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Press key and hold event for button in Winform

I'm trying to make a button change its fore color when we press a key. Like button's name is "A" and we press A it changes the fore color into red, then we release the key it turns back to its default color. But I can't find any such event.
Thank you! :D

It's KeyDown, KeyPress, and KeyUp event you should use.
Refer to this link.
http://csharp.net-informations.com/gui/key-press-cs.htm

If you want to capture a key typed anywhere on a form, you can use Keydown, KeyPress and KeyUp like ydoow said, but you will also have to set the form's KeyPreviewproperty to true to make sure your events are raised even if a key is typed while in a specific control.

Check string in textbox with an event?

I'm wondering if there is a way to use an event to check a string in a textBox in a windows form before the user clicks on the OK button?

You can use the KeyDown, KeyPress, or KeyUp event.
A full list of events can be found here: http://msdn.microsoft.com/en-us/library/system.windows.forms.textbox_events.aspx
It's all alphabetical, so scroll down to Key....

A better approach is to use the Validating event of the textbox. This way, your validation routine runs when the user attempts to leave the textbox.

Silverlight detect wether loosing focus is because tab is pressed or mouse is clicked

Is there a way in silverlight to detect when a lost focus event is triggered if this
happens because the tab key is pressed or the user presses a mouse button on another control.
This is what i want to achieve:
I have a RadGridView with 1 row. In the last column i have a numeric input, when
an user tabs out of this control, a new row should be added to the sourcecollection in the viewmodel, this automaticly adds a new row to the grid, then the first column on this row should have focus and the dropdownlist in the celledittemplate should be opened.
When i use the lost focus event adding the new row works fine, though this also works when i don't use tab to unfocus the control. Also, the first column on the new row is not selected, it somehow
gives focus to row 0 column 0.

Ok, inspired by the answer Dipak gave I came up with a slightly different solution,
I handled the Gridviews keydown and keyup events, keydown sets a bool to true, keyup to false.
the execution sequence fortunately is keydown, lostfocus, keyup
so in the lost focus event I only need to check wether the bool is true;
strangely enough the keyup event is not always triggered, but since the lostfocus is
I set the bool to false there also.

yes you can trace it, Provided you have implemented mouse up/down event on each focusable element on your screen. You will have flag to check if mouse preview event up/down happen on any element, if not then its TAB key which cause lost focus.
This is work around if some one not suggest proper solution.

How to raise a textBox_InsertPlaceChanged event in TextBox at C#?

I couldnt make good question i know,but it is what i could.When user write something in textbox there appear symbol flashing which shows place which will be inserted character.It can be changed by left and right arrow buttons.I want to raise event when it is changed or something that i can get index of this "symbol".is there any property at textBox for it?

The "symbol" is called a caret. When it's position changes, the SelectionChanged event is fired, and you can programmatically retrieve the position using the CaretIndex property on the TextBox.
You can find more information about this here.

WinForms ComboBox - Event when Text Input is Clicked Into

I have a feature request that when a ComboBox is 'clicked into' that it clears the text so that the user can start entering in new data to search. Does anyone know of a way to hook into this? The 'click' event is raised on when the text is clicked as well as when the drop down arrow is also clicked (which opens up the drop down with items). I only want it to happen on the first, not the latter.
Right now I'm capturing the click event and filtering on the DroppedDown property like so:
if(!comboBox.DroppedDown)
{
// clear selection
}
This seems to work most of the time, but bugs out frequently as well... so its not 100%.
If anyone knows of a proper way to do this I would appreciate!

Don't handle the click event. For one thing, it won't fire if the user tabs the focus into the control. Use the Enter event which fires when the control receives focus. And rather than clearing text you should just select it all which will give the best of both worlds:
1) The user can start entering new text which will clear any old text or
2) tab past the control and leave the contained text as it was.
If you always remove the previous text you may anger users.

Try the "Enter" event. It happens when a control gains focus on the form.