[c#] mousehover event

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C#

I have a code on Class1:

public void r1_MouseHov(Object sender, MouseEventArgs e)
       {
                int velRad = System.Int32.Parse(f1.toolStripTextBox2.Text);
                Rectangle oblRad = new Rectangle(e.X, e.X, velRad, velRad);
     ControlPaint.DrawReversibleFrame(f1.pictureBox4.RectangleToScreen(oblRad), Color.Black, FrameStyle.Thick);
       }

and on class Form1:

pictureBox4.MouseHover += new MouseEventHandler(Class1.r1_MouseHov);        

And i get the error:

Cannot implicitly convert type 'System.Windows.Forms.MouseEventHandler' to 'System.EventHandler'

MouseHover is not in the MouseEventHendler? If I use EventArgs (System.EventArgs) i can`t use e.X and e.Y? How to fix this? How do you add events like that?

What am i trying to do is when mouse hovers, it shows the rectangle by the pointer.