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Several updates & # 8594; loading and displaying one by one

I put my example code here. Please correct the error. In the sample code, I want to download the UpdatePanelBodySub1, UpdatePanelBodySub2, UpdatePanelBodySub3, and UpdatePanelBodySub4 update panels one by one. If one refreshed panel downloaded all the entries and then immediately pops up, then the next refreshed panel will start working .... Please help me. (Visual Studio 2008 and Framework 3.5)

Default.aspx

  Home - Update Panels                     

        <UsrCtrl:MainControl ID="mainControl1" runat="server" EnableViewState="true" />
    </div>
</form>

Default.aspx.cs system usage; using System.Web.UI; using System.Web.UI.WebControls;

public partial class _Default: Page {/// /// /// /// protected override void OnPreRenderComplete (EventArgs e) {TextBox txtIsSearch = (TextBox) mainControl1.FindControl ("headerControl1"). FindControl ("txtIsSearch");

    if (Convert.ToBoolean(txtIsSearch.Text))
    {
        UpdatePanel updatePanelBodySub;

        updatePanelBodySub =
            (UpdatePanel)
            mainControl1.FindControl("bodyControl1").FindControl("bodySubControl1").FindControl(
                "UpdatePanelBodySub1");
        updatePanelBodySub.DataBind();

        updatePanelBodySub =
            (UpdatePanel)
            mainControl1.FindControl("bodyControl1").FindControl("bodySubControl2").FindControl(
                "UpdatePanelBodySub2");
        updatePanelBodySub.DataBind();

        updatePanelBodySub =
            (UpdatePanel)
            mainControl1.FindControl("bodyControl1").FindControl("bodySubControl3").FindControl(
                "UpdatePanelBodySub3");
        updatePanelBodySub.DataBind();

        updatePanelBodySub =
            (UpdatePanel)
            mainControl1.FindControl("bodyControl1").FindControl("bodySubControl4").FindControl(
                "UpdatePanelBodySub4");
        updatePanelBodySub.DataBind();

        txtIsSearch.Text = "false";
    }

    base.OnPreRenderComplete(e);
}

}

MainControl.ascx

  

    <asp:UpdateProgress ID="UpdateProgressMain" runat="server" AssociatedUpdatePanelID="UpdatePanelMain" DisplayAfter="50">
        <ProgressTemplate>
            <img src="loading.gif" alt="Loading ... " title="Loading ... " />
        </ProgressTemplate>
    </asp:UpdateProgress>

    <h1>Search data from 4 different databases</h1>

    <UsrCtrl:HeaderControl ID="headerControl1" runat="server" EnableViewState="true" />

    <UsrCtrl:BodyControl ID="bodyControl1" runat="server" EnableViewState="true" />

</ContentTemplate>

MainControl.ascx.cs

using System;

public partial class MainControl: System.Web.UI.UserControl {protected void Page_Load (object sender, EventArgs e) {

}

}

HeaderControl.ascx

Search criteria



HeaderControl.ascx.cs

using System; using System.Web.UI.WebControls;

public partial class HeaderControl: System.Web.UI.UserControl {protected void Page_Load (object sender, EventArgs e) {

}
protected void btnSearch_Click(object sender, EventArgs e)
{
    TextBox txtPageNumber;

    txtPageNumber =
        (TextBox)
        this.Parent.Parent.Parent.FindControl("bodyControl1").FindControl("bodySubControl1").FindControl(
            "txtPageNumber");
    // this                         --> ASP.hedercontrol_ascx
    // this.Parent                  --> System.Web.UI.Control
    // this.Parent.Parent           --> System.Web.UI.UpdatePanel
    // this.Parent.Parent.Parent    --> ASP.maincontrol_ascx

    txtPageNumber.Text = "1";

    txtPageNumber =
        (TextBox)
        this.Parent.Parent.Parent.FindControl("bodyControl1").FindControl("bodySubControl2").FindControl(
            "txtPageNumber");
    txtPageNumber.Text = "1";

    txtPageNumber =
        (TextBox)
        this.Parent.Parent.Parent.FindControl("bodyControl1").FindControl("bodySubControl3").FindControl(
            "txtPageNumber");
    txtPageNumber.Text = "1";

    txtPageNumber =
        (TextBox)
        this.Parent.Parent.Parent.FindControl("bodyControl1").FindControl("bodySubControl4").FindControl(
            "txtPageNumber");
    txtPageNumber.Text = "1";

    txtIsSearch.Text = "true";
}

}

BodyControl.ascx

Search results







BodyControl.ascx.cs

using System;

public partial class BodyControl: System.Web.UI.UserControl {protected void Page_Load (object sender, EventArgs e) {

}

}

BodySubControl1.ascx

  

