C# - Add Dynamically Controls To Asp Placeholder In Addition To Controls Which Already Exist In It

Sep 22, 2010

Add dynamically controls to asp placeholder in addition to controls which already exist in it? how to add them? for example - on page load I added to textboxs and labels to placeholder on button click I need to add additionally one more textbox.

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Maintain ViewState Of PlaceHolder / When Page Get Refresh All Controls From Placeholder Gets Removed From It?

Jan 19, 2010

how to maintain state of placeholder. i have a placeholder in which i add many image controls dynamically but when my page get refresh all controls from placeholder gets removed from it. the enableViewstate of placeholder is set to true.

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Forms Data Controls :: List View Item Placeholder / Error An Item Placeholder Must Be Specified On ListView 'ListView1'

Mar 22, 2011

I am using list view to display the the data but i am getting an error like An item placeholder must be specified on ListView 'ListView1'. Specify an item placeholder by setting a control's ID property to "itemPlaceholder". The item placeholder control must also specify runat="server.Even i have specified the itemplaceholder id but no use still same error.

[Code]....

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Forms Data Controls :: Addition Of Extra Row To A Gridview?

Jun 7, 2010

I have the following gridview with the following column showing this

Month Number of Injury Expenses

01-2003 4 $20


02-2003 5 $60

Now I want to add an extra row known as the graGrandTotal so that the result will be as shown below instead.

Month Number of Injury Expenses

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Web Forms :: Can Placeholder Control Be Added Dynamically

Jun 5, 2010

Can a placeholder control be created dynamically such that you can add controls to it later on?

PlaceHolder ph_grid = new PlaceHolder();

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Dynamically Adding A Button To A PlaceHolder In A DataGrid?

Jan 17, 2011

I have basically something like this:

<asp:datagrid id="DGrid" runat="server" AutoGenerateColumns="false">
<asp:TemplateColumn HeaderText="Stuff">
<ItemTemplate>
<asp:PlaceHolder id="PH" runat="server" />
</ItemTemplate>
</asp:TemplateColumn>
</asp:datagrid>

I need to add a Button to the PlaceHolder depending on the values of the data I am binding. At the moment I am adding the Button after the data is bound in Page_Load. The problem is that the data binding methods are not called in postbacks, so the Button disappears when I click on it.

Problem is that I need to know some attributes of the grid item to create the Button, so I cannot create it before the data has been bound.

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C# - Accessing A Control Dynamically Added To A Placeholder During An Event

Mar 30, 2011

I'm creating an ASP.NET control dynamically based on a value selected in a dropdown; for instance the field can be a textbox or a checkbox (for now), and then it gets added to a placeholder control. However, I'm unsure how to retrieve the value - using the placeholder's FindControl method returns null although I'm specifying the ID when I create the control.

Here's my code:

[code]....

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Web Forms :: Placeholder FindControl For Dynamically Created Objects?

Dec 28, 2010

txtbox.TextMode = TextBoxMode.MultiLine;

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AJAX :: ModalPopupExtender In UserControl.ascx Dynamically Loading Into Placeholder

Jul 28, 2010

if Panel have any aspnet control,panel not popups.otherwise working.whats wrong here ? is it impossible ?

[Code]....

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Web Forms :: Line Breaks In Dynamically Built Placeholder Control?

Feb 17, 2010

I have a Placeholder control on Employee Main Menu. Several SQL Data sources are run at page load in order to notify employees that something is due. Each "something is due" message is loaded into a unique label. Therefore the Placeholder could have several labels in them. For clarity's sake I'd like them separated by line breaks. However I understand from reading a previous forum item that "< /br>" are ignored. How can I embed a line break when PlaceHolder_Msg.Controls.Count > 1

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C# - Add Custom Control To A Placeholder All Controls

Jul 31, 2010

I've created a usercontrol in asp.net webforms (c#) called 'Article' which contains a general layout for an article and has a public property called datasource. the datasource will be populated by a subsonic (DAL) activerecord. In the controls pre-render event it will read the record and populates the labels. I think this is a flexible solution with easy maintenance. My problem however is that when I try to add the control to a placeholder all my controls like labels, literals and the like receive a null reference exception. I'm trying to spawn the controls as followed:

foreach (DAL.Article item in coll)
{
p7.Controls.General.Article.Article article = new p7.Controls.General.Article.Article();
article.datasource = item;
phContent.Controls.Add(article);
}

Is there something I've completely missed? It's driving me crazy heheh! Another question is do you guys know if this method will have a big impact on performance. I'm only adding 10 of those article controls per page.

