Introduction

I found lot of articles in which custom paging is given but i have a requirement that in which when user click on a page number then only 10 page numbers should show like paging shown in Google search page.

create PROCEDURE [dbo].[GetCustomersPageWise]
(
  @PageIndex INT = 1, 
  @PageSize INT = 10 , 
  @RecordCount INT OUTPUT
) 
AS 
BEGIN 
  SET NOCOUNT ON; 
  SELECT ROW_NUMBER() OVER
  ( ORDER BY [cust_ID] ASC ) 
  AS RowNumber 
  ,[cust_ID]
  ,[cust_Name]
 INTO #Results
  FROM [customer_details]
 
  SELECT @RecordCount = COUNT(*)
  FROM #Results
        
  SELECT * FROM #Results
  WHERE RowNumber BETWEEN(@PageIndex -1) * @PageSize + 
        1 AND(((@PageIndex -1) * @PageSize + 1) + @PageSize) - 1
 
  DROP TABLE #Results
END

.aspx page

<body style="overflow:hidden;" onload="javascript:full();">
    <form id="form1" runat="server">
   <div>
PageSize:
<asp:DropDownList ID="ddlPageSize" runat="server" AutoPostBack="true" 
                   OnSelectedIndexChanged="PageSize_Changed">
    <asp:ListItem Text="2" Value="2" />
    <asp:ListItem Text="5" Value="5" />
    <asp:ListItem Text="7" Value="7" />
</asp:DropDownList>
<hr />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
           CellPadding="4" ForeColor="#333333" GridLines="None">
    <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    <Columns>
        <asp:BoundField HeaderText="CustomerId" DataField="cust_ID" />
        <asp:BoundField HeaderText="CustomerName" DataField="cust_Name" />
    </Columns>
    <EditRowStyle BackColor="#999999" />
    <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#E9E7E2" />
    <SortedAscendingHeaderStyle BackColor="#506C8C" />
    <SortedDescendingCellStyle BackColor="#FFFDF8" />
    <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
<br />
<asp:Repeater ID="rptPager" runat="server">
<ItemTemplate>
    <asp:LinkButton ID="lnkPage" runat="server" Text = '<%#Eval("Text") %>' 
       CommandArgument = '<%# Eval("Value") %>' 
       Enabled = '<%# Eval("Enabled") %>' 
       OnClick = "Page_Changed"></asp:LinkButton>
</ItemTemplate>
</asp:Repeater>
</div>

</form>
</body>

.aspx.cs page

using System.Data.SqlClient;
using System.Configuration;
using System.Data;

public partial class sample2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            GetCustomersPageWise(1);
        }
    }
    private void GetCustomersPageWise(int pageIndex)
    {
        string constring = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constring))
        {
            using (SqlCommand cmd = new SqlCommand("GetCustomersPageWise", con))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@PageIndex", pageIndex);
                cmd.Parameters.AddWithValue("@PageSize", int.Parse(ddlPageSize.SelectedValue));
                cmd.Parameters.Add("@RecordCount", SqlDbType.Int, 4);
                cmd.Parameters["@RecordCount"].Direction = ParameterDirection.Output;
                con.Open();
                IDataReader idr = cmd.ExecuteReader();
                GridView1.DataSource = idr;
                GridView1.DataBind();
                idr.Close();
                con.Close();
                int recordCount = Convert.ToInt32(cmd.Parameters["@RecordCount"].Value);
                this.PopulatePager(recordCount, pageIndex);
            }
        }
    } 
      private void PopulatePager(int recordCount, int currentPage)
    {
        double dblPageCount = (double)((decimal)recordCount / decimal.Parse(ddlPageSize.SelectedValue));
        int pageCount = (int)Math.Ceiling(dblPageCount);
        List<ListItem> pages = new List<ListItem>();
        if (pageCount > 0)
        {
            pages.Add(new ListItem("First", "1", currentPage > 1));
            if (currentPage == 1 && pageCount <= 10)
            {
                for (int i = 1; i <= pageCount; i++)
                {
                    pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
                }
            }
            else if (currentPage == 1 && pageCount > 10)
            {
                for (int i = 1; i <= 10; i++)
                {
                    pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
                }
            }
            else if (currentPage != 1 && pageCount <= 10)
            {
                for (int i = 1; i <= pageCount; i++)
                {
                    pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
                }
            }
            else if (currentPage != 1 && pageCount > 10 && currentPage != pageCount)
            {
                int z = currentPage - 5;
                int x, y;
                if (z < 1)
                {
                    z = 1;
                    for (int i = z; i <= 10; i++)
                    {
                        pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
                    }
                }
                else if (z >= 1)
                {
                    if (pageCount < currentPage + 4)
                    {
                        y = (z - ((currentPage + 4) - pageCount));
                        x = pageCount;
                    }
                    else
                    {
                        x = currentPage + 4;
                        y = z;
                    }
                    for (int i = y; i <= x; i++)
                    {
                       pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
                    }
                }
            }
            else if (currentPage == pageCount)
            {
                for (int i = pageCount-9; i <= pageCount; i++)
                {
                    pages.Add(new ListItem(i.ToString(), i.ToString(), i != currentPage));
                }
            }
            pages.Add(new ListItem("Last", pageCount.ToString(), currentPage < pageCount));
        }
        rptPager.DataSource = pages;
        rptPager.DataBind();
    } 
    protected void PageSize_Changed(object sender, EventArgs e)
    {
        this.GetCustomersPageWise(1);
    }
    protected void Page_Changed(object sender, EventArgs e)
    {
        int pageIndex = int.Parse((sender as LinkButton).CommandArgument);
        this.GetCustomersPageWise(pageIndex);
    }
}

Custom paging like Google paging