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8.2

datagrid paging not working

Asked by Grimrist in C# Programming Language

Tags: C#

When I run this function it retrieves all the values required. Then when I click to the next page the values do not show. Also my numbering scheme is not working for navigating the dataset.

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/////////////////////////////Default.aspx//////////////////
<%@ Page Language="C#" MasterPageFile="~/masterpages/LeftColumn.master" AutoEventWireup="true" CodeFile="default.aspx.cs" Inherits="Default" Title="Intake Search" %>
 
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlace_Text" Runat="Server">
    <style type="text/css">
   .selectedPage a
   {
   font-weight:bold;
   color:red;
   }
   </style>
    <%--<asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:UpdatePanel ID="up1" runat="server">
            <ContentTemplate>--%>
            
    <asp:TextBox ID="txtSearch" runat="server" />
    <asp:Button ID="btnSearch" runat="server" onClick="btnSearching_Click" Text="Search" />
    <asp:Label ID="lblError" Text="Leave Blank for now..."  Font-Italic ="true" runat="server" /><br />
    <asp:Label ID="Label2" runat="server" Text="Search by Intake Date?"></asp:Label>
    <asp:CheckBox ID="chkDate" runat="server" /><br />
    <asp:Label ID="lblBeginDate" width="70px" Text="Start Date:" runat="server" /><asp:TextBox ID="txtBegin" width="100px" runat="server" /><br />
    <asp:Label ID="lblEndDate" width="70px" Text="End Date:" runat="server" /><asp:TextBox ID="txtEnd" width="100px" runat="server" /><br />
    <asp:Label ID="Label1" text="Search by Offense?" runat="server"></asp:Label>
    <asp:CheckBox ID="chkOffense" runat="server" /><br />
    <asp:DropDownList ID="ddOffense" runat="server" DataSourceID="srcOffense" 
        DataTextField="Offense" DataValueField="OffenseID">
    </asp:DropDownList>
    <%--
     </ContentTemplate>        
        </asp:UpdatePanel>
        
    <asp:UpdateProgress
         ID="progress1"
         AssociatedUpdatePanelID="up1"
         runat="server">
        <ProgressTemplate>
            <div class="progress">
                <asp:Image
                id="imgProgress"
                ImageURL="~/Images/Progress.gif"
                Runat="server" />
                Retrieving content...
            </div>
        </ProgressTemplate>
    </asp:UpdateProgress>--%>
    
    
    <div style="float:right">
        <asp:Calendar ID="Calendar1" runat="server" />
        <asp:Calendar ID="Calendar2" runat="server" />
    </div>
   
<asp:ScriptManager ID="ScriptManager1" runat="server" />
 
<asp:UpdatePanel ID="up1" runat="server">
<ContentTemplate>
        
<asp:GridView
    ID="grdResults"
    runat="server"
    AllowPaging="True"
    AllowSorting="true"
    AutoGenerateColumns="False"   
    OnPageIndexChanging="grdResults_PageIndexChanging" 
    EmptyDataText = "No Matching Results..."
    PageSize="8"
    OnDataBound="grdResults_DataBound">
    <PagerTemplate>
    <table>
    <tr><td>
    <asp:LinkButton
    id="lnkPrevious"
    Text="&lt; Prev"
    CommandName="Page"
    CommandArgument="Prev"
    ToolTip="Previous Page"
    Runat="server"/>
    </td><td>
    
    <asp:Menu
    id="menuPager"
    Orientation="Horizontal" 
    OnMenuItemClick="menuPager_MenuItemClick"
    StaticSelectedStyle-CssClass="selectedPage"
    CssClass="menu"
    runat="server" />
    
    </td><td>
    <asp:LinkButton
    id="lnkNext"
    Text="Next &gt;"
    CommandName="Page"
    CommandArgument="Next"
    ToolTip="Next Page"
    Runat="server" />
    </td></tr>
    </table>
    </PagerTemplate>
 
    <Columns>
    <asp:HyperLinkField
    DataNavigateUrlFields="StudentID"
    DataNavigateUrlFormatString="StudentInfo.aspx?StudentID={0}"
    Text="Details" />
   
    
    <asp:BoundField DataField="FirstName"
    HeaderText="First Name" 
    SortExpression="FirstName" />
    <asp:BoundField DataField="LastName"
    HeaderText="Last Name" 
    SortExpression="LastName" />
    <asp:BoundField DataField="Offense"
    HeaderText="Offense" 
    SortExpression="Offense" />
    <asp:BoundField DataField="DateOfIntake" 
    HeaderText="Date Of Intake" 
    SortExpression="DateOfIntake" />
    </Columns>
 