    <asp:UpdateProgress ID="UpdateProgressBodySub1" runat="server" AssociatedUpdatePanelID="UpdatePanelBodySub1" DisplayAfter="50">
        <ProgressTemplate>
            <img src="loading.gif" alt="Loading ... " title="Loading ... " />
        </ProgressTemplate>
    </asp:UpdateProgress>

    <h3>From database 1</h3>

    <asp:GridView ID="GridViewBodySub1" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField HeaderText="Search Answer" DataField="SearchAns" />
        </Columns>
    </asp:GridView>

    <asp:LinkButton ID="lnkPrevious" runat="server" Text="Previous" 
        ForeColor="Blue" onclick="lnkPrevious_Click"></asp:LinkButton>
    <asp:LinkButton ID="lnkNext" runat="server" Text="Next" ForeColor="Blue" 
        onclick="lnkNext_Click"></asp:LinkButton>
    <asp:TextBox ID="txtPageNumber" runat="server" Text="1" Visible="false"></asp:TextBox>

</ContentTemplate>

BodySubControl1.ascx.cs

using System; using System.Collections.Generic; using System.Web.UI; using System.Web.UI.WebControls;

public partial class BodySubControl1: UserControl {protected void UpdatePanel_DataBinding (object sender, EventArgs e) {GridViewBodySub1.DataSource = GetRecords (); GridViewBodySub1.DataBind (); }

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkPrevious_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    if (pageNumber > 1)
    {
        pageNumber -= 1;
    }

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub1.DataBind();
}

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkNext_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    pageNumber += 1;

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub1.DataBind();
}

/// <summary>
/// In actual case this function fetching record from database
/// For testing purpose I wrote like this.
/// </summary>
/// <returns></returns>
private List<SearchResult> GetRecords()
{
    List<SearchResult> strList = new List<SearchResult>();

    TextBox txtSearchCriteria =
        (TextBox) this.Parent.Parent.Parent.Parent.FindControl("headerControl1").FindControl("txtSearchCriteria");

    // this                                 --> ASP.bodysubcontrol1_ascx
    // this.Parent                          --> ASP.bodycontrol_ascx
    // this.Parent.Parent                   --> System.Web.UI.Control
    // this.Parent.Parent.Parent            --> System.Web.UI.UpdatePanel
    // this.Parent.Parent.Parent.Parent     --> ASP.maincontrol_ascx



    int recordNumberStart = ((Convert.ToInt32(txtPageNumber.Text) - 1) * 10) + 1;
    int recordNumberEnd = recordNumberStart + 9;

    for (int i = recordNumberStart; i <= recordNumberEnd; i++)
    {
        strList.Add(new SearchResult(string.Concat("DB1 :", txtSearchCriteria.Text.Trim(), " ", i.ToString())));
    }

    for (long i = 0; i < 999999999; i++)
    {
        // real case it will not come
    }

    return strList;
}

}

BodySubControl2.ascx

  

    <asp:UpdateProgress ID="UpdateProgressBodySub2" runat="server" AssociatedUpdatePanelID="UpdatePanelBodySub2" DisplayAfter="50">
        <ProgressTemplate>
            <img src="loading.gif" alt="Loading ... " title="Loading ... " />
        </ProgressTemplate>
    </asp:UpdateProgress>

    <h3>From database 2</h3>

    <asp:GridView ID="GridViewBodySub2" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField HeaderText="Search Answer" DataField="SearchAns" />
        </Columns>
    </asp:GridView>

    <asp:LinkButton ID="lnkPrevious" runat="server" Text="Previous" 
        ForeColor="Blue" onclick="lnkPrevious_Click"></asp:LinkButton>
    <asp:LinkButton ID="lnkNext" runat="server" Text="Next" ForeColor="Blue" 
        onclick="lnkNext_Click"></asp:LinkButton>
    <asp:TextBox ID="txtPageNumber" runat="server" Text="1" Visible="false"></asp:TextBox>

</ContentTemplate>

BodySubControl2.ascx.cs

using System; using System.Collections.Generic; using System.Web.UI; using System.Web.UI.WebControls;

public partial class BodySubControl2: UserControl {protected void UpdatePanel_DataBinding (object sender, EventArgs e) {GridViewBodySub2.DataSource = GetRecords (); GridViewBodySub2.DataBind (); }

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkPrevious_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    if (pageNumber > 1)
    {
        pageNumber -= 1;
    }

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub2.DataBind();
}

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkNext_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    pageNumber += 1;

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub2.DataBind();
}

/// <summary>
/// In actual case this function fetching record from database
/// For testing purpose I wrote like this.
/// </summary>
/// <returns></returns>
private List<SearchResult> GetRecords()
{
    List<SearchResult> strList = new List<SearchResult>();

