/// <summary>
/// 生成验证码
/// </summary>
/// <param name="type">1-系统级验证码 2-手机短信验证码 3-邮箱验证码</param>
/// <returns></returns>
private string GetSystemVerificationCode(string type)
{
string code = String.Empty;
switch (type)
{
case "1":
code = ValidateCodeHelper.GetRandLetterAndNumber(4, true);
break;
case "2":
break;
case "3":
break;
}
return(code);
}