</asp:GridView>
 </ContentTemplate>
 </asp:UpdatePanel>
 
                <asp:ObjectDataSource
                 ID="SearchDS"
                 EnableCaching="true"
                 runat="server"
                 SelectMethod="Searching"
                 TypeName="SearchDataDAL">
                    <SelectParameters>
                        <asp:Parameter Name="offenseID" Type="Int32" />
                        <asp:Parameter Name="queryID" Type="Int32" />
                        <asp:Parameter Name="intakeDateBegin" Type="String" />
                        <asp:Parameter Name="intakeDateEnd" Type="String" />
                    </SelectParameters>
                </asp:ObjectDataSource> 
    
        <asp:SqlDataSource ID="srcOffense"
        runat="server" 
        ConnectionString="<%$ ConnectionStrings:ProjectExcel_BAKConnectionString %>" 
        SelectCommand="sp_GetOffenses" SelectCommandType="StoredProcedure">
        
        <%--<UpdateParameters>
        <asp:Parameter Name="queryID" Type="Int32" />
        <asp:Parameter Name="offenseID" Type="Int32" />
        <asp:Parameter Name="intakeDateBegin" Type="DateTime" />
        <asp:Parameter Name="intakeDateEnd" Type="DateTime" />        
        </UpdateParameters>
        
        <InsertParameters>
        <asp:Parameter Name="queryID" Type="Int32" />
        <asp:Parameter Name="offenseID" Type="Int32" />
        <asp:Parameter Name="intakeDateBegin" Type="DateTime" />
        <asp:Parameter Name="intakeDateEnd" Type="DateTime" />          
        </InsertParameters>--%>
        
        </asp:SqlDataSource>  
</asp:Content>
 
/////////////////////////////////default.aspx.cs////////////////
 
 
 
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.Linq;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.Configuration;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text;
using System.ComponentModel;
using System.Data.SqlClient;
 
 
 
public partial class Default : System.Web.UI.Page
{
    int queryID = 0;
    int offenseID = 0;
    string intakeDateBegin = "";    
    string intakeDateEnd = "";
    string lastName = "";
    int gridID = 0;
    DataView dvIntakes;
    DataTable dtblIntakes;
 
 
    protected void Page_PreInit(object sender, EventArgs e)
    {
 
 
    }
 
    protected void Page_Load()
    {
 
        
 
        if (grdResults.PageCount == 0)
        {
        }
        else
        {
            //grdResults.DataSource = GetIntakesFromDB();
            //grdResults.DataMember = "items";
            //grdResults.DataBind();
        }
        
 
 
 
        // DO NOT DELETE, THIS MAKES TABLE DYNAMICALLY
 
        //// Create the DataTable columns
        //DataTable newDataTable = new DataTable();
        //newDataTable.Columns.Add("Details", typeof(int));
        //newDataTable.Columns.Add("First Name", typeof(string));
        //newDataTable.Columns.Add("Last Name", typeof(string));
        //newDataTable.Columns.Add("Offense", typeof(string));
        //newDataTable.Columns.Add("Date of Intake", typeof(DateTime));
 
 
        //// mark the id column as an autoincrement column
        //newDataTable.Columns["Details"].AutoIncrement = true;
 
        //// add some data rows
        //for (int i = 1; i < 11; i++)
        //{
        //    DataRow newRow = newDataTable.NewRow();
        //    newRow["First Name"] = "Product " + i.ToString();
        //    newRow["Last Name"] = "Kinney";
        //    newDataTable.Rows.Add(newRow);
        //}
 
        //// Bind table to DataGrid
        //grdResults.DataSource = newDataTable;
        //grdResults.DataBind();
    }
 
 
    protected void btnSearching_Click(object sender, EventArgs e)
    {
        
        if (queryID > 0)
        {
        }
        else
        {
 
            if (chkOffense.Checked == true)
            { queryID = 1;Session["queryID"] = queryID;}
            if (chkDate.Checked == true)
            { queryID = 2; Session["queryID"] = queryID; }
            if (chkOffense.Checked & chkDate.Checked == true)
            { queryID = 3; Session["queryID"] = queryID; }
            if (txtSearch.Text.Length > 0)
            { queryID = 4; Session["queryID"] = queryID; }
            if (txtSearch.Text.Length > 0 & chkOffense.Checked == true)
            { queryID = 5; Session["queryID"] = queryID; }
 
            // declare session parameters for stored procedure
            Session["offenseID"]  = ddOffense.SelectedIndex;
            Session["lastName"] = txtSearch.Text;
            Session["intakeDateBegin"] = txtBegin.Text;
            Session["intakeDateEnd"] =txtEnd.Text;
 
 
            switch (Convert.ToInt32(Session["queryID"]))
            {
                case (0):
                    Response.Write("This is queryID0 speaking...");
                    break;
                case (1):
                    Response.Write("This is queryID1 speaking...");
                    break;
                case (2):
                    Response.Write("This is queryID2 speaking...");
                    break;
                case (3):
                    Response.Write("This is queryID3 speaking...");
                    break;
                case (4):
                    Response.Write("This is queryID4 speaking...");
                    break;
                case (5):
                    Response.Write("This is queryID5 speaking...");
                    break;
 
