Re: explanation of when need to repopulate control

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I have figured the cause of the problem, sort of. My main control was being
loaded dynamically during a custom data list control's ItemDataBound event,
and then added to the e.item.controls collection. Once I removed it from
here, the correct event was called in my control. the problem is i need to
keep it where it is because of the way the page works.

I tried to add INamingContainer to the custom Datalist, but that didn't
help. Any ideas what could make this happen?

thanks so much, i know i'm being a pain, but i'm stuck!

This is the custom DataLists' event:
protected override void OnItemDataBound(DataListItemEventArgs e)

{

base.OnItemDataBound(e);

Parameter parameter = (Parameter)e.Item.DataItem;

try

{

Control control;

if(parameter.Type == ParameterType.Control)

control = this.Page.LoadControl(parameter.ControlPath);

else

{

Assembly assembly = parameter.Assembly;

if(assembly == null)

{

// The control didn't declare its own assembly, so use the report's
ControlsAssembly

assembly = this.ControlsAssembly;

// Ther report's ControlsAssembly is null, so use current page's assembly

if(assembly == null)

assembly = this.Page.GetType().BaseType.Assembly;

}


control = (Control) assembly.CreateInstance(parameter.ControlTypeName);

}

control.ID = parameter.Name;

// Set up all the properties of this control from the parameter.properties

foreach(DictionaryEntry de in parameter.Properties)

SetProperty(de.Key.ToString(), de.Value.ToString(), control);


e.Item.Controls.Add(control);

}

catch (Exception ex)

{

throw new ApplicationException("Unable to render criteria. Reason: " +
ex.Message, ex);

