Работа с параметрами в OLEDBConnection

            OleDbConnection ExcelConnection = new OleDbConnection
                (@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + "pathName.xls" + ";Extended Properties=Excel 8.0;");
            ExcelConnection.Open();
 
            OleDbCommand Command = new OleDbCommand(@"INSERT INTO [Лист1$] (number, price, netcost) VALUES (?, ?, ?)", ExcelConnection);
 
            Command.Parameters.Add("@number", OleDbType.VarChar, 15, "number");
            Command.Parameters.Add("@price", OleDbType.VarChar, 300, "price");
            Command.Parameters.Add("@netcost", OleDbType.Decimal, 300, "netcost");
 
 
            Command.Parameters["@number"].Value = @"jl";
            Command.Parameters["@price"].Value = @"hfp hfp";
            Command.Parameters["@netcost"].Value = 343;
 
            Command.ExecuteNonQuery();
 
            ExcelConnection.Close();

Command.ExecuteNonQuery();

command = new OleDbCommand(
"INSERT INTO [Лист1$] ([number],[price], [netcost]) VALUES (number, price, netcost)", ExcelConnection);
command.Parameters.Add("number", OleDbType.Char, 15).Value="jl";
command.Parameters.Add("pricer", OleDbType.Char, 300).Value="jhfp hfp";
command.Parameters.Add("netcost", OleDbType.Decimal, 300).Value=343;