Set Error(txt Student Name, "Please enter student name") Else Error Provider1. Show("Data submited successfully.") End If If chk Age. check out the following url for another simplest one article related to this article... Add(txt Student Name, "Student Full Name") My Error Provider. 'If any mandotary field is empty this function displays a message and returns FALSE. Check And Show Summary Error Message = True Then Message Box. The trick is to set the Validating Type of the Masked Text Box control to the type of data you want to get from the user.If you do this, as well as subscribe to the Type Validation Completed event, on the form Load event, you can handle user validation inside your Type Validation Completed event handler.Furthermore, it's unnatural to conceptualize the steps of validation as of the data to be validated.For example, if you were describing the input, you might say, "It should be between five and eight characters; it should be numeric and non-negative; it should always end in the digit '5,' etc." The concept of considering the data qualities rather than the validation process leads to the validation engine discussed in this article.
If yes, when the focus is moved from one of these textboxes to the Save button, the textbox's Validating event will be raised.
A modular, data-driven validation engine approach provides a more natural interface, more flexibility, and is easier to maintain.
Visual Studio lets you specify property values at design time for a variety of components; using that approach for defining validation attributes is a natural extension, and makes incorporating robust validation simpler for developers.
I have a windows form that I want to force validation on controls (text boxes) when the user clicks a "Save" button. Select() End if Next c End Sub Each control has code in their Control_Validating event that fires off an errorprovider. Here's my code Private Sub Save() For each c as control in Me. Try using the Lock Window Update API call to prevent the objects from being updated while you cycle through the list. If you hit an error, or you successfully reach the end of the list, a call to Lock Window Update(0&) releases the lock.
The only way I've found to do this is to cycle through every control and call it's . This is clunky though because you can see a flash in each text box as it's being validated. Select() End if Next c End Sub Each control has code in their Control_Validating event that fires off an errorprovider. Here's my code Private Sub Save() For each c as control in Me. Since only one lock can be in place at any one time you would want to lock the whole form during the validation phase.