验证码制作之三：通过ASCEE码随机生成4位字符与数字验证码

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Text; /// <summary> /// ValidateCode 的摘要说明 /// </summary> public class ValidateCode { public ValidateCode() { } //通过ASCEE码随机生成4位字符串组成验证码 public string validateCode() { // byte[] bytes = new byte[100]; Random randObj = new Random(); int code; for (int i = 0; i < 4; i++) { code = randObj.Next(44, 122); bytes[i] = Convert.ToByte(code); } ASCIIEncoding ascii = new ASCIIEncoding(); string validateCode = ascii.GetString(bytes,0,4); return validateCode.ToString(); } }