}

}

"TS" <manofsteele1@xxxxxxxxxxxxx> wrote in message
news:unRs%23YGmFHA.3960@xxxxxxxxxxxxxxxxxxxxxxx
> In testing, i removed the main parent dropdown and only left the 2 below
it.
> this time, the same scenario happened...when the child dropdown list
> autopostsback, it's immediate parent's selectedindexchanged event fires! I
'm
> starting to pull my hair out now...I"m stuck!
>
> please help superman
>
> "TS" <manofsteele1@xxxxxxxxxxxxx> wrote in message
> news:eNZro3FmFHA.1948@xxxxxxxxxxxxxxxxxxxxxxx
> > Another problem:
> >
> > while i'm waiting on your remark to my last post, i removed the sub
> > composite controls from my composite control so that there is only drop
> down
> > lists on it. During CreateChildcontrols, i load the main drop down using
> > databind. When the page is sent to browser for the first time, i have my
> > main drop down filled. I then select an item and its
SelectedIndexChanged
> > fires and populates the send drop down list. Then when i select an item
> from
> > it, it posts back, and the event that gets called is the main(first)
> > dropdown list's SelectedIndexChanged event, which then re-populates the
> > second drop down list, then the control returns to the browser (The
> > SelectedIndexChanged event never fired for the 2nd dropdown's changed
> > event.???
> >
> > thanks again
> >
> > using System;
> >
> > using System.Collections.Specialized;
> >
> > using System.Web.UI;
> >
> > using System.Web.UI.WebControls;
> >
> > using System.Text;
> >
> > using OperationsTeams.Business;
> >
> > using OperationsTeams.Data;
> >
> > using OperationsTeams.Reporting;
> >
> > using OperationsTeams.Reporting.WebControls;
> >
> > namespace OperationsTeams.Web.ReportControls
> >
> > {
> >
> > /// <summary>
> >
> > /// Summary description for FiscalAgentHierarchy.
> >
> > /// </summary>
> >
> > public class FiscalAgentHierarchy : WebControl, IReportParameterControl,
> > INamingContainer
> >
> > {
> >
> > public FiscalAgentHierarchy()
> >
> > {
> >
> > Parameters.Add(new Parameter("@SchoolYear"));
> >
> > Parameters.Add(new Parameter("@ReportingGroup"));
> >
> > Parameters.Add(new Parameter("@FiscalAgentID"));
> >
> > Parameters.Add(new Parameter("@FundingSourceID"));
> >
> > Parameters.Add(new Parameter("@ProviderID"));
> >
> > Parameters.Add(new Parameter("@SiteID"));
> >
> > Parameters.Add(new Parameter("@ClassID"));
> >
> > Parameters["@SchoolYear"].Value = 2006;
> >
> > }
> >
> >
> > #region Events
> >
> > protected override void OnLoad(EventArgs e)
> >
> > {
> >
> > base.OnLoad (e);
> >
> >
> > // The last state of controls from viewstate is now loaded (Before the
> > client data is processed)
> >
> > }
> >
> >
> > protected override void OnPreRender(EventArgs e)
> >
> > {
> >
> > base.OnPreRender (e);
> >
> > // The controls now have the client values from the the last postback
> >
> > // ddlFundingSource.Visible = FundingSourceVisible;
> >
> > // ddlProviders.Visible = ProviderVisible;
> >
> > // ddlSites.Visible = SiteVisible;
> >
> > // ddlClasses.Visible = ClassVisible;
> >
> > // ddlSites.Items.Add(new ListItem("help","1"));
> >
> > // ddlSites.Items.Add(new ListItem("me","2"));
> >
> > // ddlSites.Visible = true;
> >
> > }
> >
> > private void rysReportingYearSelector_ReportingYearChanged(object
sender,
> > EventArgs e)
> >
> > {
> >
> > // this.LoadFundingSource();
> >
> > // this.LoadProviders();
> >
> > }
> >
> > private void fasFiscalAgent_FiscalAgentChanged(object sender, EventArgs
e)
> >
> > {
> >
> > this.LoadFundingSource();
> >
> > this.LoadProviders();
> >
> > }
> >