            }
 
            dvIntakes = (DataView)Session["Intakes"];
 
 
 
            SqlConnection myConn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ProjectExcel_BAKConnectionString"].ConnectionString);
            SqlCommand cmd = new SqlCommand();
 
 
            cmd.Parameters.AddWithValue("@queryID", Session["queryID"]);
            SqlDataAdapter dad = new SqlDataAdapter("sp_Search", myConn);
 
            dad.SelectCommand.CommandType = CommandType.StoredProcedure;
 
            dad.SelectCommand.Parameters.Add(new SqlParameter("@queryID", Session["queryID"]));
            dad.SelectCommand.Parameters.AddWithValue("@offenseID", Session["offenseID"]);
            if (Session["intakeDateBegin"] == null)
                dad.SelectCommand.Parameters.Add(new SqlParameter("@IntakeDateBegin", Session["intakeDateBegin"]));
            else
                dad.SelectCommand.Parameters.Add(new SqlParameter("@IntakeDateBegin", ""));
            if (txtEnd.Text == null)
                dad.SelectCommand.Parameters.Add(new SqlParameter("@IntakeDateEnd", ""));
            else
                dad.SelectCommand.Parameters.Add(new SqlParameter("@IntakeDateEnd", Session["intakeDateEnd"]));
 
            if (Session["lastname"] == null)
                dad.SelectCommand.Parameters.Add(new SqlParameter("@lastName", ""));
            else
                dad.SelectCommand.Parameters.Add(new SqlParameter("@lastName", Session["lastName"]));
 
 
            DataTable dtblIntakes = new DataTable();
            dad.Fill(dtblIntakes);
            dvIntakes = new DataView(dtblIntakes);
            Session["Intakes"] = dvIntakes;
           
 
            grdResults.DataSource = dtblIntakes;
            grdResults.DataBind();
        }
 
    }
 
 
 
    protected void grdResults_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        if (!IsPostBack == true)
 
 
        
        // handle out of bounds
        
        grdResults.DataSource = dtblIntakes;
        grdResults.PageIndex = e.NewPageIndex;
        grdResults.DataBind();
 
    }
    protected DataView SortDataTable(DataTable dataTable, bool isPageIndexChanging)
    {
        if (dataTable != null)
        {
            DataView dataView = new DataView(dataTable);
            if (GridViewSortExpression != string.Empty)
            {
                if (isPageIndexChanging)
                {
                    dataView.Sort = string.Format("{0} {1}", GridViewSortExpression, GridViewSortDirection);
                }
                else
                {
                    dataView.Sort = string.Format("{0} {1}", GridViewSortExpression, GetSortDirection());
                }
            }
            return dataView;
        }
        else
        {
            return new DataView();
        }
 
    }
 
    protected void menuPager_MenuItemClick(object sender, MenuEventArgs e)
    {
        grdResults.PageIndex = Int32.Parse(e.Item.Value);
    }
    
    private string GridViewSortExpression
    {
        get { return ViewState["SortExpression"] as string ?? string.Empty; }
        set { ViewState["SortExpression"] = value; }
    }
    private string GridViewSortDirection
    {
        get { return ViewState["SortDirection"] as string ?? "ASC"; }
        set { ViewState["SortDirection"] = value; }
    }
 
    private string GetSortDirection()
    {
        switch (GridViewSortDirection)
        {
           case "ASC":
               GridViewSortDirection = "DESC";
                break;
 
            case "DESC":
                GridViewSortDirection = "ASC";
                break;
        }
 
        return GridViewSortDirection;
    }
    // produces numbering system for records
    protected void grdResults_DataBound(object sender, EventArgs e)
    {
        if (grdResults.PageCount > 1)
        {
            Menu menuPager = (Menu)grdResults.BottomPagerRow.FindControl("menuPager");
            for (int i = 0; i < grdResults.PageCount; i++)
            {
                MenuItem item = new MenuItem();
                item.Text = String.Format("", i + 1);
                item.Value = i.ToString();
                if (grdResults.PageIndex == i)
                    item.Selected = true;
                menuPager.Items.Add(item);
            }
        }
        else
        {
 
        }
    }
}
 
Related Solutions
Keywords: datagrid paging not working
Title
1 NEED better query for paging purposes
 
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[+][-]05/23/08 02:20 PM, ID: 21635917Accepted Solution

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Zone: C# Programming Language
Tags: C#
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Solution Provided By: Grimrist
Participating Experts: 1
Solution Grade: A
 
[+][-]05/23/08 02:21 PM, ID: 21635924Author Comment

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[+][-]05/24/08 07:29 PM, ID: 21641066Expert Comment

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[+][-]05/26/08 07:01 PM, ID: 21648980Author Comment

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