无边框窗体移动:
//窗体移动API

[DllImport("user32.dll")]

public static extern bool ReleaseCapture();

[DllImport("user32.dll")]

public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int IParam);

public const int WM_SYSCOMMAND = 0x0112;

public const int SC_MOVE = 0xF010;

public const int HTCAPTION = 0x0002;

[DllImport("user32")]

private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);

private const int WM_SETREDRAW = 0xB;

private void Form1_MouseDown(object sender, MouseEventArgs e)

{

    if (this.WindowState == FormWindowState.Normal)

    {

        ReleaseCapture();

        SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);

    }

}
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窗体阴影：

 //窗体阴影API

        const int CS_DropSHADOW = 0x20000;

        const int GCL_STYLE = (-26);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        public static extern int GetClassLong(IntPtr hwnd, int nIndex);

        public Form1()

        {

            InitializeComponent();

            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);

        }