> > private void ddlFundingSource_SelectedIndexChanged(object sender,
> EventArgs
> > e)
> >
> > {
> >
> > LoadSites();
> >
> > }
> >
> > private void ddlProviders_SelectedIndexChanged(object sender, EventArgs
e)
> >
> > {
> >
> > LoadSites();
> >
> > }
> >
> > private void ddlSites_SelectedIndexChanged(object sender, EventArgs e)
> >
> > {
> >
> > LoadClasses();
> >
> > }
> >
> > #endregion
> >
> > protected override void CreateChildControls()
> >
> > {
> >
> > this.ddlFundingSource = new DropDownList();
> >
> > this.ddlProviders = new DropDownList();
> >
> > this.ddlSites = new DropDownList();
> >
> > this.ddlClasses = new DropDownList();
> >
> > ddlFundingSource.ID = FundingSourceControlId;
> >
> > ddlProviders.ID = ProvidersControlId;
> >
> > ddlSites.ID = SitesControlId;
> >
> > ddlClasses.ID = ClassesControlId;
> >
> >
> > LoadProviders();
> >
> > // start containing table
> >
> > this.Controls.Add(WebHelper.MakeLiteral("<table cellpadding=0
> > cellspacing=0><tr><td>"));
> >
> >
> > this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>"));
> >
> > // this.Controls.Add(rysReportingYearSelector);
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>"));
> >
> > // this.Controls.Add(fasFiscalAgent);
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Funding
> > Source</td><td>"));
> >
> > this.Controls.Add(ddlFundingSource);
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));
> >
> >
>
this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Providers</td><td>")
> > );
> >
> > this.Controls.Add(ddlProviders);
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));
> >
> >
this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Sites</td><td>"));
> >
> > this.Controls.Add(ddlSites);
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr><tr><td>"));
> >
> >
>
this.Controls.Add(WebHelper.MakeLiteral("<table><tr><td>Classes</td><td>"));
> >
> > this.Controls.Add(ddlClasses);
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > // end containing table
> >
> > this.Controls.Add(WebHelper.MakeLiteral("</td></tr></table>"));
> >
> > ddlFundingSource.SelectedIndexChanged += new
> > EventHandler(ddlFundingSource_SelectedIndexChanged);
> >
> > ddlProviders.SelectedIndexChanged += new
> > EventHandler(ddlProviders_SelectedIndexChanged);
> >
> > ddlSites.SelectedIndexChanged += new
> > EventHandler(ddlSites_SelectedIndexChanged);
> >
> > ddlFundingSource.AutoPostBack = ddlProviders.AutoPostBack =
> > ddlSites.AutoPostBack = true;
> >
> >
> > }
> >
> > private void LoadFundingSource()
> >
> > {
> >
> > int fiscalAgentId = 1;//this.fasFiscalAgent.SelectedFiscalAgentId;
> >
> >
> > if(fiscalAgentId != int.MinValue)
> >
> > {
> >
> > FundingSourceVisible = true;
> >
> > this.ddlFundingSource.DataSource =
FiscalAgentFunding.Find(fiscalAgentId);
> >
> > this.ddlFundingSource.DataTextField = "ShortDescription";
> >
> > this.ddlFundingSource.DataValueField = "CodeId";
> >
> > this.ddlFundingSource.DataBind();
> >
> > if(this.ddlFundingSource.Items.Count > 1)
> >
> > this.ddlFundingSource.Items.Insert(0, new ListItem(string.Empty,
> > string.Empty));
> >
> > }
> >
> > else
> >
> > {
> >
> > FundingSourceVisible = false;
> >
> > }
> >
> > }
> >
> > private void LoadProviders()
> >
> > {
> >
> > int fiscalAgentId = 1;//fasFiscalAgent.SelectedFiscalAgentId;
> >
> > if(fiscalAgentId != int.MinValue)
> >
> > {
> >
> > // ddlSites.Items.Add(new ListItem("help","1"));
> >
> > // ddlSites.Items.Add(new ListItem("me","2"));
> >
> >
> >
> > ProviderVisible = true;
> >
> > // are these dates correct???????????????????????????
> >
