C# - User Control Not Retaining Property Values?

Oct 28, 2010

I have a very simple user control with 5 radio buttons on it, and 3 properties (ID, RatingSetID, and Rating). On the initial load of the page they are on, the code acquires data and places the data into the 3 properties. However, when the submit button is clicked the page reloads and the 3 properties get reset to 0, they are in the !IsPostBack as well.

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C# - Setting Property Default Values For A Web User Control?

Apr 15, 2010

I am trying to build a web user control and set some default values for its properties in the code-behind like this:

[DefaultValue(typeof(int), "50")]
public int Height { get; set; }
[DefaultValue(typeof(string), "string.Empty")]
public string FamilyName { get; set; }
[DefaultValue(typeof(Color), "Orange")]
public System.Drawing.Color ForeColor { get; set; }

When I add the user control to the page and call it without any properties:

<uc1:Usercontrol ID="uc" runat="server" />

the default values are not set and every property is 0 or null.

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Web Forms :: Restoring User Control Property Values Upon Postback?

Jun 9, 2010

I'm constructing a User Control that will have one Property called "ContractIdx". Here's how I've constructed this Property:

public int ContractIdx
{
get
{
return Convert.ToInt32(this.Attributes["ContractIdx"]);
}
set
{
this.Attributes["ContractIdx"] = value.ToString();
}
}

I'm initially loading the User Control by passing a parameter to it and setting ContractIdx accordingly. That all works fine.

Upon Postback though I'm loading the User Control without any parameters and then setting its ID property to what it was before the Postback. My understanding was that if I did this then ViewState would properly restore everything. Yet apparently this is not the case with the "ContractIdx" attribute.

Where am I mistaken in my understanding? How should I change things to get this mechanism to work?

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AJAX :: Passing Property Values From Server To Client In A User Control ?

Aug 13, 2010

I have a user control which has some properties configured on it. I need to access (actually, only read) the values of those properties on the client. I have done it like this.

Code behind:

[Code]....

ASPX:

[Code]....

That works but, at the back of my mind, I'm sure I've seen a neater way of doing it, although I suspect that may have been on an Extender not a User Control. Pointers on that welcome.

Also, related to that, the User Control itself has an Id which becomes part of the name of all visual objects included within it. However, the User Control is not a DOM element in its own right (because it has no visible rendering) which [I think] means that I have to attach properties to one of the visible elements within it, and not to the control itself?

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Custom Server Control Not Retaining Values After Post Back?

Apr 4, 2011

I have a custom server control (composite control having dynamically created dropdown boxes and textboxes). I have enabled AJAX in order to avoid page reload.The server control is used inside the ASP.NET webcontrol having few buttons which controls the visibility of the server control. Now I enter values in the dropdown box and texboxes and click on any other button. After this postback the last entered values are gone! The control is not remembering the values. How can I retain the values after post back?

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Jun 12, 2010

I Have the gridview control with 2 dropdown list and 2 text boxes,When the textbox chnaged event happen 1 row will create and the dropdown back to initial values( its not retaining the selected values),I am binding the control after text changed method,Is there any properties needs to be set or any other way we can retain the values in postbacks?

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Web Forms :: Accessing A Public Property Of A Nested User Control In A Master Page From A Pages' User Control?

Sep 10, 2010

I've got a web site that has a master page and that master page (mpMaster that has a user control ucControl1) which has a sub user control (ucControl2), this user control has a property which accepts a value. Now, I have a page that uses the master page
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Jan 7, 2011

I'm trying to retain "visible" property of a control using view state in the following way

public bool showstatusbox {
get { return Convert.ToBoolean(ViewState["statusbox"]); }
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}

Is there anything I should do other than this to retain value. Because, though I store the value in view state, on postback, its becoming null.

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Web Forms :: Set Button Property In A User Control From Another User Control

Mar 22, 2011

i have 2 user control : uc1 and uc2. and i have button in uc2 i call button1, i want to set commandArgument of button1 from uc1, how can i do this?

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Listbox Not Retaining Selected Values Between Postbacks

Jul 16, 2010

I have a Listbox getting populated when the page loads itself and also in postbacks. Some items are already selected in that listbox even when the page loads or postbacks. I have to select one or more items in that textbox in addition to the selected one.

Till this point, it works perfectly, but the problem is that when i click an "update" button to save the newly added items, then also the page postbacks and so the list box get populated again. This will loose the newly selected items and none of the newly selected items will be saved.

So what should i do in order not to loose the newly selected items when i click the "update" button.

Note:- I need to populate the listbox on postbacks also. So the population of that listbox on postbacks cannot be discarded.

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VS 2008 HTML Input Controls Not Retaining Values?

Feb 16, 2010

I've got several HTML Input controls (type = "text", runat="server") on a ASPX page. As part of this page, I'm doing a callback (no postback wanted) and am attempting to get the values of the HTML Input controls.

However, when I set a breakpoint in the callback method on the server side, the HTML Input control values aren't there.

So, I have two questions...

1)... According to Microsoft and several other experts, when a Callback is initiated (Javascript calling a server side method), that there would not be a Postback. But, when I debug, I see the Page Load and several other methods being called. I can see the HTML controls in the Page Load event, but again, there isn't any values

2)... How can I retain the values of the HTML Input controls so that I can retrieve their values server side? Again, I'm using Runat = "Server" so that I can "supposedly" find them server side.

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Web Forms :: How To Set Property To Control The Values In Textbox

Jun 16, 2010

how can I use get set property to control the values in textbox

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State Management :: Retaining The Dropdown List Values Moving From One Page To Another

Mar 27, 2010

I have four dropdowns in the first page and then a button which saves the selected values from the dropdown to a session state .

In the second page I do have previous button which comes to the first page. My problem is that the dropdown values are not getting preserved.

