Note that the United States Accessibility code prohibits objects that blink faster than 2 Hz and slower than 55 Hz (see /saos/excerpted_stds.html) at least in part because blinking can cause seizures and other life-threatening reactions in some people. The default behavior of blinking a couple of times and then stopping is probably reasonable, but a message that is constantly blinking very quickly is a bad idea. You can change this icon if you want to use a special error image.īlinking text can be extremely irritating to users, so don’t abuse it. The component’s Icon property gives the icon that the component displays for an error. If BlinkStyle is NeverBlink, then the component displays the error icon without blinking.
The icon continues blinking, even if another application has the focus, until the user fixes the error and moves to a new field to trigger the Validating event handler again. If BlinkStyle is AlwaysBlink, then the component makes the icon blink as long as the control has an associated error.
#Vb.net remove errorprovider zip
Because the previous code uses the same error message whenever the ZIP code value does not contain exactly five digits, the message remains unchanged if the user changes the ZIP code to a new invalid value, so the icon does not blink again. If BlinkStyle is BlinkIfDifferentError, then the component makes the icon blink several times whenever the program sets a control’s error message to a new nonblank value. The BlinkStyle property determines how it blinks. The component’s BlinkRate property determines how quickly the error icon blinks. ErrorProvider1.SetError(txtZip, "") End If End Sub ErrorProvider1.SetError(txtZip, "Invalid ZIP code format") Else ' It's valid. Private Sub txtZip_Validating(ByVal sender As Object, _ ByVal e As ) Handles txtZip.Validating If Not (txtZip.Text Like "#") Then ' It's invalid. ' Verify that this is a 5-digit ZIP code. This makes the ErrorProvider remove any error icon it is currently displaying next to the control. If the text does contain five digits, then the code calls the ErrorProvider component’s SetError method to clear any error currently set for the txtZip TextBox. If the user hovers the mouse over the error icon, the component displays a tooltip showing the error message. At this point, the Error?Provider component displays an icon showing a little red circle containing a white exclamation mark next to the text box and makes the icon blink several times to draw the user’s attention to the error. If the text does not contain five digits, then the program calls the ErrorProvider component’s SetError method to associate the error “ Invalid ZIP code format” with the TextBox. The code uses a Like statement to see if the text contains exactly five digits. When the user enters a value and moves to another field, the control’s Validating event handler, shown in the code, fires. Suppose that the TextBox txtZip should contain a five-digit ZIP code.
The following code shows how a program might use an ErrorProvider component. Dim ctrl As Control Dim sErrorList As Strimg sErrorList '' For Each ctrl In Me.Controls If Len (ErrorProvider1.GetError (ctrl)) > 0 Then sErrorList + ErrorProvider1.GetError (ctrl) & ChrW (10) & ChrW (13) End If Next If Len (sErrorList) 0 Then Process stuff if no errors Else Messagebox. The ErrorProvider component indicates to the user that another control has an error associated with it.
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