> > ddlProviders.DataSource = FiscalAgentProvider.Find(fiscalAgentId, new
> > DateTime(2005,7,1), new
> > DateTime(2006,6,30));//rysReportingYearSelector.ReportingYearStartDate,
> > rysReportingYearSelector.ReportingYearEndDate); //
> >
> > ddlProviders.DataTextField = "ProviderName";
> >
> > ddlProviders.DataValueField = "ProviderId";
> >
> > ddlProviders.DataBind();
> >
> > ddlProviders.Items.Insert(0, new ListItem(string.Empty, string.Empty));
> >
> > }
> >
> > else
> >
> > {
> >
> > this.ddlProviders.Items.Clear();
> >
> > ProviderVisible = false;
> >
> > }
> >
> > // LoadSites();
> >
> > }
> >
> > private void LoadSites()
> >
> > {
> >
> > if(ddlProviders.SelectedValue != string.Empty)
> >
> > {
> >
> > // Load the Site search parameters.
> >
> > SiteFindArgs siteFindArgs=new SiteFindArgs();
> >
> > siteFindArgs.FiscalAgentId=1;
> > //Convert.ToInt32(fasFiscalAgent.SelectedFiscalAgentId);
> >
> > SiteVisible = true;
> >
> > ddlSites.DataSource = Business.Site.Find(siteFindArgs);
> >
> > ddlSites.DataTextField = "Name";
> >
> > ddlSites.DataValueField = "SiteId";
> >
> > ddlSites.DataBind();
> >
> > ddlSites.Items.Insert(0, new ListItem(string.Empty, string.Empty));
> >
> > }
> >
> > else
> >
> > {
> >
> > ddlSites.Items.Clear();
> >
> > SiteVisible = false;
> >
> > }
> >
> > // LoadClasses();
> >
> > }
> >
> > private void LoadClasses()
> >
> > {
> >
> > if(ddlSites.SelectedValue != string.Empty)
> >
> > {
> >
> > AdultEdClassFindArgs adultEdClassFindArgs = new AdultEdClassFindArgs();
> >
> > // adultEdClassFindArgs.FiscalAgentId =
> > Convert.ToInt32(fasFiscalAgent.SelectedFiscalAgentId);
> >
> > // adultEdClassFindArgs.ReportingYearStartDate =
> > rysReportingYearSelector.ReportingYearStartDate;
> >
> > // adultEdClassFindArgs.ReportingYearEndDate =
> > rysReportingYearSelector.ReportingYearEndDate;
> >
> > // adultEdClassFindArgs.ProviderName = ddlProviders.SelectedValue;
> >
> > // adultEdClassFindArgs.SiteName = ddlSites.SelectedValue;
> >
> >
> > ClassVisible = true;
> >
> > ddlClasses.DataSource = AdultEdClass.Find(adultEdClassFindArgs);
> >
> > ddlClasses.DataTextField = "Name";
> >
> > ddlClasses.DataValueField = "ClassId";
> >
> > ddlClasses.DataBind();
> >
> > ddlClasses.Items.Insert(0, new ListItem(string.Empty, string.Empty));
> >
> > }
> >
> > else
> >
> > {
> >
> > ddlClasses.Items.Clear();
> >
> > ClassVisible = false;
> >
> > }
> >
> > }
> >
> >
> >
> > #region Public Properties
> >
> > #region IReportParameterControl Members
> >
> > public object ParameterValue
> >
> > {
> >
> > get{ return null; }
> >
> > set{ /*do nothing */ }
> >
> > }
> >
> > public ParameterCollection Parameters
> >
> > {
> >
> > get{ return parameters; }
> >
> > set{ parameters = value;}
> >
> > }
> >
> > #endregion
> >
> > protected bool FundingSourceVisible
> >
> > {
> >
> > get
> >
> > {
> >
> > if(ViewState["FundingSourceVisible"] == null)
> >
> > {
> >
> > return false;
> >
> > }
> >
> > return (bool)ViewState["FundingSourceVisible"];
> >
> > }
> >
> > set
> >
> > {
> >
> > TrackViewState();
> >
> > ViewState["FundingSourceVisible"] = value;
> >
> > }
> >
> > }
> >
> > protected bool ProviderVisible
> >
> > {
> >
> > get
> >
> > {
> >
> > if(ViewState["ProviderVisible"] == null)
> >
> > {
> >
> > return false;
> >
> > }
> >
> > return (bool)ViewState["ProviderVisible"];
> >
> > }
> >
> > set
> >
> > {
> >
> > TrackViewState();
> >
> > ViewState["ProviderVisible"] = value;
> >
> > }
> >
> > }
> >
> > protected bool SiteVisible
> >
> > {
> >
> > get
> >
> > {
> >
> > if(ViewState["SiteVisible"] == null)
> >
> > {
> >
> > return false;
