Group GridView Data

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

// Written by Anurag Gandhi.
// Url: http://www.gandhisoft.com
// Contact me at: soft.gandhi@gmail.com

/// <summary>
/// Summary description for GlobalData
/// </summary>
public class GlobalData
{
    public static class DataSource
    {
        public static string FileName = "_Data\\Result.xls";
        public static string TableName = "Sheet1$";
    }

    /// <summary>
    /// Returns the KeyValuePair List of columns as a dataSource for ddlGroupColumn.//
    /// </summary>
    /// <returns>List&lt;KeyValuePair&lt;string, string&gt;&gt;</returns>
    public static List<KeyValuePair<string, string>> GetGroupColumns()
    {
        List<KeyValuePair<string, string>> list = new List<KeyValuePair<string, string>>();
        string[] strColumnList = new string[] { "Year", "Branch", "Gender", "College" };

        list.AddRange(strColumnList.Select(x => new KeyValuePair<string, string>(x, x)));
        return list;
    }
}