![]() Output: Valid Phone Number Output: Invalid Phone Numberĭownload the source code below and try it! :)įor more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below. In this example, the DXErrorProvider.DataSource property is set to the BindingSource. youll see an example that uses the ErrorProvider with control validation. How to Make a Tic Tac Toe Game in VB.Net. You can also follow this dataset validation approach, replacing the standard ErrorProvider component with the DXErrorProvider. Classic Controls / Introduction from User Interfaces in C(c) Windows Forms. In this example, we will see how to display a warning icon when user enter some wrong or unacceptable input. If match, it will display " Valid phone number!" and otherwise " Not Valid phone number!". VB.NET public class DXErrorProvider : ComponentBase, IExtenderProvider, ISupportInitialize. 1,521 2 2 gold badges 23 23 silver badges 59 59 bronze badges. It has to match with the expression of 000 format. This will hep you to understand the error provider in the windows forms development. Heres the link Check for empty TextBox controls in VB.NET. Next, we use the IsMatch function to compare the value inputted in our textbox to the regular expression of the phonenumber variable. The " d" there indicates the number of digits inside the expression. We initialized phonenumber to hold the values of our regular expression ("\d") which means it has a digit of 4 - digit of 3 - and digit of 4.
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