format date string

I have a string  01012004  which is in format ddmmyyyy

i want to format it so it can be converted to a valide date

I'm trying but doesn't work??

strInDate = string.Format(strInDate,"{0:##/##/####}");  
strOutDate = DateTime.Parse(strInDate);

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DateTime dtInput = DateTime.ParseExact(sDate, "ddMMyyyy", System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat);

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outDate = inDate.Substring(0, 2) + "/" + inDate.Substring(2, 2) + "/" + inDate.Substring(4);


outDate = DateTime.ParseExact(date, "ddMMyyyy",
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