DataList Paging in ASP.Net using C#

DataList List Paging in ASP.Net using C#

DataListPaging.aspx

<asp:DataList ID="dlCities" runat="server" Width="250px" RepeatColumns="1" RepeatDirection="Vertical"
    BorderColor="Maroon" BorderStyle="Solid" BorderWidth="1" OnItemCommand="dlCities_ItemCommand">
    <HeaderStyle VerticalAlign="Middle" HorizontalAlign="Center" />
    <HeaderTemplate>
        <div style="width: 250px; height: 25px; background-color:Maroon;color:White;">
            Cities of India
        </div>
    </HeaderTemplate>
    <ItemStyle HorizontalAlign="Center" />
    <ItemTemplate>
        <asp:Label ID="lblCityName" runat="server" Text='<%# Bind("CityName") %>'></asp:Label>
    </ItemTemplate>
    <SeparatorTemplate>
        <div style="width: 250px; height: 1px; background-color:Maroon;">
        </div>
    </SeparatorTemplate>
    <FooterStyle VerticalAlign="Middle" HorizontalAlign="Center" />
    <FooterTemplate>
        <div style="width: 250px; height: 25px; background-color:Maroon;">
            <asp:LinkButton ID="lbFirst" runat="server" Text="|<" CommandName="First" ForeColor="White"  
                 ToolTip="First"></asp:LinkButton>&nbsp;&nbsp;
            <asp:LinkButton ID="lbPrevious" runat="server" Text="<" CommandName="Previous" 
             ForeColor="White" ToolTip="Previous"></asp:LinkButton>&nbsp;&nbsp;
            <asp:LinkButton ID="lbNext" runat="server" Text=">" CommandName="Next" ForeColor="White" 
             ToolTip="Next"></asp:LinkButton>&nbsp;&nbsp;
<asp:LinkButton ID="lbLast" runat="server" Text=">|" CommandName="Last" ForeColor="White"     
     ToolTip="Last"></asp:LinkButton>
        </div>
    </FooterTemplate>
</asp:DataList>

DataListPaging.aspx.cs

//A Class City with two Properties.
public class City
{
    private int _CityID;
    private string _CityName;

    public int CityID
    {
        get { return _CityID; }
        set { _CityID = value; }
    }

    public string CityName
    {
        get { return _CityName; }
        set { _CityName = value; }
    }
}

//Some variables to maintain Page status.
static int StartIndex = 0;
const int PageSize = 5;
static int TotalPages = 0;

//This method returns 5 records for binding based on the Start index.
List<City> GetAllCities(int _StartIndex, int _PageSize, out int TotalPages)
{
    List<City> CityList = new List<City>() { 
    new City{ CityID = 1,CityName="New Delhi"},
    new City{ CityID = 2,CityName="Mumbai"},
    new City{ CityID = 3,CityName="Kolkatta"},
    new City{ CityID = 4,CityName="Chennai"},
    new City{ CityID =5,CityName="Bangalore"},
    new City{ CityID =6,CityName="Hyderabad"},
    new City{ CityID=7,CityName="Pune"},
    new City{ CityID=8,CityName="Noida"},
    new City{ CityID=9,CityName="Ahmedabad"},
    new City{ CityID=10,CityName="Baroda"},
    new City{ CityID=11,CityName="Nagpur"},
    new City{ CityID=12,CityName="Jaipur"},
    new City{ CityID=13,CityName="Chandigarh"},
    new City{ CityID=14,CityName="Amristar"},
    new City{ CityID=15,CityName="Madurai"},
    new City{ CityID=16,CityName="Coimbatore"},
    new City{ CityID=17,CityName="Trichy"}};
    int Total = CityList.Count();
    TotalPages = (Total % PageSize) > 0 ? (Total / PageSize) : (Total / PageSize) - 1;
    return CityList.Skip(_StartIndex * _PageSize).Take(_PageSize).ToList();
}

//Binds the Data to the DataList
void BindAllCities()
{
    List<City> CityList = GetAllCities(0, PageSize, out TotalPages);
    if (CityList.Count > 0)
        dlCities.DataSource = CityList;
    else
    {
        dlCities.DataSource = null;
        dlCities.ShowFooter = false;
        dlCities.ShowHeader = false;
    }
    dlCities.DataBind();
    ManagePaging();
}

//Binding the data on Page Load
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        StartIndex = TotalPages = 0;
        BindAllCities();
    }
}

//Based on the Paging Command... DataList is binded...
protected void dlCities_ItemCommand(object sender, DataListCommandEventArgs e)
{
    if (e.CommandName == "First")
        StartIndex = 0;
    else if (e.CommandName == "Next")
        StartIndex++;
    else if (e.CommandName == "Previous")
        StartIndex--;
    else if (e.CommandName == "Last")
        StartIndex = TotalPages;
    dlCities.DataSource = GetAllCities(StartIndex, PageSize, out TotalPages);
    dlCities.DataBind();
    ManagePaging();
}

//Method to manage the Paging process on every paging command
void ManagePaging()
{
    LinkButton lbFirst = dlCities.Controls[dlCities.Controls.Count - 1].FindControl("lbFirst") as LinkButton;
    LinkButton lbPrevious = dlCities.Controls[dlCities.Controls.Count - 1].FindControl("lbPrevious") as LinkButton;
    LinkButton lbNext = dlCities.Controls[dlCities.Controls.Count - 1].FindControl("lbNext") as LinkButton;
    LinkButton lbLast = dlCities.Controls[dlCities.Controls.Count - 1].FindControl("lbLast") as LinkButton;
    if (StartIndex == 0 && StartIndex < TotalPages)
    {
        lbFirst.Enabled = lbPrevious.Enabled = false;
        lbNext.Enabled = lbLast.Enabled = true;
    }
    else if (StartIndex > 0 && StartIndex < TotalPages)
        lbFirst.Enabled = lbPrevious.Enabled = lbNext.Enabled = lbLast.Enabled = true;
    else if (StartIndex == TotalPages && StartIndex > 0)
    {
        lbFirst.Enabled = lbPrevious.Enabled = true;
        lbNext.Enabled = lbLast.Enabled = false;
    }
    else if (StartIndex == TotalPages)
        lbFirst.Enabled = lbPrevious.Enabled = lbNext.Enabled = lbLast.Enabled = false;
}

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