窗体移动和阴影，对话框控件

//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);
    }
}

//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);
        }

 private void 自定义CToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DialogResult dr = colorDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                richTextBox1.ForeColor = colorDialog1.Color;            
            }
        }

private void 选项OToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DialogResult dr = fontDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                richTextBox1.Font = fontDialog1.Font;
            }
        }

richtextbox.forecolor=fontdialog.color;

 private void button2_Click(object sender, EventArgs e)
        {
            DialogResult dr= folderBrowserDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                richTextBox1.Text = folderBrowserDialog1.SelectedPath;
            }
        }

using System.IO;

 private void button2_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "文本文件|*.txt";//设置打开格式
            DialogResult dr= openFileDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                label1.Text = openFileDialog1.FileName;//显示文件路径名
                StreamReader sr = new StreamReader(openFileDialog1.FileName,Encoding.Default);//防止乱码
                richTextBox1.Text= sr.ReadToEnd();
            }
        }

private void button3_Click(object sender, EventArgs e)
        {
            saveFileDialog1.Filter = "文本文件|*.txt|word|*.doc";
            DialogResult dr = saveFileDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                StreamWriter sw = new StreamWriter(saveFileDialog1.FileName,false,Encoding.Default);//防止乱码
                sw.Write(richTextBox1.Text);
                sw.Flush();
            }
        }