    TextBox txtSearchCriteria =
        (TextBox)this.Parent.Parent.Parent.Parent.FindControl("headerControl1").FindControl("txtSearchCriteria");

    // this                                 --> ASP.bodysubcontrol2_ascx
    // this.Parent                          --> ASP.bodycontrol_ascx
    // this.Parent.Parent                   --> System.Web.UI.Control
    // this.Parent.Parent.Parent            --> System.Web.UI.UpdatePanel
    // this.Parent.Parent.Parent.Parent     --> ASP.maincontrol_ascx



    int recordNumberStart = ((Convert.ToInt32(txtPageNumber.Text) - 1) * 10) + 1;
    int recordNumberEnd = recordNumberStart + 9;

    for (int i = recordNumberStart; i <= recordNumberEnd; i++)
    {
        strList.Add(new SearchResult(string.Concat("DB2 :", txtSearchCriteria.Text.Trim(), " ", i.ToString())));
    }

    for (long i = 0; i < 999999999; i++)
    {
        // real case it will not come
    }

    return strList;
}

}

BodySubControl3.ascx

  

    <asp:UpdateProgress ID="UpdateProgressBodySub3" runat="server" AssociatedUpdatePanelID="UpdatePanelBodySub3" DisplayAfter="50">
        <ProgressTemplate>
            <img src="loading.gif" alt="Loading ... " title="Loading ... " />
        </ProgressTemplate>
    </asp:UpdateProgress>

    <h3>From database 3</h3>

    <asp:GridView ID="GridViewBodySub3" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField HeaderText="Search Answer" DataField="SearchAns" />
        </Columns>
    </asp:GridView>

    <asp:LinkButton ID="lnkPrevious" runat="server" Text="Previous" 
        ForeColor="Blue" onclick="lnkPrevious_Click"></asp:LinkButton>
    <asp:LinkButton ID="lnkNext" runat="server" Text="Next" ForeColor="Blue" 
        onclick="lnkNext_Click"></asp:LinkButton>
    <asp:TextBox ID="txtPageNumber" runat="server" Text="1" Visible="false"></asp:TextBox>

</ContentTemplate>

BodySubControl3.ascx.cs

using System; using System.Collections.Generic; using System.Web.UI; using System.Web.UI.WebControls;

public partial class BodySubControl3: UserControl {protected void UpdatePanel_DataBinding (object sender, EventArgs e) {GridViewBodySub3.DataSource = GetRecords (); GridViewBodySub3.DataBind (); }

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkPrevious_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    if (pageNumber > 1)
    {
        pageNumber -= 1;
    }

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub3.DataBind();
}

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkNext_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    pageNumber += 1;

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub3.DataBind();
}

/// <summary>
/// In actual case this function fetching record from database
/// For testing purpose I wrote like this.
/// </summary>
/// <returns></returns>
private List<SearchResult> GetRecords()
{
    List<SearchResult> strList = new List<SearchResult>();

    TextBox txtSearchCriteria =
        (TextBox)this.Parent.Parent.Parent.Parent.FindControl("headerControl1").FindControl("txtSearchCriteria");

    // this                                 --> ASP.bodysubcontrol3_ascx
    // this.Parent                          --> ASP.bodycontrol_ascx
    // this.Parent.Parent                   --> System.Web.UI.Control
    // this.Parent.Parent.Parent            --> System.Web.UI.UpdatePanel
    // this.Parent.Parent.Parent.Parent     --> ASP.maincontrol_ascx



    int recordNumberStart = ((Convert.ToInt32(txtPageNumber.Text) - 1) * 10) + 1;
    int recordNumberEnd = recordNumberStart + 9;

    for (int i = recordNumberStart; i <= recordNumberEnd; i++)
    {
        strList.Add(new SearchResult(string.Concat("DB3 :", txtSearchCriteria.Text.Trim(), " ", i.ToString())));
    }

    for (long i = 0; i < 999999999; i++)
    {
        // real case it will not come
    }

    return strList;
}

}

BodySubControl4.ascx

  

    <asp:UpdateProgress ID="UpdateProgressBodySub4" runat="server" AssociatedUpdatePanelID="UpdatePanelBodySub4" DisplayAfter="50">
        <ProgressTemplate>
            <img src="loading.gif" alt="Loading ... " title="Loading ... " />
        </ProgressTemplate>
    </asp:UpdateProgress>

    <h3>From database 4</h3>

    <asp:GridView ID="GridViewBodySub4" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField HeaderText="Search Answer" DataField="SearchAns" />
        </Columns>
    </asp:GridView>

