// Due to a naming-clash you'll need the following line in your imports:
using Mouse = InputStateManager.Inputs.Mouse;

// Now lets create a manager for our inputs:
private readonly InputManager input = new InputManager();
...

/// <summary>
///     Allows the game to run logic such as updating the world,
///     checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
  if (input.Pad.Is.Press(Buttons.Back) || input.Key.Is.Press(Keys.Escape))
    Exit();
  // Update the manager so that it can record changes:
  input.Update();
  base.Update(gameTime);
}
...

// Somewhere in your code:

if (input.Mouse.Is.Press(Mouse.Button.LEFT)) {...}
  // ...which is equivalent to:
  if(input.Mouse.Is.Down(Mouse.Button.LEFT) && 
     input.Mouse.Was.Up(Mouse.Button.LEFT))) {...}
// Or:
if (input.Mouse.Is.Release(Mouse.Button.LEFT)) {...}
  // ...which is equivalent to:
  if(input.Mouse.Is.Up(Mouse.Button.LEFT) && 
     input.Mouse.Was.Down(Mouse.Button.LEFT))) {...}
// If you want to see if both buttons are currently down:
if (input.Mouse.Is.Down(Mouse.Button.Left, Mouse.Button.Right)) {...}
// Or, for example, if you wanna see if one of those is down:
if (input.Mouse.Is.OneDown(Mouse.Button.Left, Mouse.Button.Right)) {...}

var positionDelta = input.Mouse.Is.PositionDelta;
var scrollWheelDelta = input.Mouse.Is.ScrollWheelDelta;
// Or, if you want the values of the last update:
if (input.Mouse.Was.Up(Mouse.Button.MIDDLE)) {...}
...

// Somewhere in your code:

if (input.Key.Is.Press(Keys.Escape)) {...}
// Register keys that are currently held down:
if (input.Key.Is.Down(Keys.A) && input.Key.Is.Down(Keys.B)) {...}
// Same as:
if (input.Key.Is.Down(Keys.A, Keys.B)) {...}
// Or:
if (input.Key.Is.Down(new []{Keys.A, Keys.B})) {...}
// Register key-presses (down -> up):
if (input.Key.Is.Press(Keys.A) || input.Key.Is.Press(Keys.B)) {...}
// Same as:
if (input.Key.Is.OnePress(Keys.A, Keys.B)) {...}
// Or:
if (input.Key.Is.OnePress(new []{Keys.A, Keys.B})) {...}
// Query for any SHIFT-key pressed:
if (input.Key.Is.Down(Keys.A) && input.Key.Is.ShiftDown) {...}
// Same for CTRL and ALT:
if (input.Key.Is.CtrlRelease() || input.Key.Is.AltPress()) {...}
// And NumLock- and CapsLock-states:
if (input.Key.Is.NumLockOn() && input.Key.Is.CapsLockOff()) {..}
// And the transitions of those states:
if (input.Key.Is.NumLockStateExit() || input.Key.Is.CapsLockStateEnter()) {..}
// Or their respective key-presses or up-down values:
if (input.Key.Is.Down(Keys.NumLock) || input.Key.Is.Release(Keys.CapsLock))
...

// Somewhere in your code:
if (input.Pad(PlayerIndex.One).Is.Press(Buttons.A)) {...}
// For prototypes the PlayerIndex defaults to One on all calls:
if (input.Pad().Is.Press(Buttons.A)) {...} //Same as above
// In a real game you'd have a variable as PlayerIndex, like:
PlayerIndex p;
// Then, for example:
if (input.Pad(p).Is.Connected && input.Pad(p).Is.Release(Buttons.Back)) {...}
// Or to catch the event of a GamePad being connected:
if (input.Pad(p).Is.JustConnected {...}
// Or:
if (input.Pad(p).Is.DPad.Press(Pad.DPadDirection.LEFT) {...}
// Or for the thumb-sticks (directional vector2):
Vector2 thumbPos = input.Pad(p).Is.ThumbSticks.Left;
Vector2 thumbDelta = input.Pad(p).Is.ThumbSticks.RightDelta;
// Or for the triggers (%pressed as float):
float triggerPos = input.Pad().Is.Triggers.Right;
float triggerDelta = input.Pad(PlayerIndex.Four).Is.Triggers.LeftDelta;
...

// Somewhere in your code:

// For now the touchPanel implementation only provides the
// TouchCollection for 'Is' and 'Was':
var touchCollection = input.Touch.Is.Collection;
var oldTouchCollection = input.Touch.Was.Collection;