导出Excel

string mystring="Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = 'D:/ExportToExcel/excel/test.xls';Extended Properties=Excel 8.0";
OleDbConnection cnnxls = new OleDbConnection (mystring);
OleDbDataAdapter myDa =new OleDbDataAdapter("select * from [Sheet1$]",cnnxls);
DataSet myDs =new DataSet();
myDa.Fill(myDs);