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Web Forms :: Delete Controls By ID In Placeholder?

Jun 14, 2010

I have an .aspx form that has a place holder that allows a user to add controls on button click. Upon button click of "Remove last added control" the user will see the last control be removed. I have searched this and can capture the control that they are wanting to delete but am having trouble actually removing the darn thing!!

Here is my code that I have that iterates through the controls and finds the specific ID that i want to delete but does not seem to delete it due to my syntax I believe (Coded in C# in .Net envirnomnet).

foreach (Control c in myPlaceHolder.Controls)
{
if (c.ID == "myTextBox" + Convert.ToString(Session["Control_Count"]))
{
this.Controls.Remove((c));
}
}

The session["Control_Count"] is the highest or greatest value that is added to the page. (example of 2 control ID's: myTextBox1, myTextBox2.) I want to be able to Delete TextBox2 and leave TextBox1 and thought thi swas a way of doing so.

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Web Forms :: Finding Dynamic Controls I Add In A PlaceHolder

Jun 27, 2010

My code was actually working before. I think since I switched to .NET 4, it may have stopped functioning.What I do is this: I add some TextBox controls inside a PlaceHolder control. Then when user clicks the submit button, I am reading values entered into these texboxes.

This is what's on the page:

[Code]....
This is how I add controls into my PlaceHolder:

[Code]....

And this is the button click event: [Code]....

Like I said, this code was working before but now it doesn't.

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Data Controls :: Radio Button In Placeholder

Jul 24, 2012

In place holder i have radio button, and  label box --->getting values form dataset,

if i click the radio button in placeholder i want to get the value of label box

Radio button index changing--->i got the radio button value but how to get the lable value while radio button index changed

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Web Forms :: Dynamically Changing Size Of Content Placeholder Based On Browser Size?

Oct 14, 2010

I know the content palcehlder does not have a size ,I have a masterpage and content page, the master page has a table with a header, content area, and footer, header and footer are fixed size, content area is 100%. As the user sizes the browser the content area grows and shrinks and the footer stays at the
bottom of the browser window - perfect!

Problem: The contentpalceholder does not grow to fill the available content area. Now, the contentplaceholder gets its size from its contents, which in this case is a div holding a silverlight object.I was thinking I could hook the master or child page's re-size event and somehow pass that info onto the SL object, but as it turns out (and I'm surprised I never knew this) there is no aps.net page re-size event! (really?, wow.)

So is there a way to get a SL object hosted on a master page to size itself based on the size of the browser window?Or more generally, a way to size the contents (like a div or panel) of a contentplaceholder based on the browser? on a standard aspx page (not a master page) I CAN get the SL object to size itself based on the broswer, the problem seems to come from the fact that I'm hosting the SL object in a content placeholder.

I guess I could 'unroll' the master page into several standalone pages and have it work, but the menu is on the master page and I'm used to using them, plus it's already done...<sigh>

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Web Forms :: Adding "UserControl" In PlaceHolder Dynamically (at Run Time) ?

Mar 26, 2010

I have a user control which I am adding to the page dynamically. UserControl is being added "n" times in PlaceHolder.

"n" depend on the number of records pulled from the database.

[Code]....

All the UserControls are added in a single column. (Issue, if n = 50, it looks very poor since half of the page is empty)

I want to add in multiple columns (eg if n=30; 10 in each column).

I am not using GridView or MultiView because user actually does need to modify any data.

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Usercontrols - Loading User Controls Programatically Into A Placeholder?

Apr 15, 2010

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" AspCompat="True" %>
<%@ Register src="Modules/Content.ascx" tagname="Content" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
[code]...

But still no results unfortunately.

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C# - Creating Web Controls Inside A Content Placeholder Programmatically?

Mar 31, 2011

I've got a master page and a content page. How can I add controls to the master page's content placeholders programattically?

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DataSource Controls :: Iterate Through The Rows And Add The Data To A Placeholder?

Apr 21, 2010

I've got a datatable in a dataset which contains 44 rows. I can iterate through the rows and add the data to a placeholder - it's all there. However, if I bind a control (say a gridview or dropdownlist) to the datatable, all I get is one record (from the "middle" of the table). I get the same result when I create a dataview of the table - one row.