> >
> > }
> >
> > return (bool)ViewState["SiteVisible"];
> >
> > }
> >
> > set
> >
> > {
> >
> > TrackViewState();
> >
> > ViewState["SiteVisible"] = value;
> >
> > }
> >
> > }
> >
> > protected bool ClassVisible
> >
> > {
> >
> > get
> >
> > {
> >
> > if(ViewState["ClassVisible"] == null)
> >
> > {
> >
> > return false;
> >
> > }
> >
> > return (bool)ViewState["ClassVisible"];
> >
> > }
> >
> > set
> >
> > {
> >
> > TrackViewState();
> >
> > ViewState["ClassVisible"] = value;
> >
> > }
> >
> > }
> >
> > #endregion
> >
> > #region Private Member Variables
> >
> > private DropDownList ddlFundingSource;
> >
> > private DropDownList ddlProviders;
> >
> > private DropDownList ddlSites;
> >
> > private DropDownList ddlClasses;
> >
> > private ParameterCollection parameters = new ParameterCollection();
> >
> > #endregion
> >
> > #region Private Constants
> >
> > private const string ReportingYearSelectorControlId =
> > "rysReportingYearSelector";
> >
> > private const string FiscalAgentSelectorControlId =
> > "fasFiscalAgentSelector";
> >
> > private const string FundingSourceControlId = "ddlFundingSource";
> >
> > private const string FundingSourceLabelControlId = "lblFundingSource";
> >
> > private const string ProvidersControlId = "ddlProviders";
> >
> > private const string ProvidersLabelControlId = "lblProviders";
> >
> > private const string SitesControlId = "ddlSites";
> >
> > private const string SitesLabelControlId = "lblSites";
> >
> > private const string ClassesControlId = "ddlClasses";
> >
> > private const string ClassesLabelControlId = "lblClasses";
> >
> > #endregion
> >
> > }
> >
> > }
> >
> >
> > "Steven Cheng[MSFT]" <stcheng@xxxxxxxxxxxxxxxxxxxx> wrote in message
> > news:2rQIZ7$lFHA.940@xxxxxxxxxxxxxxxxxxxxxxxx
> > > Hi TS,
> > >
> > > See you again :-), seems you're rushing in a asp.net project these
days?
> > > For the question you mentioned in this post, here are some of my
> > > understanding and suggestions:
> > >
> > > 1. ASP.NET controls derived from Control will automatically maintain
its
> > > ViewStates according to the asp.net web page's events sequence. So for
> > > composite control, those nested sub Controls' status (properties which
> be
> > > persistd in Viewsstate ) will be store and retrieve automatically.
> > >
> > > 2. However, there're some thing we need to care when building
composite
> > > control:
> > > #remember to implement INamingContainer for controls which will have
> > nested
> > > sub controls. Otherwise, even handler mapping, ViewState loading will
> > occur
> > > unexpectedly.
> > >
> > > #Do remember to assign a explicit ID for each sub controls(same reason
> as
> > > #1). Also, please always try best to add subcontrols in the
> > > "CreateChildControls" method(just create control hierarchy) and put
> > > manipulating code in postback event or PreRender event.
> > >
> > > In addition, for your detaile scenario, I've just built a very simple
> demo
> > > control which have three dropdownlists and The "Top" one will display
> > > first(other twos invisible) and according to the top one's selection,
> the
> > > "Mid" dropdownlist will be pouplated and the same when the "mid"'s
> > > selection changed......
> > >
> > > Here's the control's code for your reference:
> > >
> > > =========================
> > > [DefaultProperty("Text"),
> > > ToolboxData("<{0}:MultiListControl
> runat=server></{0}:MultiListControl>")]
> > > public class MultiListControl : System.Web.UI.WebControls.WebControl,
> > > INamingContainer
> > > {
> > > private string text;
> > >
> > > private DropDownList lstTop;
