Validating datagridview cell in vb net
Now when we run this again, we still get our Tool Tip when we hover over the control, but now we’re also overlaying the control with Text Block we defined in our Control Template.Notice that there’s no more red border: Okay a pretty lame example, I admit.Now all the controls in the entire application can pick up this Style.Replacing the Entire Error Template So far all we’ve done is specify a Style Trigger.Then set the Window’s Data Context to the customer Data Table: WPF’s Default Validation Error Template So if we were to run this as-is WPF would give us a default visual cue when our validation fails.
We can completely change the Error Template that is used by defining a new one here in the Application. Let’s take a simple example by setting up our Error Template to display a generic message over the control.Our Word of the Year choice serves as a symbol of each year’s most meaningful events and lookup trends.It is an opportunity for us to reflect on the language and ideas that represented each year.The problem (besides being a sarcastic message) is that the Text Block is really covering the control and you have to hover over the edge to get the Tool Tip to display.
The other problem of course is that if we start typing into the field again the message won’t disappear until we tab off if it so that’s pretty annoying.
For instance, if we have a customer Data Table we can write validation for the Last Name field like so: If you’re building our own custom business objects or are using LINQ to SQL classes then it’s up to you to implement the IData Error Info interface yourself.