Now, enter some data into the textboxes and press the button again. If you place the mouse pointer over one of these icons, a tooltip will appear containing the message you set in the click event. You will see small icons (exclamation point into a red circle) appear to the right of both textboxes. Start the application and press the Validate button without filling textboxes. Private Sub btnValidate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ĮrrorProvider1.SetError(txtFName, "You must provide the first name.")ĮrrorProvider1.SetError(txtLName, "You must provide the last name.")
#Errorprovider class code#
Now, in the code window, just after the "Windows Form Designer generated code" section, copy this snippet of code:
On the form, add 2 TextBox controls (that you will name txtFName and txtLName), a ErrorProvider control, and a Button control (name it btnValidate). To do this, create a new VB.Net Windows application.
#Errorprovider class how to#
The first thing we will explore is how to validate when the user click on a button (like a Save or a OK button).
#Errorprovider class download#
When you select one these controls, its properties are in the same usual spot in the properties dialog just like the textbox control.īefore starting, I want to let you know that you can download complete and commented listing at the end of this article (instead of doing copy-and-paste of the code below). Don't look for a strange place to find their properties. This area simply aligns all these specials controls allowing you to select them when you need to work with them. This area is called the designer's component tray (and is normally located at the bottom of the form). Instead of overloading the form at design time with these controls, a new area has been created to receive The ErrorProvider control, like the Timer control and the ToolTip control is invisible at runtime. The ErrorProvider control extends about any existing controls, not just editable controls like the textbox but also buttons, labels, and almost all others! When you place a ErrorProvider control on a form, you can discover that almost allĬontrols off the form have been extended. So this month column will introduce you to the ErrorProvider Control in Windows Forms.įirst, I need to say that what we will use is a control but a special one. Net Windows Forms now implement this cool little feature quite easily. Users had to get accustomed to each method. For years, programmers created many different methods to implement validation. Side if the data entered is valid (before going to server thus saving bandwidth). Many of these page have validators (a mechanism that can validate on the client
Everyone has ever filled a form on the Web, either a survey, a registration, a taxation report, or maybe your expense report. Eric Moreau, February 1, 2003Everyone has ever filled a form on the Web, either a survey, a registration, a taxation report, or maybe your expense report.
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