Access Usercontrol's Values From Page?

Apr 9, 2010

I've created user control named test.ascs with one textbox. Now I added this user control in my default.aspx page. How can i access that textbox value from my default.aspx page?

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How to get the parent page values from the usercontrol.I have a usercontrol in a page. On click of the usercontrols button i wanna get some values from the page after executing a method. i need those values in my usercontrol. What is the best way to get the results of the page in the usercontrol.

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On masterPage i have button btnTest, how hide button from masterPage on userControl.ascx

example:  

btnSecondPage_click
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Jun 8, 2010

How do I access the Control (dropdownlist) in current Page from the UserControl? In the UserControl:

String test = ((DropDownList)this.Parent.FindControl("drpdwnlstMainRegion")).SelectedValue;
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String test = ((DropDownList)this.Page.FindControl("drpdwnlstMainRegion")).SelectedValue;

It return null on ((DropDownList)this.Parent.FindControl("drpdwnlstMainRegion")) for some reason? BTW ... I am using ASP.NET C# 3.5.

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Jun 11, 2010

I stored a object in viewstate on Page. Now when i access the same viewsate object on usercontrol,it shows as null. I even tried creating the same viewstate with same name in usercontrol and page.Both holds different value. I understand that viewstate is a protected property. How does this thing implement in above scenerio or is there any other reason for this behaviour.

Edit:

Usercontrol is there in the page markup. I am not loading it dynamically. I have a page EditFacilityworkType.aspx. On page I have a usercontrol FacilityWorkTypeDetails.aspx(FacilityWorkTypeDetails1). Inside this usercontrol i have a user control Workflow.aspx(Workflow1)

Page_Load() of Page I am retrieving workflowdetails on page_load() of page.

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Inside usercontrol FacilityWorkTypeDetails.aspx. I have a property
public FacilityWorktype FacilityWorkTypeDetails
{
get
{
#region Fill FacilityWorktype
return GetEntityFromControl();
#endregion
}
set
{
PopulateControls(value);
}
}

Now i set this property in page load of page

FacilityWorkTypeDetails1.FacilityWorkTypeDetails = facilityWorkType;
Inside Workflow.aspx, I have a property
/// <summary>
/// Property to fill entity object from controls on this page
/// </summary>
public WorkFlow WorkFlowDetails
{
get
{
return GetEntityFromControls();
}
set
{
BindTranscriptionMethodDDL(ddlTranscMethod);
PopulateControls(value);
}
}
Now PopulateControls() of FacilityWorkTypeDetails1, i am setting property of workflow1
private void PopulateControls(FacilityWorktype value)
{
Workflow1.WorkFlowDetails = value.FacilityWorkTypeWorkFlow;
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Now when i am retrieving values from

private WorkFlow GetEntityFromControls()
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WorkFlow workFlow = (ViewState["WorkFlow"] as WorkFlow) ?? new WorkFlow();
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So now inside this function workFlow is null. I want to ask,why is it null when i have set viewstate in page.

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May 4, 2010

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In the past when using this senario I've used an Interface as a way to pass a value from the UserControl (embedded in a master page) to the masterpage code behind then consume that value in the child aspx page.

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Apr 21, 2010

I have a usercontrol on the content page. I'm trying to access this usercontrol's hiddenfield.

I was able to access it before applying the master Page. But once I changed the page to a content page , the value in the hiddenfield is showing empty.

alert(document.getElementById('<%=hidLat.clientID%>').value) is showing the value.

I have a property PickupHidLat defined on the ascx page and I'm using this property to access hidLat value on the content page.

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why is the value null on the content page?

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Nov 15, 2010

I have several usercontrols which are loaded based on business logic.However, all of them have webcontrols whose selected/entered value needs to be accessible in parent page on an event.Since there can be any combination of UserControls, I do not want to load all the UserControls in the Parent Page, since they are heavy.

I would like to load only those controls which are supposed to appear on the page, yet access the value from the usercontrol which caused the postback. (I would rather not access using Request.Form) (ViewState is open, but unsuccessful to store value in parent page's viewstate in onClick)Here is a sample scenario

Page: Home

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I have a page and clicked on the button there it will open a new page containing some text boxes, user fill all the text boxes and clicked the button now first page open again and the question is : How can I get the vales of text boxes on the current page using both server-side and client-side

There is a restrictions to use of :

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Jan 20, 2011

my usercontrol standardDaten.ascx contains some textboxes.

In my contact.aspx i would like to get the values of this textboxes to send them per email to my adresse.

This is my workaround.

my Control

<sc:standard ID="scDaten" runat="server" />

my button click event in contact.aspx.vb in codebehind

[Code]....

But this button-click event returns null and i get following error message:

System.NullReferenceException - Object reference not set to an instance of an object

How can i get the values from my User-Control?

