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Generate Unique file name in ASP.NET

string FileName = (DateTime.Now.Day.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Year.ToString() + DateTime.Now.ToShortTimeString().Replace(":", "")).Replace(" ", "").ToLower().Replace("am", "").Replace("pm", "");
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string myUniqueFileName = string.Format(@"{0}", Guid.NewGuid());
------------------
string filename = DateTime.Now.ToString("G");
string[] temp = filename.Split(' ');
filename = (DateTime.Now.Day.ToString() + "" + DateTime.Now.Month.ToString() + "" + DateTime.Now.Year.ToString() + "" + temp[1]).Replace(":", "").Replace(" ", "").ToLower().Replace("am", "").Replace("pm", "");
 -----------------
public string GenerateFileName(string context)
{
        return DateTime.Now.ToString("yyyyMMddHHmmssfff");
}
------------------
public string GenerateFileName(string context)
    {
        return context + "_" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + "_" + Guid.NewGuid().ToString();
}

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