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Forms Data Controls :: HyperLink Added To Placeholder?

Sep 29, 2010

I have a Placeholder in which I added a Hyperlink (the hyperlink is an attachment in messaging application) how do I get the hyperlink to go hot when the user put there mouse over it:

[Code]....

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Cannot Find Selected Value Of Dynamically Added Controls In Repeater / How To Dynamically Add The Controls

Jan 11, 2011

I am creating a survey page that has a list of questions and answers that can be radiobuttonlists, checkboxlists or textboxes. These controls are added dynamically to a Repeater in its ItemDataBound event using Controls.Add.

I've managed to render the page ok but when I submit the form and iterate over the controls in the repeater to get the selectedvalues of the radiobuttons and textbox values, FindControl returns null. What do I need to do to get get the selected values? I've tried iterating over the RepeaterItems but that returned null too. I've tried different types of FindControl but it never resolves the control types.

It works if I add a declarative DataBinder in the Repeater like this

<asp:Repeater ID="rptSurvey" runat="server" Visible="true" EnableViewState="true" >
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem, "Question") %>
</ItemTemplate>
</asp:Repeater>

However, I want want to dynamically add the controls but in doing this i cant get the selectedvalues when submitting. This is tha main structure of my code...

[code]....

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Forms Data Controls :: PlaceHolder Contents Not Shown After PostBack

Oct 5, 2010

I have a GridView control which contains a custom <pagertemplate> with a <asp:PlaceHolder runat="server" ID="plcPages"> control. The .aspx.cs file contains the following code:
protected void Page_Load(object sender, EventArgs e) {
... {Other Code} ...
GridViewRow pagerRow = GridView1.BottomPagerRow;
PlaceHolder PagePlc = (PlaceHolder)pagerRow.Cells[0].FindControl("plcPages");
Button btnPage;
int iPageNum;
for (int i = 0; i < GridView1.PageCount; i++) { iPageNum = i + 1;
btnPage = new Button(); btnPage.ID = "btnPage" + iPageNum.ToString();
btnPage.CommandName = "Page"; btnPage.CommandArgument = iPageNum.ToString();
btnPage.Text = " " + iPageNum.ToString() + " ";
PagePlc.Controls.Add(btnPage); } }

Everything works fine the first time the page is displayed. But, when I click any pager button, including the Next and Prev command buttons that are not part of the PlaceHolder, the contents of the PlaceHolder are never re-displayed. I know from searching other posts that the PlaceHolder contents are lost during the trip to the server, but I am already recreating them every time the page is loaded. They are just never being shown again. I've spent the last two days playing with ViewState And every other combination.

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Forms Data Controls :: How To Add And Access To Placeholder In A Repeater Control

Aug 16, 2010

i want to add and access to placeholder in a repeater control. for example,

[Code]....

how can i acces to placeholder, on codebehind. i couldn't acces with it's id.

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Web Forms :: Placeholder Dynamic Controls - FindControl Doesn't Work

Jun 23, 2010

using VS 2005,Ajax and master pages This is how i'm adding controls to placeholder

[Code]....

here is code to read value but it returns null

TextBox text = PlaceHold1.FindControl("TxtSlotName0") as TextBox;

