private void CheckKeyboardAndUpdateMovement()
{
    KeyboardState keyboardState = Keyboard.GetState();
    if (keyboardState.IsKeyUp(Keys.Left)) { ChangeTexture(1); }
    if (keyboardState.IsKeyUp(Keys.Right)) { ChangeTexture(2); }
    if (keyboardState.IsKeyDown(Keys.Left))
    {
        Movement -= Vector2.UnitX;
        ChangeTexture(3);
    }
    if (keyboardState.IsKeyDown(Keys.Right))
    {
        Movement += Vector2.UnitX;
        ChangeTexture(4);
    }
    if ((keyboardState.IsKeyDown(Keys.Space) || keyboardState.IsKeyDown(Keys.Up)) && IsOnFirmGround())
    {
        Movement = -Vector2.UnitY * JumpHeight;
    }
}

Here it is my method to get keyboard state and change texture based on which key is pressed.

it works if direction are pressed, but doesn't make its own job when nothing is pressed (just because both the IsKeyUp are true). Only the cases' order prevents the static texture to be shown while moving the sprite... My question is, how can I make a clean solution of this problem?