请问怎么导入excel的表

如下：
string str;
str= "Provider=Microsoft.Jet.OLEDB.4.0;"
+"Data Source=C:\\test.xls;"
+"Extended Properties=Excel 8.0;";
ADODataSetCommand myCmd = new ADODataSetCommand("SELECT * FROM [Sheet1$]", str);
DataSet myDataSet = new DataSet();
myCmd.FillDataSet(myDataSet, "ExcelInfo");