输出文件流问题
输出StringBuilder的文件流，总是一闪而过，却不提示保存，在Maxthon2中和其它机器的浏览器中却正常，实在搞不懂了

Response.Clear()
Response.Buffer = True
Response.Charset = "GB2312 "
Response.AppendHeader( "Content-Disposition ", "attachment;filename=mcdatamdx.xls ")
Response.Output.Write(OutStr.ToString)
Response.Flush()
Response.End()

[解决办法]
OutStr.ToString 是啥