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DataTable Excel_UserInfo = new DataTable();
string strConn = @"Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + fileInfo.FullName + ";" + "Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1;\"";
string strExcel = "select * from [sheet1$]";
using (OleDbDataAdapter adaptor = new OleDbDataAdapter(strExcel, strConn))
{
DataSet ds = new DataSet();
adaptor.Fill(ds);
Excel_UserInfo = ds.Tables[0];
}