error no value given for one or more required parameters.'

Question

When i try to get data from excel sheet i get error

 

no value given for one or more required parameters.'

 

why this happen

 

i work in visual studio 2010 with excelsheet 2013

 

my code in c# as following

public DataTable ShowWrongExcelData()

           {

               string connectionString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\";", txtPath.Text);
               OleDbConnection con = new OleDbConnection(connectionString);
               con.Open();

               string str = @"SELECT  [??? ?????????] as [UnitCode],[????? ??????]as[CurrentMeterReading] FROM  [Sheet5$] where [CurrentMeterReading] <= 0 ";
               OleDbCommand com = new OleDbCommand();
               com = new OleDbCommand(str, con);
               OleDbDataAdapter oledbda = new OleDbDataAdapter();
               oledbda = new OleDbDataAdapter(com);
               DataSet ds = new DataSet();
               ds = new DataSet();
               oledbda.Fill(ds, "[Sheet5$]");
               con.Close();
               System.Data.DataTable dt = new System.Data.DataTable();
               dt = ds.Tables["[Sheet5$]"];
               return dt;
           }

 why give this error i dont use any parameters

but when i select all data from Excel sheet as following :

@"SELECT [??? ?????????] as [UnitCode],[????? ??????]as[CurrentMeterReading] FROM [Sheet5$]";

I get data without anyh problem

so that How to solve this error please ?

Excel sheet InvoiceData.xlsx sample

http://www.mediafire.com/file/b62b5ub26mrt9t1/InvoiceData.xlsx