/// 获取时间戳
/// </summary>
/// <returns></returns>
public static string GetTimeStamp(System.DateTime time)
{
    long ts = ConvertDateTimeToInt(time);
    return ts.ToString();
}
/// <summary>  
/// 将c# DateTime时间格式转换为Unix时间戳格式  
/// </summary>  
/// <param name="time">时间</param>  
/// <returns>long</returns>  
public static long ConvertDateTimeToInt(System.DateTime time)
{
    System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
    long t = (time.Ticks - startTime.Ticks) / 10000;   //除10000调整为13位      
    return t;
}

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使用： 
string TIMESTAMP = GetTimeStamp(DateTime.Now); //时间戳