Code for sorting Grid View items on basis of Name or ID or any other column in Visual Studio WebPart( For SharePoint 2010)

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data;
using System.Collections;
using System.Collections.Generic;
using Microsoft.SharePoint;

namespace TimerSharePoint.SortGridView
{

/* Class for get and set value of columns of a list in SharePoint. I have taken these 5 columns */
    class Data
    {
        public string Name { get; set; }
        public string Branch { get; set; }
        public string Roll_No { get; set; }
        public string Address { get; set; }
        public string Mobile_No { get; set; }
    }

    class Datarollasc : IComparer<Data>
    {

/* When your field is of string data type(I have used String above in Data class) */
        public int Compare(Data x, Data y)
        {
            return string.Compare(x.Roll_No, y.Roll_No);
        }
/* When your field is of Int data type(Although I haven't used String above in Data class but if u have int type then use this commented code) */
        //public int Compare(Data x, Data y)
        //{
        //    if (x.Branch > y.Branch) return 1;
        //    else if (x.Branch < y.Branch) return -1;
        //    else return 0;
        //}
    }

    class Datarolldesc : IComparer<Data>
    {
        public int Compare(Data x, Data y)
        {
            return (-1 * string.Compare(x.Roll_No, y.Roll_No));
        }

        //public int Compare(Data x, Data y)
        //{
        //    if (x.Branch < y.Branch) return 1;
        //    else if (x.Branch > y.Branch) return -1;
        //    else return 0;
        //}
    }

    class Datanameasc : IComparer<Data>
    {
        public int Compare(Data x, Data y)
        {
            return string.Compare(x.Name, y.Name);
        }
    }
    class Datanamedesc : IComparer<Data>
    {
        public int Compare(Data x, Data y)
        {
            return (-1 * string.Compare(x.Name, y.Name));
        }
    }
    class Dataaddressasc : IComparer<Data>
    {
        public int Compare(Data x, Data y)
        {
            return string.Compare(x.Address, y.Address);
        }
    }
    class Dataaddressdesc : IComparer<Data>
    {
        public int Compare(Data x, Data y)
        {
            return (-1 * string.Compare(x.Address, y.Address));
        }
    }
    class vary
    {
        static public int count1 = 1;
        static public int count2 = 1;
        static public int count3 = 1;
    }
    public partial class SortGridViewUserControl : UserControl
    {
        SPList info = SPContext.Current.Web.Lists["cust"];
        List<Data> data = new List<Data>();
        protected void Page_Load(object sender, EventArgs e)
        {
                try
                {

                    foreach (SPListItem item in info.Items)
                    {
                        Data d = new Data();
                        d.Roll_No = item["Roll_No."].ToString();
                        d.Name = item["Name"].ToString();
                        d.Mobile_No = item["Mobile_No."].ToString();
                        d.Address = item["Address"].ToString();
                        d.Branch = item["Branch"].ToString();
                        data.Add(d);


                    }
                    GridView1.DataSource = data;
                    GridView1.DataBind();


                }
                catch (Exception ex)
                {
                    Label1.Text = ex.Message + "-" + ex.StackTrace;

                }

          
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Datarollasc rasc = new Datarollasc();
            Datarolldesc rdes = new Datarolldesc();

            if (vary.count1 == 1)
            {
                vary.count1 = 0;
                data.Sort(rasc);
            }
            else if (vary.count1 == 0)
            {
                vary.count1 = 1;
                data.Sort(rdes);
            }
            GridView1.DataSource = data;
            GridView1.DataBind();
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            Label1.Text = "click2";
            Datanameasc nasc = new Datanameasc();
            Datanamedesc ndsc = new Datanamedesc();

            if (vary.count2 == 1)
            {
                vary.count2 = 0;
                data.Sort(nasc);
            }
            else if (vary.count2 == 0)
            {
                vary.count2 = 1;
                data.Sort(ndsc);
            }
            GridView1.DataSource = data;
            GridView1.DataBind();
        }

        protected void Button3_Click(object sender, EventArgs e)
        {
            Label1.Text = "click3";
            Dataaddressasc addasc = new Dataaddressasc();
            Dataaddressdesc adddsc = new Dataaddressdesc();
            if (vary.count3 == 1)
            {
                vary.count3 = 0;
                data.Sort(addasc);
            }
            else if (vary.count3 == 0)
            {
                vary.count3 = 1;
                data.Sort(adddsc);
            }
            GridView1.DataSource = data;
            GridView1.DataBind();

        }
    }
}