> > > private DropDownList lstMid;
> > > private DropDownList lstBot;
> > >
> > >
> > >
> > >
> > >
> > > protected bool MidVisible
> > > {
> > > get{
> > > if(ViewState["MID_VISIBLE"] == null)
> > > {
> > > return false;
> > > }
> > >
> > > return (bool)ViewState["MID_VISIBLE"];
> > > }
> > >
> > > set{
> > > TrackViewState();
> > > ViewState["MID_VISIBLE"] = value;
> > > }
> > > }
> > >
> > > protected bool BotVisible
> > > {
> > > get
> > > {
> > > if(ViewState["BOT_VISIBLE"] == null)
> > > {
> > > return false;
> > > }
> > >
> > > return (bool)ViewState["BOT_VISIBLE"];
> > > }
> > >
> > > set
> > > {
> > > TrackViewState();
> > > ViewState["BOT_VISIBLE"] = value;
> > > }
> > > }
> > >
> > >
> > > [Bindable(true),
> > > Category("Appearance"),
> > > DefaultValue("")]
> > > public string Text
> > > {
> > > get
> > > {
> > > return text;
> > > }
> > >
> > > set
> > > {
> > > text = value;
> > > }
> > > }
> > >
> > >
> > > protected override void CreateChildControls()
> > > {
> > > Controls.Clear();
> > >
> > > Controls.Add(
> > > new LiteralControl(
> > > @"
> > > <table width='100%'>
> > > <tr><td>
> > > "));
> > >
> > > lstTop = new DropDownList();
> > > lstTop.ID = "lstTop";
> > >
> > > lstTop.Items.Add("----------");
> > > lstTop.Items.Add("Top_Item_1");
> > > lstTop.Items.Add("Top_Item_2");
> > > lstTop.Items.Add("Top_Item_3");
> > > lstTop.Items.Add("Top_Item_4");
> > >
> > > Controls.Add(lstTop);
> > >
> > > Controls.Add(
> > > new LiteralControl(
> > > @"<br/>"
> > > ));
> > >
> > > lstMid = new DropDownList();
> > > lstMid.ID = "lstMid";
> > >
> > > Controls.Add(lstMid);
> > >
> > > Controls.Add(
> > > new LiteralControl(
> > > @"<br/>"
> > > ));
> > >
> > >
> > > lstBot = new DropDownList();
> > > lstBot.ID = "lstBot";
> > >
> > > Controls.Add(lstBot);
> > >
> > >
> > > Controls.Add(
> > > new LiteralControl(
> > > @"
> > > </td></tr>
> > > </table>
> > > "
> > > ));
> > >
> > >
> > >
> > > lstTop.SelectedIndexChanged +=new
> EventHandler(lst_SelectedIndexChanged);
> > > lstMid.SelectedIndexChanged +=new
> EventHandler(lst_SelectedIndexChanged);
> > > lstBot.SelectedIndexChanged +=new
> EventHandler(lst_SelectedIndexChanged);
> > >
> > > lstTop.AutoPostBack = lstMid.AutoPostBack = lstBot.AutoPostBack =
true;
> > >
> > >
> > > }
> > >
> > >
> > > protected override void OnPreRender(EventArgs e)
> > > {
> > > base.OnPreRender (e);
> > >
> > > lstMid.Visible = MidVisible;
> > > lstBot.Visible = BotVisible;
> > > }
> > >
> > >
> > >
> > >
> > > private void lst_SelectedIndexChanged(object sender, System.EventArgs
e)
> > > {
> > >
> > > DropDownList lst = sender as DropDownList;
> > >
> > > switch(lst.ID)
> > > {
> > > case "lstTop":
> > >
> > > if(lst.SelectedIndex != 0)
> > > {
> > > lstMid.DataSource = GetSubItems(lst.SelectedValue);
> > > lstMid.DataTextField = "Text";
> > > lstMid.DataValueField= "Value";
> > > lstMid.DataBind();
> > >
> > > MidVisible = true;
> > > }
> > > else
> > > {
> > > MidVisible = BotVisible = false;
> > > }
> > >
> > > break;
> > > case "lstMid":
> > >
> > > lstBot.DataSource = GetSubItems(lst.SelectedValue);
> > > lstBot.DataTextField = "Text";
> > > lstBot.DataValueField= "Value";
> > > lstBot.DataBind();
> > >
> > > MidVisible = BotVisible = true;
> > >
> > > break;
> > > case "lstBot":
> > >
> > >
> > >
> > > break;
> > > }
> > >
> > > Page.Response.Write("<br>" + lst.ID + "_selectedindexchanged!" +
> > > lst.EnableViewState);
> > > }
> > >
> > > #region --Helper functions---
> > >
> > > public ListItemCollection GetSubItems(string parent)
> > > {
