the values to a data table.

6. • The MaskedEdit control is used to prompt users for
data input using a mask pattern. You can also use it to
prompt for dates, currency, and time, or to convert
input data to all upper- or lowercase letters.
• The input mask prevents users from entering invalid
characters into the control. If the user attempts to
enter a character that conflicts with the input mask,
the control generates a ValidationError event.
• The MaskedEdit control is a bound control and can be
used with a data control to display or update field
values in a data set.

7. • The Mask property determines the type of
information that is input into the MaskedEdit
control. The Mask property uses characters
such as the pound sign (#), backslash (),
comma (,), and ampersand (&) as
placeholders that define the type of input.
The following table lists all the characters you
can use to set the Mask property:

8. Mask
character
Description
# Digit placeholder.
. Decimal placeholder. The actual character used is the one specified as the decimal placeholder in your
international settings. This character is treated as a literal for masking purposes.
, Thousands separator. The actual character used is the one specified as the thousands separator in your
international settings. This character is treated as a literal for masking purposes.
: Time separator. The actual character used is the one specified as the time separator in your international
settings. This character is treated as a literal for masking purposes.
/ Date separator. The actual character used is the one specified as the date separator in your international
settings. This character is treated as a literal for masking purposes.
Treat the next character in the mask string as a literal. This allows you to include the '#', '&', 'A', and '?'
characters in the mask. This character is treated as a literal for masking purposes.
& Character placeholder. Valid values for this placeholder are ANSI characters in the following ranges: 32-126
and 128-255.
> Convert all the characters that follow to uppercase.
< Convert all the characters that follow to lowercase.
A Alphanumeric character placeholder (entry required). For example: a z, A Z, or 0 9.
A Alphanumeric character placeholder (entry optional).
9 Digit placeholder (entry optional). For example: 0 9.
C Character or space placeholder (entry optional).
? Letter placeholder. For example: a z or A Z.
Literal All other symbols are displayed as literals; that is, as themselves.

10. Private Sub Command1_Click()
If MaskEdBox1.ClipText = "" Then
MsgBox "insert the value of date"
MaskEdBox1.SetFocus
ElseIf Option1.Value = False Then
MsgBox "first select the option"
Else
MsgBox "Hello Class"
End
End If
End Sub
Private Sub Form_Load()
Option1.Value = False
End Sub
Private Sub Text1_KeyPress(KeyAscii As Integer)
If KeyAscii < 65 Or KeyAscii > 90 Then
If (KeyAscii < 97 Or KeyAscii > 122) And KeyAscii <> 8 And KeyAscii <> 32 Then
KeyAscii = 0
End If
End If
End Sub
Private Sub Text1_LostFocus()
If Text1.Text = "" Then
MsgBox "first enter the name"
Text1.SetFocus
End If
End Sub