String was not recognized as a valid datetime entity framework

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C#

CrystalReports

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I wanna pass string like "-" to Crystal Report when DateOfBirth is Null


i am using this code for pass date to crystal report

 <pre>.Select(u => new
{

u.EmployeeCode,
u.EmployeeName,
JopName = string.IsNullOrEmpty(u.JopName) ? "-" : u.JopName,
Date_Hiring = u.Date_Hiring.GetValueOrDefault(),
AdministrationName = string.IsNullOrEmpty(u.AdministrationName) ? "-" : u.AdministrationName,
DepartmentName = string.IsNullOrEmpty(u.DepartmentName) ? "-" : u.DepartmentName,
PranchName = string.IsNullOrEmpty(u.PranchName) ? "-" : u.PranchName,
DateOfBirth =Convert.ToString(u.DateOfBirth) == string.Empty ? DateTime.Parse("-") : u.DateOfBirth
})
 .ToList();

and this is my Class

<pre>public partial class SR1_Result
 {
   public int EmployeeCode { get; set; }
   public string EmployeeName { get; set; }
   public string JopName { get; set; }
   public Nullable<System.DateTime> Date_Hiring { get; set; }
   public Nullable<double> Nat_Salary { get; set; }
   public string AdministrationName { get; set; }
   public string DepartmentName { get; set; }
   public string PranchName { get; set; }
   public string MobilePersonalNo { get; set; }
   public string MobileWorkNo { get; set; }
   public Nullable<System.DateTime> DateOfBirth { get; set; }
}

What I have tried:

i try pass "-" when the DateOfBirth is Null

using this

DateOfBirth =Convert.ToString(u.DateOfBirth) == string.Empty ? DateTime.Parse("-") : u.DateOfBirth

but get this error

System.FormatException: 'String was not recognized as a valid DateTime.'