Using DatePicker with MaskedEdit toolbox

I am using masked edit and date picker control in C# where I am passing Date like 10/01/2014 and into masked edit time like 08:20. When I am running then displaying message "string was not recognized as a valid date time". Below code as added.

string SCDateTimeValue = Convert.ToDateTime(dtpSCDate.Value) + mskSCTime.Text;