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The validated event works the same, only pass it the name textbox instead.
Here is just the validating event handler’s code: The event driven validation model in Win Forms is powerful and flexible enough to allow you to create high quality apps that implement robust and maintainable validation code in your forms.
There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.
The error provider simply takes a control and a message in the Set Error method and does the rest of the work for you!
Following this section of code, the next thing up to look at is the validation handler for the non-empty string text box control: There are couple of interesting things to note in this handler; first off note that a boolean is set to capture the results of a method called "txt Empty String Is Valid"; this is the method that actually tests the contents of the text box to make sure that it is not empty.
First, add the following code to the Form’s constructor after the Initialize Component method: This is a handy trick to prevent implicit validation of our controls when they lose focus.This solution is a C# Windows Forms application that contains a single form.On the form are eight different text boxes and each these text boxes are validated against a different set of criteria: Figure 3 (below) shows the solution explorer for the project.The code starts off with the default imports; in addition to the defaults, the Regular Expression library has also been added to the code in order to support the evaluation of one of the text boxes against a regular expression.The constructor and form load event handler are both in their default conditions.
Naturally it is just as easy to validate other controls such as a combo box control although it most likely going to be used with text box controls.