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Oct 7, 2010

I have created a user control UserVote that has property to find total vote on particular question. Now I want to call it from an aspx page.The control code-behind (UserVote.ascx.cs) looks like:

public partial class UserVote : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
DataTable dtVoteInfo = ShowVoteDetail(objectType, objectId);
if (dtVoteInfo != null)
{
if (dtVoteInfo.Rows.Count > 0)
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int.TryParse(dtVoteInfo.Rows[0]["TOTAL_VOTE"].ToString(), out currentVote);
int.TryParse(dtVoteInfo.Rows[0]["MY_VOTING"].ToString(), out myVoting);
}
}
ltrVotes.Text = currentVote.ToString();
hfCurrentVote.Value = currentVote.ToString();
hfMyVote.Value = myVoting.ToString();
// ...snipped for brevity...
}
}

The control markup (UserVote.ascx) looks like:

<div class="vote-cell" style="width: 46px; height: 92px">
<img src ="~/UserControls/Vote/Images/Arrow Up.png"
id = "voteupoff"
runat = "server" alt ="vote up"
class="voteupImage"
style="height: 45px; width: 45px"/>
<div class="vote" style ="text-align:center; color:#808185;font-weight:bold;">
<asp:Literal ID="ltrVotes" runat="server" ></asp:Literal>
</div>
<img src ="~/UserControls/Vote/Images/arrow_down.png"
id ="votedownoff"
runat = "server" alt = "vote down"
class = "votedownImage"
style="height: 45px; width: 44px; margin-left: 0px;" />
</div>
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UserVote Voteing = (UserVote) **what i write here...**.findcontrol(voting)
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My page markup (viewanswer.aspx) looks like:

<klmsuc:Voteing ID="Voteing" runat="server" />

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get;
set;
}
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I have an usercontrol with fck editor for allowing user to add note in my aspx page, which allows the user all kind of text formatting.My need is that I have to access user control from the code behind and collect the content as the same format some one has entered in the fck editor.How can I do this?

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Nov 11, 2010

(i) Default.aspx and Default.aspx.cs(ii) MyControl.ascx and yControl.ascx.csTo access MyControl.ascx from Default.aspx, we use following in Default.aspx:

Register
TagName="abc"
TagPrefix="Controls"
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But now I am wishing to access in MyControl.ascx.cs from Default.aspx.cs page. By default, I am totally unable to access any control or function exist in MyControl.ascx.cs file or say codebehind.

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I'm using DataTable for DataBinding.

Can I access dataitem (I think its suppose to be DataRow in my case) from aspx?

Something like:

<img alt="" src='<%= DataItem("ColumnName") %>' />

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UserControl, ViewState And Loosing Property Values?

Mar 29, 2011

this is about ASP.NET, ViewState, UserControls and loosing the values of my properties. It is an classic question by know, I know, and even though I have searched here and on Google for a resolution to this problem, I havent succeeded. On the contrary, the more I test different things, the less I understand it seems.

On top of this I am using ext.net and their so called DirectMethod's but I dont think that has much to do with this problem. There are numerous questions I have and I hope that this text will be fairly readable and understandable =)

The UserControl

I have a UserControl, Customers.ascx, that contains some Properties. The "most" important is *_CustomerId*. The _CustomerId is set in code-behind, in ext.net's "DirectMethod" like this (code below from the Page Customers.aspx):

[code]....

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Web Forms :: Setting The Properties Of USerControl From Values In C#?

Dec 15, 2010

I have some user controls which have properties which need to be set from a form on the page

<uc1:MyPlugin
ID="MyPlugin2"
runat="server"
Property1="Hi"
Property2="0" Property3="<%=Property3%>"
Property4="<%#Property4
%>"
/>

Property3 and Property4 anre both public properties of the page I am on and the user control

Currently the code complaing about Property3 saying it cannot create an object of Int32 from '<%=Property3%>' and Property4 always gets set to 0 (the default)

I do not wish to use the c# code to set these values as this Plugin will be deployed with a CMS which I have no control over

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Jun 12, 2010

i have added a usercontrol using designer i want to set public properties of this user control but how to access the instance of this user control?

in the designer its showing the usercontrol name as uc3:Pager#Pager1

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Wrap CustomValidator In A UserControl But Allow Access To It?

May 25, 2010

I've got a UserControl that is essentially just a TextBox with optional built-in validators to it. At the moment this is just a RequiredFieldValidator and RegexValidator. It's easy to just expose properties on the UserControl which get passed through to these validators and allow me to set the RegEx for example.

Now I'd like to add a CustomValidator and allow the user to add a server-side validation function... and this is causing me some trouble. What is the proper syntax for this? I tried just adding a ServerValidateEventHandler property, but when I try to use this I get a runtime error:

Cannot create an object of type 'System.Web.UI.WebControls.ServerValidateEventHandler' from its string representation 'valState_ServerValidate' for the 'ServerValidate' property.

Do I need to expose a delegate in some other way? This should be easy... I'm missing one little key. I'm trying to add a CustomValidator to a page which uses the UserControl... I want the user to specify a handler for custom validation on the usercontrol itself. (yes, it's a bit of a Frankencontrol)

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Web Forms :: Can't Access Property Of UserControl On MP From ASPX

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I have a UserControl that is on a masterpage... I have created the following property for the userControl in the codebehind:

[Code]....

Now I need to access this control and change that property from an aspx page that uses the masterpage with the control. I'm stuck I cannot seem to find the controls property. I can find the control and make it visible or not but I cannot find the property to modify control...

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I just started learning silverlight by creating a silverlight application in Visual Web Developer 2008. I have a public property defined in the user control. How do I access this property value in the aspx codebehind page?

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I have a javascript embedded in my extended gridview control that reference the grid control. Example:

[Code]....

HTML code:

[Code]....

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I have a scenario where I have a tabstrip on the page and each tabstrip has a usercontrol. On page load i want to display the first tab and based on certain properties on that tab i want to enable or disable other tabs. Can somebody guide me on how to do this. I am unable to access the tabstrip control on the parent page from within the usercontrol.

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