Develop Reference

Is it possible to disable a control but still receive events for that control?

In windows forms I have a simple TextBox:
TextBox textBox = new TextBox() { Text = "text" };
textBox.Enabled = false;
textBox.MouseEnter += (object sender, EventArgs e) =>
{
MessageBox.Show("MOUSE ENTERED"); // this never fires if the control is disabled.
};
I want to disable the users ability to interact with the control and I want the control to be styled as a disabled control. But I also want to receive MouseEnter,MouseLeave, and Click events from the control so that I can change the background cover of the control on hover and respond to clicks on the control.
But as I have just discovered if you disable a windows forms control it disabled the events as well. I know with some effort I can accomplish the same thing by checking mouse coordinates globally but it would be a lot nicer if I could just have it disabled but still receive events for it. Is that possible?

Enabled doesn't really do anything in Windows Forms itself. It is a property of windows controls in general that a disabled window doesn't receive input messages (such as mouse events and keyboard events). So no, there is no way for you to disable a control and still receive those messages. Windows just don't work that way on Windows. It's not the TextBox control filtering those messages away - they don't come in the first place.
TextBox is a great wrapper around a windows common control. When you do something like tbx.Text = "Hello";, the TextBox just sends a message to that common control, saying "change the text to Hello". If you want to change that, you need to make the control essentially from scratch. You can make some hack that reverts whatever the common control does as response to a mouse event, but these usually don't work very well and tend to break down in unexpected ways.
In practice, what you really want is probably to tweak either the way ReadOnly behaves (e.g. disabling focus as well as making the control read only, but that's again just a dirty hack), or replace the TextBox with a control that can either be a control or a label - allowing you to switch between the two. If you want the text box to stop behaving as a text box, stop it from being a text box. Problem solved :)
I'd still reconsider using ReadOnly, though. Are you sure the user would not want to select text in the text box and copy it somewhere else? Or change the reading order?

How to put password mask in windows application c# Application

I am developing windows application to ask user to enter password in pop up box on that i am not able to put password mask,
if any on know could you please help me out this i am new to visual studio
string pin=Microsoft.VisualBasic.Interaction.InputBox("Input User Pin Number", "Pin Number", "" );

There is no easy way of doing this with an InputBox. (You'd have to install a hook before showing the dialog, and then when it was displayed, hunt around for its textbox control and change its styles.) Better to just say "can't". The InputBox wasn't designed to be customizable. In fact, it wasn't even designed to be used by .NET applications. It's an old classic VB thing, provided in the compatibility namespace merely to facilitate porting classic VB apps to VB.NET.
There is no real advantage in using it. Just create your own form with a label, maybe an icon, and a textbox. Set the textbox control's UseSystemPasswordChar property to true. (You could do as rashfmnb suggested and set the PasswordChar property, but it is better to use the system's password character instead of your own, that way it always matches the user's expectations.)
Be sure to display your new form with the ShowDialog method so that it will be a modal dialog (blocking call), just like InputBox.

user PasswordChar Property of the textbox

You can't mask the chars in an InputBox.
If you look at Interaction.InputBox Method on MSDN, there is no way to set it to be password input.
You will need to create a new Form, add your own Label and a TextBox, then set the PasswordChar property in the TextBox

C# Windows app, clear textbox on focus

I'm very new to C# and I'm trying to make a simple GUI hangman game to help me learn. I am using a textbox to both output errors (The letter was already entered. Try again) etc. and input the user's guess. However my problem comes in that whenever the user is given an error, they have to manually clear the textbox. What I'm looking for is a feature in most search boxes, google for example, that clears (in google's case, highlights) the text currently in the box.
I know it can be simply done using
textboxname.Clear();
but I'm not sure where it should go, I can place it under the code for a button without a problem but my instinct is to put it outside of the button's {} , however when I try this the text box isn't recognized and if statements can't be used.
I think I'm looking for:
if (TextBoxName.Focus)
{
TextBoxName.Clear();
}
But I'm just not sure where to put it

in C# Windows Form, how to send commands to a text box?

I'm making a typing windows program in C#,
It's finally finished now, but I just need to make the user able to write and practice in Arabic.
In the beginning of each typing session, there will be a Combo Box for him to choose
between English and Arabic,
What I want, is that if he chooses Arabic, I want the typingTextBox typing cursor to immediately switch to the right side of the screen (RCtrl + RShift)
and switching the typing language to Arabic (Alt + RShift)
How can I do that ?

You can write an event handler for SelectedIndexChanged event on your ComboBox. Inside it use:
RightToLeft property of TextBox to change the cursor position.
InputLanguage.CurrentInputLanguage static property to change the input language for your application

C# How to programmatically tab between controls

I would like to be able to programmatically emulate the keyboard
navigation for dialog boxes.
I have a custom hardware device with a keypad that I would like to use for
dialog box navigation.
I know about Focus(), but I'd rather do something that automatically
respected the tab order. By emulating the keyboard navigation I don't
have to worry about re-inventing complex behavior for each type of
control.
Does anyone know how to do this?
Thanks!

For Winforms, you want want the Control.GetNextControl() method
For WPF, you want the UIElement.MoveFocus() method

In Winforms:
Control nextControl = this.GetNextControl(myControl, true);
To simulate a tab press, I believe it's the following:
SendKeys.Send("{TAB}");

You could use P/Invoke to call the Windows API function keybd_event to simulate pressing the Tab key.
Bonus: you can use your device to enter tabs into a text editor as well! ;)