aspx page follows

<%@ Page Language="C#" MasterPageFile="~/Admin.master" AutoEventWireup="true" CodeFile="SlotAlloc.aspx.cs" Inherits="SlotAlloc" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br />
<table align="center" width="50%">
<tr>
<td align="center" colspan="2">
<asp:Label ID="LblErr" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td align="right" width="50%">
<asp:Label ID="LblType" runat="server" Text="Type"></asp:Label></td>
<td style="width: 811px">
<asp:DropDownList ID="DropType" runat="Server">
</asp:DropDownList></td>
</tr>
<tr>
<td align="right">
<asp:Label ID="LblLogin" runat="server" Text="Login"></asp:Label>
</td>
<td style="width: 811px">
<asp:DropDownList ID="DropinHours" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem>6</asp:ListItem>
<asp:ListItem>7</asp:ListItem>
<asp:ListItem>8</asp:ListItem>
<asp:ListItem>9</asp:ListItem>
<asp:ListItem>10</asp:ListItem>
<asp:ListItem>11</asp:ListItem>
<asp:ListItem>12</asp:ListItem>
<asp:ListItem>13</asp:ListItem>
<asp:ListItem>14</asp:ListItem>
<asp:ListItem>15</asp:ListItem>
<asp:ListItem>16</asp:ListItem>
<asp:ListItem>17</asp:ListItem>
<asp:ListItem>18</asp:ListItem>
<asp:ListItem>19</asp:ListItem>
<asp:ListItem>20</asp:ListItem>
<asp:ListItem>21</asp:ListItem>
<asp:ListItem>22</asp:ListItem>
<asp:ListItem>23</asp:ListItem>
<asp:ListItem>24</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropInMinutes" runat="server">
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
<asp:ListItem>03</asp:ListItem>
<asp:ListItem>04</asp:ListItem>
<asp:ListItem>05</asp:ListItem>
<asp:ListItem>06</asp:ListItem>
<asp:ListItem>07</asp:ListItem>
<asp:ListItem>08</asp:ListItem>
<asp:ListItem>09</asp:ListItem>
<asp:ListItem>10</asp:ListItem>
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>12</asp:ListItem>
<asp:ListItem>13</asp:ListItem>
<asp:ListItem>14</asp:ListItem>
<asp:ListItem>15</asp:ListItem>
<asp:ListItem>16</asp:ListItem>
<asp:ListItem>17</asp:ListItem>
<asp:ListItem>18</asp:ListItem>
<asp:ListItem>19</asp:ListItem>
<asp:ListItem>20</asp:ListItem>
<asp:ListItem>21</asp:ListItem>
<asp:ListItem>22</asp:ListItem>
<asp:ListItem>23</asp:ListItem>
<asp:ListItem>24</asp:ListItem>
<asp:ListItem>25</asp:ListItem>
<asp:ListItem>26</asp:ListItem>
<asp:ListItem>27</asp:ListItem>
<asp:ListItem>28</asp:ListItem>
<asp:ListItem>29</asp:ListItem>
<asp:ListItem>30</asp:ListItem>
<asp:ListItem>31</asp:ListItem>
<asp:ListItem>32</asp:ListItem>
<asp:ListItem>33</asp:ListItem>
<asp:ListItem>34</asp:ListItem>
<asp:ListItem>35</asp:ListItem>
<asp:ListItem>36</asp:ListItem>
<asp:ListItem>37</asp:ListItem>
<asp:ListItem>38</asp:ListItem>
<asp:ListItem>39</asp:ListItem>
<asp:ListItem>40</asp:ListItem>
<asp:ListItem>41</asp:ListItem>
<asp:ListItem>42</asp:ListItem>
<asp:ListItem>43</asp:ListItem>
<asp:ListItem>44</asp:ListItem>
<asp:ListItem>45</asp:ListItem>
<asp:ListItem>46</asp:ListItem>
<asp:ListItem>47</asp:ListItem>
<asp:ListItem>48</asp:ListItem>
<asp:ListItem>49</asp:ListItem>
<asp:ListItem>50</asp:ListItem>
<asp:ListItem>51</asp:ListItem>
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<asp:ListItem>58</asp:ListItem>
<asp:ListItem>59</asp:ListItem>
<asp:ListItem>60</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropInSeconds" runat="server">
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
<asp:ListItem>03</asp:ListItem>
<asp:ListItem>04</asp:ListItem>
<asp:ListItem>05</asp:ListItem>
<asp:ListItem>06</asp:ListItem>
<asp:ListItem>07</asp:ListItem>
<asp:ListItem>08</asp:ListItem>
<asp:ListItem>09</asp:ListItem>
<asp:ListItem>10</asp:ListItem>
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>12</asp:ListItem>
<asp:ListItem>13</asp:ListItem>
<asp:ListItem>14</asp:ListItem>
<asp:ListItem>15</asp:ListItem>
<asp:ListItem>16</asp:ListItem>
<asp:ListItem>17</asp:ListItem>
<asp:ListItem>18</asp:ListItem>
<asp:ListItem>19</asp:ListItem>
<asp:ListItem>20</asp:ListItem>
<asp:ListItem>21</asp:ListItem>
