////// method for determining is the user provided a valid email address /// We use regular expressions in this check, as it is a more thorough /// way of checking the address provided /// /// email address to validate///true is valid, false if not valid using System.Text.RegularExpressions; public bool IsValidEmail(string email) { //regular expression pattern for valid email //addresses, allows for the following domains: //com,edu,info,gov,int,mil,net,org,biz,name,museum,coop,aero,pro,tv string pattern = @"^[-a-zA-Z0-9][-.a-zA-Z0-9]*@[-.a-zA-Z0-9]+(.[-.a-zA-Z0-9]+)*. (com|edu|info|gov|int|mil|net|org|biz|name|museum|coop|aero|pro|tv|[a-zA-Z]{2})$"; //Regular expression object Regex check = new Regex(pattern,RegexOptions.IgnorePatternWhitespace); //boolean variable to return to calling method bool valid = false; //make sure an email address was provided if (string.IsNullOrEmpty(email)) { valid = false; } else { //use IsMatch to validate the address valid = check.IsMatch(email); } //return the value to the calling method return valid; }
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