How to get last day of the last month with asp.net

///

/// Returns the last date of the previous month in yyyy-MMM-dd format...
///
/// Date to get the last date of its previous month

///

public string GetLastDate(DateTime dt_now)
{
string str_Last = "";
DateTime dt_Last = new DateTime();
int _Day = 0;
_Day = dt_now.Day;
TimeSpan ts = new TimeSpan(_Day, 0, 0, 0, 0);
dt_Last = dt_now.Subtract(ts);
str_Last = dt_Last.ToString("yyyy-MMM-dd");
return str_Last;
}

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ShriKrishna Bhardwaj , With ASP.Net, SQL Server, Javascript