<asp:ListItem>22</asp:ListItem>
<asp:ListItem>23</asp:ListItem>
<asp:ListItem>24</asp:ListItem>
<asp:ListItem>25</asp:ListItem>
<asp:ListItem>26</asp:ListItem>
<asp:ListItem>27</asp:ListItem>
<asp:ListItem>28</asp:ListItem>
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<asp:ListItem>59</asp:ListItem>
<asp:ListItem>60</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="Lbllogout" runat="server" Text="Log Out"></asp:Label>
</td>
<td style="width: 811px">
<asp:DropDownList ID="DropOutHours" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem>6</asp:ListItem>
<asp:ListItem>7</asp:ListItem>
<asp:ListItem>8</asp:ListItem>
<asp:ListItem>9</asp:ListItem>
<asp:ListItem>10</asp:ListItem>
<asp:ListItem>11</asp:ListItem>
<asp:ListItem>12</asp:ListItem>
<asp:ListItem>13</asp:ListItem>
<asp:ListItem>14</asp:ListItem>
<asp:ListItem>15</asp:ListItem>
<asp:ListItem>16</asp:ListItem>
<asp:ListItem>17</asp:ListItem>
<asp:ListItem>18</asp:ListItem>
<asp:ListItem>19</asp:ListItem>
<asp:ListItem>20</asp:ListItem>
<asp:ListItem>21</asp:ListItem>
<asp:ListItem>22</asp:ListItem>
<asp:ListItem>23</asp:ListItem>
<asp:ListItem>24</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropOutMinutes" runat="server">
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
<asp:ListItem>03</asp:ListItem>
<asp:ListItem>04</asp:ListItem>
<asp:ListItem>05</asp:ListItem>
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<asp:ListItem>31</asp:ListItem>
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<asp:ListItem>36</asp:ListItem>
<asp:ListItem>37</asp:ListItem>
<asp:ListItem>38</asp:ListItem>
<asp:ListItem>39</asp:ListItem>
<asp:ListItem>40</asp:ListItem>
<asp:ListItem>41</asp:ListItem>
<asp:ListItem>42</asp:ListItem>
<asp:ListItem>43</asp:ListItem>
<asp:ListItem>44</asp:ListItem>
<asp:ListItem>45</asp:ListItem>
<asp:ListItem>46</asp:ListItem>
<asp:ListItem>47</asp:ListItem>
<asp:ListItem>48</asp:ListItem>
<asp:ListItem>49</asp:ListItem>
<asp:ListItem>50</asp:ListItem>
<asp:ListItem>51</asp:ListItem>
<asp:ListItem>52</asp:ListItem>
<asp:ListItem>53</asp:ListItem>
<asp:ListItem>54</asp:ListItem>
<asp:ListItem>55</asp:ListItem>
<asp:ListItem>56</asp:ListItem>
<asp:ListItem>57</asp:ListItem>
<asp:ListItem>58</asp:ListItem>
<asp:ListItem>59</asp:ListItem>
<asp:ListItem>60</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="LblNoofSlots" runat="Server" Text="Number Of Slots"></asp:Label></td>
<td style="width: 811px">
<asp:TextBox ID="TxtSlots" runat="server" AutoPostBack="True"></asp:TextBox>
</td>
</tr>
</table>
<asp:UpdatePanel id="UpdatePanel1" runat="server">
<contenttemplate>
<TABLE width="80%" align=center><TR><TD align=center colSpan=4> <asp:Button id="BtnGenerate" onclick="Button1_Click" runat="server" Text="GENERATE"></asp:Button></TD></TR><TR><TD style="TEXT-ALIGN: center" width="20%">Slot Name</TD><TD style="TEXT-ALIGN:
center" width="30%">OnTime/Time period</TD><TD style="TEXT-ALIGN: center" width="20%">Time From</TD><TD style="TEXT-ALIGN: center" width="30%">Time To</TD></TR><TR><TD colSpan=4><asp:PlaceHolder id="PlaceHold1" runat="server"><br/><br/></asp:PlaceHolder> </TD></TR></TABLE>
</contenttemplate>
</asp:UpdatePanel>
<table align="center" width="80%">
<tr>
<td align="center">
<asp:Button ID="BtnSubmit" runat="server" OnClick="BtnSubmit_Click" Text="Submit" />
</td>
</tr>
</table>
</asp:Content>

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DataSource Controls :: Hiding Placeholder Contents If SqlDataSource Is Empty?

Oct 12, 2010

I need to be able to check programatically if a SqlDataSource contains no rows, and make a Placeholder visible if it does contain rows, and invisible if it doesn't. I seem to be able to return the affected rows using SqlDataSource1_Selected, but turning the placeholder invisible never works.

turning the placeholder off and on depending on whether the data source contains rows?

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