KeyDown : recognizing multiple keys

You can check the modifiers of the KeyEventArgs like so:

private void listView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Up && e.Modifiers == Keys.Control)
    {
        //do stuff
    }
}  

MSDN reference

From the MSDN page on KeyEventArgs:

if (e.KeyCode == Keys.F1 && (e.Alt || e.Control || e.Shift))
{
    //Do stuff...
}

In the KeyEventArgs there are properties Ctrl, Alt and Shift that shows if these buttons are pressed.

private void listView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Up && Keyboard.IsKeyDown(Key.LeftCtrl))
    {
         //do stuff
    }
}

This code will work only if you press first LeftCtrl, then "UP". If order has no importance, I recommend that one :

if ((Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))&& Keyboard.IsKeyDown(Key.Z))
{
    //do stuff
}

In that case, both Ctrl are taken in account, and no importance about the order.

You can use the ModifierKeys property:

if (e.KeyCode == Keys.Up && (ModifierKeys & Keys.Control) == Keys.Control)
{
    // CTRL + UP was pressed
}

Note that the ModifierKeys value can be a combination of values, so if you want to detect that CTRL was pressed regardless of the state of the SHIFT or ALT keys, you will need to perform a bitwise comparison as in my sample above. If you want to ensure that no other modifiers were pressed, you should instead check for equality:

if (e.KeyCode == Keys.Up && ModifierKeys == Keys.Control)
{
    // CTRL + UP was pressed
}

I tested below code. it works...

private void listView1_KeyDown(object sender, KeyEventArgs e)
    {
        if ((int) e.KeyData == (int) Keys.Control + (int) Keys.Up)
        {
            MessageBox.Show("Ctrl + Up pressed...");
        }
    }

It took me a while to find the hint I ultimately needed when trying to detect [Alt][Right]. I found it here: https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355ab9a-9214-4fe1-87ea-b32dfc22946c/issue-with-alt-key-and-key-down-event?forum=wpf

It boils down to something like this in a Shortcut helper class I use:

public Shortcut(KeyEventArgs e) : this(e.Key == System.Windows.Input.Key.System ? e.SystemKey : e.Key, Keyboard.Modifiers, false) { }

public Shortcut(Key key, ModifierKeys modifiers, bool createDisplayString)
{
    ...
} 

After "re-mapping" the original values (notice the e.Key == System.Windows.Input.Key.System ? e.SystemKey : e.Key part), further processing can go on as usual.

if (e.Control && e.Shift && e.KeyCode == Keys.A) {

}

The KeyDown event will only hold the information for the most recent key that was pressed. I have had success building a string that contains all the most recent key down keys concatenated together.

If a key down of "Control" was clicked, or the strings becomes greater than 10 chars long, I clear the string.

Checking the string each time, then performing a task afterwords gives a great use for a secret hotkey function within your application.

    private void ConfigurationManager_KeyDown(object sender, KeyEventArgs e)
    {
        string currentKey = e.KeyCode.ToString().ToLower();

        if ((currentKey == "controlkey") || (hotKeyList.Length > 10))
        {
            hotKeyList = "";
        }
        else
        {
            hotKeyList += currentKey;
        }

        if ((hotKeyList == "int") && (!adminLogin))
        {
            hotKeyList = "";
            adminLogin = true;
            AdminLoginEvn();
        }
    }

For the function above my hotkeys would be "Control (clears the string) + i + n + t" to fire my AdminLoginEvn method. The adminLogin boolean was incorporated so I only run my AdminLoginEvn one time while the application is open.

you have to remember the pressed keys (ie in a bool array). and set the position to 1 when its pressed (keydown) and 0 when up .

this way you can track more than one key. I suggest doing an array for special keys only

so you can do:

 if (e.KeyCode == Keys.Control)
 {
        keys[0] = true;
 }
// could do the same with alt/shift/... - or just rename keys[0] to ctrlPressed

if (keys[0] == true && e.KeyCode == Keys.Up)
 doyourstuff