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Regex rgx = new Regex("^(?![0-9]+$)(?![a-zA-Z]+$)(?![a-z!@#$]+$)(?![A-Z!@#$]+$)(?![\\d!@#$]+$)^[a-zA-Z\\d!@#$]{6,20}$");
if (!rgx.IsMatch(password))
{
return false; ;
}
else
{
return true;
}