> > > ListItemCollection items = new ListItemCollection();
> > > int count = parent.Length;
> > >
> > > for(int i=0;i<count;++i)
> > > {
> > > items.Add(parent + "_Item_" + i);
> > > }
> > >
> > > return items;
> > > }
> > >
> > >
> > > #endregion
> > > }
> > >
> > > ========================
> > > Hope helps. Thanks,
> > >
> > > Steven Cheng
> > > Microsoft Online Support
> > >
> > > Get Secure! www.microsoft.com/security
> > > (This posting is provided "AS IS", with no warranties, and confers no
> > > rights.)
> > >
> > >
> > > --------------------
> > > | From: "TS" <manofsteele1@xxxxxxxxxxxxx>
> > > | References: <uzUvXf6lFHA.1372@xxxxxxxxxxxxxxxxxxxx>
> > > | Subject: Re: explanation of when need to repopulate control
> > > | Date: Tue, 2 Aug 2005 18:32:23 -0500
> > > | Lines: 39
> > > | X-Priority: 3
> > > | X-MSMail-Priority: Normal
> > > | X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
> > > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
> > > | Message-ID: <uRDywp7lFHA.3552@xxxxxxxxxxxxxxxxxxxx>
> > > | Newsgroups:
> > >
> >
>
microsoft.public.dotnet.framework.aspnet.webcontrols,microsoft.public.dotnet
> > > framework.aspnet.buildingcontrols
> > > | NNTP-Posting-Host: 103nat100.tea.state.tx.us 198.214.103.100
> > > | Path:
TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP10.phx.gbl
> > > | Xref: TK2MSFTNGXA01.phx.gbl
> > > microsoft.public.dotnet.framework.aspnet.buildingcontrols:3979
> > > microsoft.public.dotnet.framework.aspnet.webcontrols:10243
> > > | X-Tomcat-NG:
microsoft.public.dotnet.framework.aspnet.buildingcontrols
> > > |
> > > | sorry, heres the scenario i'm trying to accomplish:
> > > | I have a composite control that contains 4 drop down lists. When the
> > page
> > > | loads initially, i want the first drop down filled and the rest
> > invisible.
> > > | When you select an item in this ddl, it posts back to the server and
> > based
> > > | on its value, it populates its immediate child's drop down list. So
> now
> > > the
> > > | top ddl has a value selected and the 2nd one just has its items
> > populated.
> > > | Then when the 2nd drop down list gets selected, it posts to the
server
> > and
> > > | its value is used to populate(filter) the items for the 3rd drop
down
> > > | list...and so on for each drop down list.
> > > |
> > > | Please tell me what i need to do to handle post back data and
maintain
> > > state
> > > | from one postback to another while keeping the drop downlists filled
> and
> > > | their values persisted.
> > > |
> > > | thank you again!
> > > |
> > > |
> > > | "TS" <manofsteele1@xxxxxxxxxxxxx> wrote in message
> > > | news:uzUvXf6lFHA.1372@xxxxxxxxxxxxxxxxxxxxxxx
> > > | > I have a quesiton:
> > > | > if i have a composite control and on its intial page loading, i
fill
> > my
> > > | (sub
> > > | > control) drop down list's items collection from the database and
> > return.
> > > | > When the user hits a button to cause postback, the control is
going
> to
> > > get
> > > | > initialized, then does its items collection that i filled on the
> > initial
> > > | > page request get repopulated from viewstate? And on top of that,
if
> > so,
> > > | does
> > > | > the list item that person selected in the drop down list again set
> > > itself
> > > | as
> > > | > the selected item in the list?
> > > | >
> > > | > OR do i have to re-load the items on every page request and then
> > > populate
> > > | > its value some other way???
> > > | >
> > > | > thanks a bunch
> > > | >
> > > | >
> > > |
> > > |
> > > |
> > >
> >
> >
>
>


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