Develop Reference

Windows API in outlook to cover send button

I've been tasked with removing the send button in outlook, not just from the ribbon but from the message form. I've tried making some custom forms but they always seem to be lacking. We also have a custom button solution using them Item_send event, so tying into that event was causing issues.
I have been toying around with a different idea, to use the windows API to add a button over the Default send button.
I've done some research on this and have only found 1 suggestion to this being possible but the post didn't include too much information. My question is threefold, is it even possible? Is it a good idea? If so, where do I start?
p.s. Normally I'm a mobile engineer so I feel like a fish out of water when even googling stuff about the windows API but i'm confident I can pick it up with time.

If you need control over the sending process, the accepted and supported mechanism is to hook into the ItemSend event and cancel/approve as required according to your business logic. Otherwise, removing functionality from Outlook is a bad design decision.

Dynamic validation in metro applications

Im developing an application for the windows store in c#, and wondering whats the best way to dynamically validate data in controls such as Textboxes, Dropdown boxes etc.
At the minute I usually check the validation when a buttons clicked, I would like to be able to notify the user in realtime.
An example of where i would like this to be used in when a user registers with an email address I would like to check the format of the string using a regex command.
Any assistance would be appreciated

you can use relay command
eg Relay Command and MVVM pattern

Implementing incremental search to filter GridView results?

I'm writing a Windows 8 Metro app with a GridView with several pages worth of items. I'd like to provide the user with an incremental-search kind of filtering capability. I'm thinking it would pop up a text field as soon as the user starts typing.
I thought that implementing the search contract might be the way to accomplish this, but it doesn't appear to have the incremental behavior I'm looking for.
Anyone know of an example of something like this?
Thanks.

You can wire into the SuggestionsRequested event from the SearchPane.getForCurrentView(). As the user types, you could process each key stroke and filter the data you are displaying in the Grid.
Having said that, filtering is usually implemented directly in the UI and not via the Search contract. Thus, I like your idea of going with a text field and processing each keystroke.

Best practice for visual validation of textbox control data

I think I want to show some kind of confirmation tick type thing by a textbox - (it's traditional windows forms stuff, not WPF) - but not sure if it's a bit naff. I would like some kind of slick way of showing that a value is incorrect or valid after some tests have been done i.e. a web service is valid with that name or SMTP server seems to running with that name etc.
Should there be even any visual stuff going on or should a simple message on a status strip at the bottom of the window be enough.....
Any ideas are most welcome.
PS - if the tick thing is a good idea what's the best way to implement this with a textbox control.
Example....

You could make a custom control which contains both a textbox and an imagebox. The custom control could raise a validation event which checks the text and then sets the imagebox graphic based on whether or not the validation passed (or sets it blank if there is not text in the textbox).
The .net centric way would probably be to implement validation providers and some type of custom error provider, like what Henrik is mentioning.

You can use ErrorProvider to show a little exclamation mark when the entered value is incorrect.

you can use the ErrorProviderComponent in order to show notifications. The naming of that component is slightly unfortunate in my mind but you can easily change the icon to show other things than the typical red error "X".

how to validate a textbox programmatically, that is at run time

i am creating textboxes when a button is clicked and again and again and so on
while accepting input i need to check if the boxes are all full,
i know how to do this using design view but how to do this using coding
that is add and validation control to the textbox when it created before initializing/adding it to the page.?
validation should be not null..

So as for validating the user input I would stay away from the ASP.Net Control Validators as hardly anyone in industry uses them. I would use the jQuery validator plugin which is included in a new Visual Studio project by default. You will still want Server side checking but it is much easier to call String.isNullOrEmpty(txtBox.Text) rather than using the Control Validators.