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Hovering the mouse over the error icon will tell you what is wrong and how to fix it.
In this example we will see how to use the Error Provider control in Windows forms to provide validations in Windows Forms and display user-friendly error messages to the user if the validation fails.
However, if the user doesn't edit in any textbox on the form and click the Save button directly, the textbox's Validating event won't be raised. 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.The last thing we need is for a Message Box to pop up when we tab away from a field, telling us it's invalid. Also, we don't want all the validation done when the user presses the OK button, because they could then potentially be given a great big message with all the fields that are wrong.So what we need is a method of unobtrusively showing that data is invalid, and presenting it in such a way that it is immediately obvious what is wrong and what to do about it.Here's my code Private Sub Save() For each c as control in Me. Doh, That probably won't go, the events have different event arguments. But you can of course set in your Save Click event a routine that calls all the validating methods you want. Enable Allow Focus Change And you have Dialog Result set on the OK button itself.
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.