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Binding multiple mediaplayers to multiple keys C# WPF

So, I'm trying to build kind of a sampler. Just for fun. I'm kinda at a loss here;
I've created a grid of 4x4 in wpf and filled them with buttons. Each button has a corresponding mediaplayer (so they would not cut off the other audio when triggered)
I've added a clickevent for each button and a keydown event as wel. Now, the click events all work fine. But the keydown event only works for the last button I clicked on. The rest is unresponsive. Can anyone tell me how to fix this?
a keydown event:
private void Pad_1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.NumPad7)
{
playPad(mediaPlayer1, mp1);
}
}
and my playPad method:
public void playPad(MediaPlayer mediaPlayer, string mp)
{
if (mp != null)
{
mediaPlayer.Open(new Uri(mp));
mediaPlayer.Play();
}
}
Thanks in advance!

MouseWheel Event On ComboBox Triggers KeyDown Event

Create a Windows Form (Net Framework or Net Core) and add a Toolstrip with ToolStripComboBox control. And then add these methods:
public Form1()
{
InitializeComponent();
KeyDown += Form1_KeyDown;
}
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
//any code here;
}
If Form KeyPreview = false then Form1_KeyDown event is not triggered with MouseWheel event on ToolstripComboBox. Setting KeyPreview = true (is necessary) causes MouseWheel event is captured by Form1_KeyDown handler as Up or Down.
Is there a way to prevent Form_KeyDown handler Not To Handle MouseWheel event?

both using comments here as source and referencing vs code knowledge, one solution to this:
private void Form1_KeyDown(dynamic sender, KeyEventArgs e)
{
if (sender.GetType().Name != "Form1")
{
//code for action...
}
}

MouseDown/MouseUp and Click events out of sync

I have a winforms app, that catches MouseDown, MouseUp and Click events.
Clicking the form slowly (once a second or so) and the event counters stay in sync.
Clicking quickly and the down/up event tallys keep track, but click event tally falls behind:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private int clicks = 0;
private void Form1_MouseClick(object sender, MouseEventArgs e)
{
clicks++;
textBox1.Text = clicks.ToString();
}
private int mdown=0;
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
mdown++;
textBox2.Text = mdown.ToString();
}
private int mup = 0;
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
mup++;
textBox3.Text = mup.ToString();
}
}
Reading docs: https://msdn.microsoft.com/en-us/library/ms171542.aspx this doesn't seem possible - am i missing something obvious
(This happens when using trackpad buttons or external bluetooth mouse, so hopefully this is a programming error and not an issue with the machine.)
EDIT
Damien is of course correct, tracking double clicks as well and everything stays in sync:
private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
{
clicks++;
textBox1.Text = clicks.ToString();
}

Because sometimes you're clicking fast enough that you're triggering double-clicks. Consider the sequence from the documentation page you linked to:
Following is the order of events raised for a double mouse-button click:
MouseDown event.
Click event.
MouseClick event.
MouseUp event.
MouseDown event.
DoubleClick event. (This can vary, depending on whether the control in question has the StandardDoubleClick style bit set to true. For more information about how to set a ControlStyles bit, see the SetStyle method.)
MouseDoubleClick event.
MouseUp event.
And notice that there are twice as many MouseDown/MouseUp events in that sequence as there are MouseClick events.

Handle press and release of button

I want a button to function like this:
if button is down(mouse button is hold down)
{
bool trySmthing = true;
}
if button is up
{
bool trySmthing = false;
}
I tried some stuff with KeyUp and KeyDown events but they don't give the right result.

Apparently the focus must be in your application; a tutorial on handling the mouse events via the .NET framework in C# can be found here. The MouseDown event, as documented here and the MouseUp event, as documented here, are of particular interest..

This should help: Micosoft Library for C# Mouse-events
void MouseUpHandler(Object sender, RoutedEventArgs args)
{
// This method is called whenever the PreviewMouseUp event fires.
}
void MouseDownHandler(Object sender, RoutedEventArgs args)
{
// This method is called whenever the PreviewMouseDown event fires.
}

event handler to detect mouse drag on picture box(winforms,c#)

I am making simple paint application in which a line would be drawn whenever someone holds down the mouse button and drags(exactly like in windows paint).
However i am having a hard time finding the suitable event handler for this. MouseDown is simply not working and MouseClick is only jotting down dots whenever i press a mouse down.
Need help in this matter.
Thanks.

Handle MouseDown and set a boolean variable to true. Handle MouseMove and, if the variable is set to true and the mouse's movement is above your desired treshold, operate. Handle MouseUp and set that variable to false.
Example:
bool _mousePressed;
private void OnMouseDown(object sender, MouseEventArgs e)
{
_mousePressed = true;
}
private void OnMouseMove(object sender, MouseEventArgs e)
{
if (_mousePressed)
{
//Operate
}
}
private void OnMouseUp(object sender, MouseEventArgs e)
{
_mousePressed = false;
}