    <asp:LinkButton ID="lnkPrevious" runat="server" Text="Previous" 
        ForeColor="Blue" onclick="lnkPrevious_Click"></asp:LinkButton>
    <asp:LinkButton ID="lnkNext" runat="server" Text="Next" ForeColor="Blue" 
        onclick="lnkNext_Click"></asp:LinkButton>
    <asp:TextBox ID="txtPageNumber" runat="server" Text="1" Visible="false"></asp:TextBox>

</ContentTemplate>

BodySubControl4.ascx.cs

using System; using System.Collections.Generic; using System.Web.UI; using System.Web.UI.WebControls;

public partial class BodySubControl4: UserControl {protected void UpdatePanel_DataBinding (object sender, EventArgs e) {GridViewBodySub4.DataSource = GetRecords (); GridViewBodySub4.DataBind (); }

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkPrevious_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    if (pageNumber > 1)
    {
        pageNumber -= 1;
    }

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub4.DataBind();
}

/// <summary>
/// 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lnkNext_Click(object sender, EventArgs e)
{
    int pageNumber = Convert.ToInt32(txtPageNumber.Text);

    pageNumber += 1;

    txtPageNumber.Text = Convert.ToString(pageNumber);

    UpdatePanelBodySub4.DataBind();
}

/// <summary>
/// In actual case this function fetching record from database
/// For testing purpose I wrote like this.
/// </summary>
/// <returns></returns>
private List<SearchResult> GetRecords()
{
    List<SearchResult> strList = new List<SearchResult>();

    TextBox txtSearchCriteria =
        (TextBox)this.Parent.Parent.Parent.Parent.FindControl("headerControl1").FindControl("txtSearchCriteria");

    // this                                 --> ASP.bodysubcontrol4_ascx
    // this.Parent                          --> ASP.bodycontrol_ascx
    // this.Parent.Parent                   --> System.Web.UI.Control
    // this.Parent.Parent.Parent            --> System.Web.UI.UpdatePanel
    // this.Parent.Parent.Parent.Parent     --> ASP.maincontrol_ascx



    int recordNumberStart = ((Convert.ToInt32(txtPageNumber.Text) - 1) * 10) + 1;
    int recordNumberEnd = recordNumberStart + 9;

    for (int i = recordNumberStart; i <= recordNumberEnd; i++)
    {
        strList.Add(new SearchResult(string.Concat("DB4 :", txtSearchCriteria.Text.Trim(), " ", i.ToString())));
    }

    for (long i = 0; i < 999999999; i++)
    {
        // real case it will not come
    }

    return strList;
}

}

SearchResult.cs

/// /// Short description for SearchResult /// public class SearchResult {/// /// Private variable /// private string _SearchAns;

/// <summary>
/// Property
/// </summary>
public string SearchAns
{
    get
    {
        return _SearchAns;
    }
    set
    {
        _SearchAns = value;
    }
}

/// <summary>
/// Constructor
/// </summary>
/// <param name="CurrentSeachAns"></param>
public SearchResult(string CurrentSeachAns)
{
    _SearchAns = CurrentSeachAns;
}

}

web.config

Asp.Net customization option in Visual Studio. A complete list of settings and comments can be found in machine.config.comments usually located in \ Windows \ Microsoft.Net \ Framework \ v2.x \ Config -> Allows configuration of the security authentication mode used by ASP.NET to authenticate the incoming user. -> Allows configuration on what to do if / when an unhandled error occurs during query execution. In particular,it allows developers to customize the html error pages to display instead of the error stack trace.

    <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
        <error statusCode="403" redirect="NoAccess.htm" />
        <error statusCode="404" redirect="FileNotFound.htm" />
    </customErrors>
    -->
    <pages>
        <controls>
            <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        </controls>
    </pages>
    <httpHandlers>
        <remove verb="*" path="*.asmx"/>
        <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
    </httpHandlers>
    <httpModules>
        <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    </httpModules>
</system.web>
<system.codedom>
    <compilers>
        <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
            <providerOption name="CompilerVersion" value="v3.5"/>
            <providerOption name="WarnAsError" value="false"/>
        </compiler>
        <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" warningLevel="4" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
            <providerOption name="CompilerVersion" value="v3.5"/>
            <providerOption name="OptionInfer" value="true"/>
            <providerOption name="WarnAsError" value="false"/>
        </compiler>
    </compile
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1 answer


Should it be refresh panels? If it were me, I would use jQuery and (ideally) MVC; then it's pretty simple, like something like:

$('#div1').load(url1, function() {
    $('#div2').load(url2, function() {
        $('#div3').load(url3, function() {
            $('#div4').load(url4);
        });
    });
});


i.e. we use a callback from each to start the next div loading, but treat each div as an unbound request.

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