private void Export(string FileType, string FileName)
{
//设置回应状态
Response.Charset = "GB2312";
Response.ContentEncoding = Encoding.GetEncoding("GB2312");
Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8));
Response.ContentType = FileType;
EnableViewState = false;
List <Contract> theContractSearch = SearchContract();
ContractCollection theContracts = new ContractCollection();
theContracts.TheContracts = theContractSearch;
StringWriter theExcel = theContracts.ExportContractSearchToExcel();
Response.Write(theExcel.ToString());
Response.End();
theExcel.Close();
}