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using System.Data;
using System.Data.Odbc;
using System.Reflection;
using System.Runtime.Remoting;
using System;
using System.Collections.Generic;

public class ExcelReader
{
    public List<DataItem> DataList = new List<DataItem>();
    public List<AnotherDataItem> AnotherDataList = new List<AnotherDataItem>();
    string fileName;
    string con;
    public ExcelReader()
    {
        fileName = "a.xls";
        con = "Driver={Microsoft Excel Driver (*.xls)};DriverId=790;Dbq=" + fileName + ";";
        ReadAndFill<DataItem>("DataSheet", DataList);
        ReadAndFill<AnotherDataItem>("AnotherDataSheet", AnotherDataList);
    }

    void ReadAndFill<T>(string sheetName, List<T> list)
    {
        DataTable table = this.FillDataTable(sheetName);
        this.FillDataList<T>(table, list);
        table.Clear();
    }

    DataTable FillDataTable(string sheetName)
    {
        string query = "SELECT * FROM [" + sheetName + "$]";
        OdbcConnection oCon = new OdbcConnection(con);
        OdbcCommand oCmd = new OdbcCommand(query, oCon);
        DataTable dataTable = new DataTable(sheetName);
        oCon.Open();
        try
        {
            OdbcDataReader rData = oCmd.ExecuteReader();
            dataTable.Load(rData);
            rData.Close();
            oCon.Close();
        }
        catch ( Exception )
        {
            oCon.Close();
        }
        return dataTable;
    }


    void FillDataList<T>(DataTable table, List<T> list)
    {
        list.Clear();
        if ( table.Rows.Count <= 0 )
            return;
        FieldInfo [] fields = typeof(T).GetFields();
        foreach ( DataRow row in table.Rows )
        {
            if ( row.IsNull(0) )
            {
                //"Sheet " + table.TableName + " has a null column at index = " + index);
                continue;
            }
            object o = Activator.CreateInstance(typeof(T));
            foreach ( FieldInfo field in fields )
            {
                try
                {
                    if ( row.Field<object>(field.Name) == null )
                        continue;
                    if ( field.FieldType.IsEnum )
                        field.SetValue(o, Enum.Parse(field.FieldType, Convert.ToString(row.Field<object>(field.Name)), true));
                    else
                        field.SetValue(o, Convert.ChangeType(row.Field<object>(field.Name), field.FieldType));
                }
                catch ( Exception e )
                {
                    if ( e.GetType() == typeof(IndexOutOfRangeException) )
                    {
                        //There is no column named as " + field.Name + " at sheet " + table.TableName;
                    }
                    else
                    {
                        //Excel Reading Error at sheet " + table.TableName + " at index = " + index + " at field = " + field.Name + "\nException Message = " + e.Message;
                    }
                }
            }
            list.Add(( T )o);
        }
    }
}