asp.net mvc design pattren "Error:Operator '>' cannot be applied to operands of type 'string' "

Question

Aspx.cs

FieldsLogin fls = new FieldsLogin();
        fls.EmailId =txtemail.Text;
        fls.Password = txtpwd.Text;
        if  (fls.EmailId> 0)  // Error':input string not in the correct formate
        {
            Response.Write("Sucess");
        }
        else
        {
            Response.Write("Error");
        }


Model(Loginfields):

 public class FieldsLogin
    {
        public string EmployeeName { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string UserName { get; set; }
        public string Password { get; set; }
        public string ConfirmPassword { get; set; }
        public string EmailId { get; set; }
        public string PhoneNo { get; set; }
        public string Address { get; set; }
    }
}