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public struct Account
    {
        public string Password_C
        {
            get{return Password;}
            set{Password = value;}
        }
        public string EMail_C
        {
            get{return EMail;}
            set{EMail = value;}
        }
        public string EMail;
        public string Password;
}
Account AccountArray = new Account[50];
// Hier dann mit iwas befüllen...
Accounts.DataSource = AccountArray;					

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public class Account
{
  // ...
}

List<Account> accountList = new List<Account>;
// hier dann befüllen...
accountList.Add(new Account());

Accounts.DataSource = accountList;					

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public class Account
{
    public string EMail { get; set; }
    public string Password { get; set; }
}