c#格式化时间

代码 /// <summary>
/// 格式化时间为MM-dd-yyyy
/// 添加人：冯俊杰
/// 添加时间：2010-04-02
/// </summary>
/// <param name="datastring"></param>
/// <returns></returns>
protected string ConvertDateTimeToString(string datastring)
{
System.Globalization.DateTimeFormatInfo dateFormat = new System.Globalization.DateTimeFormatInfo();
if (!string.Empty.Equals(datastring))
{
dateFormat.ShortDatePattern = "MM-dd-yyyy";
dateFormat.DateSeparator = "-";
DateTime DateTimes = Convert.ToDateTime(datastring);
return DateTimes.ToString(dateFormat);
}
else
{
return string.Empty;
}
}