/// <Summary>Gets the next Captcha</Summary>
protected virtual string GetNextCaptcha()
{
StringBuilder sb = new StringBuilder();
Random random = new Random();
int intMaxLength = CaptchaChars.Length - 1;
for (int n = 0; n < CaptchaLength; n++)
{
sb.Append(CaptchaChars.Substring(random.Next(intMaxLength), 1));
}
return(sb.ToString());
}
/// <summary>
/// Gets the next Captcha
/// </summary>
/// <history>
/// [cnurse] 03/17/2006 created
/// </history>
protected virtual string GetNextCaptcha()
{
var sb = new StringBuilder();
var rand = new Random();
int n;
var intMaxLength = CaptchaChars.Length;
for (n = 0; n <= CaptchaLength - 1; n++)
{
sb.Append(CaptchaChars.Substring(rand.Next(intMaxLength), 1));
}
return(sb.ToString());
}
/// <summary>
/// Gets the next Captcha
/// </summary>
/// <history>
/// [cnurse] 03/17/2006 created
/// </history>
protected virtual string GetNextCaptcha()
{
var sb = new StringBuilder();
var rand = new Random();
int n;
var intMaxLength = CaptchaChars.Length;
for (n = 0; n <= CaptchaLength - 1; n++)
{
sb.Append(CaptchaChars.Substring(rand.Next(intMaxLength), 1));
}
var challenge = sb.ToString();
var cacheKey = string.Format(DataCache.CaptchaCacheKey, challenge);
DataCache.SetCache(cacheKey, challenge, TimeSpan.FromMinutes(2));
return(challenge);
}
/// <summary>
/// Gets the next Captcha
/// </summary>
protected virtual string GetNextCaptcha()
{
var sb = new StringBuilder();
var rand = new Random();
int n;
var intMaxLength = CaptchaChars.Length;
for (n = 0; n <= CaptchaLength - 1; n++)
{
sb.Append(CaptchaChars.Substring(rand.Next(intMaxLength), 1));
}
var challenge = sb.ToString();
//NOTE: this could be a problem in a web farm using in-memory caching where
// the request might go to another server in the farm. Also, in a system
// with a single server or web-farm, the cache might be cleared
// which will cause a problem in such case unless sticky sessions are used.
var cacheKey = string.Format(DataCache.CaptchaCacheKey, challenge);
DataCache.SetCache(cacheKey, challenge, (DNNCacheDependency)null, DateTime.Now.AddSeconds(_Expiration + 1),
Cache.NoSlidingExpiration, CacheItemPriority.AboveNormal, null);
return(challenge);
}