Here is my code for the First page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MyBusinessLayer;
using MyDataLAyer;

[Code]......

The problem is that I get the error object instance not set to an instance of an object

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Web Forms :: Passing Values From Parent Page To User Control And Maintaining The Values Added

Mar 18, 2011

I wanted to know if we can pass values from Parent page (in this case from Default.aspx page) to the user control and maintain those values on subsequent "Add/Load" of user control.

So in short, if I click the "Add" button it loads my "webusercontrol" and also I am able to pass my default.aspx dropdownlist value to this dynamically loaded user control and assign it to a "Label or Textbox" which resides in my "webusercontrol", now the problem is that the value doesn't persists! What I meant is , when I click "Add" button again the "webusercontrol" gets loaded again perfectly but now all my "Label's" in webusercontrol has the new selected value from the default.aspx dropdownlist.

So say for instance I have a Dropdownlist in Default.aspx page with Values "Apple, BlackBerry, Nokia" and initial value to be passed is "Apple", I click the "Add" button, now my "Label" inside webusercontrol has the value "Apple", perfect! Next when I click "Add" button again and select a different value to be passed this time say "BlackBerry" now I have 2 webusercontrol loaded on the page, so that means I have 2 "Labels" with different ID's, but now my first Label initially had the value "Apple" because that's what I had passed and now when I passed the value "Blackberry" both the labels of my webusercontrol has the value "BlackBerry" instead of one being "Apple" and another "BlackBerry"

Is there a way to resolve this issue? may be Dictionary List?

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Nov 12, 2010

I need a way to create unique values for a property in my custom server control..

In this case I will have the poroperty called "Name" and I neeed the value of Name to be unique for each "instance" of the control...

So for instance if I have a page with more then one instance of the control, I dont want the value of the Name property for these instances to be allowed to be the same..

...to put it kind of simple, if I dont remember this incorrect, I want it to be sort of like the ID property..but with another name then ID.

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May 28, 2010

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Web Forms :: How To Get Property Value From The User Control

Oct 28, 2010

I have a user control that has the following property

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I created one web user control with property named "ReadonlyField" with boolean datatype. I am able to use in my web pages and now i wanted to add a description to that property so that i dont need to explain each time to my team member what is that property's intention.

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[Description("My Description")]
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get {..}
set {..}
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How To Map A User Control Property To A Server Control Within It

Jun 2, 2010

I have a user control with a WebDateTimeEdit server control on it (essentially a TextBox). I'd like to be able to set some of the server control's properties by way of the user control's markup or programatically. for example I have this defined on my user control:

[code]....

this blows up because WebDateTimeEdit1 is null.

is there any way I can make this happen? also can do I do this

myControl2 .Font.Size = FontUnit.Point(8);

where the Font property is read only on the server control?

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Web Forms :: Site Navigation And Retaining User Selections?

Feb 17, 2010

handle site navigation and retaining user selections.

On Page 1:

I am using an <asp:ListBox as a filter for an <asp:GridView (gv.datasource=myobj.getdata(lb.selectedvalue))

This functions as expected and the gridview pagination functions as expected.

Each row on the grid provides an <asp:HyperLinkField to navigate to another page (Page 2).

This functions as expected.

On Page 2:

This provides functionality to perform some data creation/manipulation tasks.

It also provides a link to navigate to another page where other tasks can be performed (Page 3).

My query is in relation to returning from Page 3 to Page 2 to Page 1.

I would like to be able to return from Page 3 to Page2 to Page 1 and display earlier selections.

Currently, I am using a combination of querystring parameters and sessions vars on each Page_Load to achieve this.

Q1: What are the recommended ways to achieve this?

Q2: Is it possible to dynamically specify url parameters on a sitemap?

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Can Insert User Control With Inner-tag Content As Property Value

Apr 16, 2010

I have a control that I want to be able to mark areas as editable. When a user enters a username and password, they can then edit these editable areas.One of the area to edit is the main content of the page. Since I want them to be able to edit this on every page, I have put the editable control into the master page, wrapped around the ContentPlaceHolder of the master page.I found out how to allow the parser to allow <prefix:tag></prefix:tag> rather than just ending it with />, but I can't figure out how to get the text within the tags to be accessible through something like a Text property. A prime example of this behavior is the Label control, where you can put <asp:Label>Hello!</asp:Label> and access Hello! through the .Text property in the code.

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Apr 2, 2010

how to access a property on my parent page from a user control?

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Jan 25, 2010

I have created a user custom control, and what I would like to do is to pass it the text value from a label where I can carry out some other processing.

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Databind A Property On A Custom User Control?

Nov 29, 2010

I have a custom user control UserProfileLink on which I have two basic string properties, UID and UserFullName which I would like to use in a template column in a DataGrid like this:

....
<ItemTemplate>
<td:UserProfileLink ID="uplUser" runat="server" UID="<%#Eval("UserUID") %>" UserFullName="<%#Eval("UserFullName") %>" />
</ItemTemplate>
....

I get an error saying "The server tag is not well formed" which leads me to believe this type of binding isn't possible. Is there a way to do this, or is it impossible?

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Set Web User Control Property To GridView Selected Row?

Feb 2, 2010

I have a web user control (ascx) that exposes an "ID" property. What I want to do is set this property when the SelectedIndexChanged event fires in a gridview in the containing page. However, I can't seem to do it.... Here's my code:

protected void grdPhysicians_SelectedIndexChanged(object sender, EventArgs e)
{
physicians_certif1.mdID = grdPhysicians.SelectedDataKey.ToString();
mvData.SetActiveView(viewEdit);
panAdditional.Visible = true;
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Physicians_certif1 is the user control. It seems the user control is loading before the SelectedIndexChanged event has a chance to set it's property.

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