The function IsEmail takes as input a string and then tries to verify if this string has the correct format for an email address. To accomplish this, we create a regular expression that checks for the typical format of an email address such as username@serverprovider.com.
See below for the function definition:

Code Snippet 1 //Include Regular Expressions at the top of your script using System.Text.RegularExpressions; private bool IsEmail(String strEmail) {   Regex objEmailPattern=          new Regex(@"^([0-9a-zA-Z]([-\.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$");   return objEmailPattern.IsMatch(strEmail);  }

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