How to add string value to timestamp in C# [on hold]

i have textedit1.text it has a value 2 in my winform,..and then i have timedit called timePekerjaanStart value 04:00:00 . the case is i wanna addition between textedit1 and timePekerjaanStart ,i catch the result in timestamp called timePekerjaanEnd. so , i wanna get the result timePekerjaanEnd = textedit1 + timePekerjaanStart as like 2 + 04:00:00 = 06:00:00