convert text to datetime

Question

While converting text to datetime I got error..The code is given below...

 

bjJobBL.JobDate =Convert.ToDateTime("txtDate.Text");

 

 Here the jobdate is declared in the class  as

 private DateTime? m_JobDate; 

Its properties are like this... 

 

public DateTime? JobDate
{
get
{
return m_JobDate;
}
set
{
m_JobDate = value;
}
}