一些常用的方法

1、Form窗口

1.1、获取当前控件属性         sender.GetType().Name

1.2、取到DataGridView中的行  DataGridViewCellEventArgs  e

取到鼠标所在表中的行              e.RowIndex

1.3、随机字符串的方法

/// <summary>
        /// '产生随机字符串
        /// </summary>
        /// <param name="num">随机出几个字符</param>
        /// <returns>随机出的字符串</returns>
        private string GenCode(int num)
        {
            //string str = "的一是严";
            string str = "abcde12345";//便于输入启用字母数字组合
            char[] chastr = str.ToCharArray();
            //string[] source ={ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "#", "$", "%", "&", "@" };
            string code = "";
            Random rd = new Random();
            int i;
            for (i = 0; i < num; i++)
            {
                //code += source[rd.Next(0, source.Length)];
                code += str.Substring(rd.Next(0, str.Length), 1);
            }
            Session["CheckCode"] = code;

            return code;

        }

1.4、画图

/// <summary>
        /// 生成图片（增加背景噪音线、前景噪音点）
        /// </summary>
        /// <param name="checkCode">随机出字符串</param>
        private void CodeImage(string checkCode)
        {
            if (checkCode.Trim() == "" || checkCode == null)
                return;
            Session["Code"] = checkCode; //将字符串保存到Session中，以便需要时进行验证
            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)(checkCode.Length * 12), 22);//汉字使用22，字母使用12
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器
                Random random = new Random();

                //清空图片背景色
                g.Clear(Color.White);

                // 画图片的背景噪音线
                int i;
                for (i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }

                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Brown, Color.Black, 1.2F, true);
                g.DrawString(checkCode, font, brush, 2, 2);

                //画图片的前景噪音点
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());

            }
            catch
            {
                g.Dispose();
                image.Dispose();
            }

        }

1.5、页面代码

<td class="a2">
           <asp:TextBox ID="CheckCodeInput" runat="server" CssClass="input_val"></asp:TextBox>
            <script language="javascript" type="text/javascript">
               document.write(" <img   id='verifyCodePic'  src='ImageR.aspx?temp= " + Math.random() + "' onclick='changeVerifycode()'> ");
             </script>
 </td>

 function changeVerifycode() {
            document.getElementById("verifyCodePic").src = "ImageR.aspx?temp=" + Math.random();

        }