尝试使用-

 hdfCreatedOn.Value = Convert.ToString(DateTime.Now); 

有关详细信息，请通过此-
C#datetime-format [ ^ ]

尝试以下代码:

 hdfCreatedOn.Value = Convert.ToString(DateTime.Now);
hdfCreatedOn.Value = 字符串 .Format(" ，DateTime.Now); // "2012年6月27日下午4:32" 
hdfCreatedOn.Value = 字符串 .Format(" ，DateTime.Now); //  2012年6月27日4:32:07 PM  

plz Please help me. In my project one field is ''CreatedOn'' and in that saving date time. for that field in database it has datetime datatype and while saving it i am converting in into string as :

hdfCreatedOn.Value = Convert.ToString(DateTime.Today); 

But it saves date as 2012-06-27 00:00:00.000 it not shows time.

Try using -

hdfCreatedOn.Value = Convert.ToString(DateTime.Now);

For details go through this-
C# datetime-format[^]

Try below code:

hdfCreatedOn.Value = Convert.ToString(DateTime.Now); 
hdfCreatedOn.Value = String.Format("{0:g}", DateTime.Now);  // "6/27/2012 4:32 PM"
hdfCreatedOn.Value = String.Format("{0:G}", DateTime.Now);  // "6/27/2012 4:32:07 PM"