STring to Date time in C#

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C#

hi,

i want to save date field to database . i am creating a date here like the code i given below . i am getting the error
String was not recognized as a valid DateTime.

here is the code i am using

string res= (DateTime.Now.Date.ToString("dd/MM/yyyy") + " " +          txtTimeIn.Text.ToString() + ":00 " + ddlTimeInAMPM.SelectedValue.ToString());
DateTime aaaaaa = (DateTime) (res)
txtTimeIn.Text= 9:00
ddlTimeInAMPM.SelectedValue=AM

i know the case of casting string to datetime but . it works last time suddenly it doesnt