Web Forms :: How To Access Web Control Values
Mar 21, 2010
I am developing a site that has a page and several web controls.
Say i have webControl1.ascx, webControl2.ascx, webControl3.ascx, webControl4.ascx
I add these web cotnrols dynamically webControl1.ascx webControl2.ascx and some other times webControl3.ascx webControl4.ascx
Lets say webCotnrol1.ascx has an aspx button with ID="SaveArticle" and click event "MyClickEvent". If i press this button i am suppose to load webControl3.ascx webControl4.ascx but not webControl1.ascx webControl2.ascx.
The first problem is that "MyClickEvent" will never execute since the webControl1.ascx will never be loaded.
The second problem is that i tried to use FindControl("SaveArticle") but these does not work since the name is changed to something like "$articleControl$SaveArticle"
I think my problem is that i dont know how to hancle workflow.
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Similar Messages:
Dec 1, 2010
I am developing an application in which I have to use a User Control.I have created a user control in which I am using
- A Label (whose text will be dynamic)
- 3 Textboxes (whose values will be also dynamic).
So far everything is working fine.Now I used this user control in a aspx page and at the page_load i have to loop thru all the instance of this user control and assign values to them and here the problem begins.The values are not being assigned to the controls.
Here is the code which i have written to loop thru User Control instances and assign values to them.
[Code]...
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Jan 15, 2011
i have simple repeater control on my page:
<asp:Repeater id="Repeater1" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<asp:TextBox id="txtBox1" runat="server" Text='<%#Eval("attributename") %>'></TextBox>
<ItemTemplate>
</Repeater>
I'm bounding data to repeater control by using SqlDataSource Control
bounded data is something like this:
attributeid attributename
1 color
2 size
How can I get access to attributeid values in Repeater control's ItemDataBound event handler,
I tried to use DataBinder.GetPropertyValue(container,"attribuetid"), but I can't set container, am I doing right, or maybe I should use another approach.
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Jan 21, 2011
how to access the values of an invisible label control
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Feb 26, 2011
I am implementing a leave system using the calender control. Something like below :- Following is the markup :-
<asp:Calendar ID="Calendar1" runat="server" ondayrender="Calendar1_DayRender"
ShowGridLines="True">
</asp:Calendar>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem Value="vacation" Text="Vacation" />
<asp:ListItem Value="sick" Text="Sick" />
<asp:ListItem Value="training" Text="Training" />
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Save" onclick="Button1_Click" />
Following is the code-behind :-
protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
if (!e.Day.IsOtherMonth && !e.Day.IsWeekend)
{
CheckBoxList list = new CheckBoxList();
list.Items.Add(new ListItem("Half day"));
list.Items.Add(new ListItem("Full day"));
e.Cell.Controls.Add(list);
}
}
However, I am not able to access the the checkbox values neither in the button_click event nor in the DayRender event? Is there a better way to implement this?
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Mar 11, 2011
I have a column that I don't want to display but I still want to access its value. the other problem is that I can't access the value of a cell because it contains a label. Does someone know how to access the text in that label?
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Mar 29, 2011
How to access the HTML control values in form object, if runat="server", is not present in the HTML controls.
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Nov 12, 2010
I have a SQL database. I am getting a datatable from SQL. In SQL Query the table is having null values in the output. But when it is coming to the front end, the null values are replaced by empty values.
So in the front end in the datatable i am having empty values in some cells. I am trying to insert this datatable into access. For this i am using following code...
OleAdpData.InsertCommand.Connection = OleConn; // OleConn is the OleDbConnection
OleAdpData.InsertCommand.Connection.Open();
OleAdpData.Update(dtData); // dtData is the datatable
OleAdpData.InsertCommand.Connection.Close();
It is inserting the datatable to access database. But it is inserting the empty spaces as present in the datatable. I want to insert NULL into the cells in access datatable where the cells are empty. Where should i add my logic for this.
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Apr 2, 2010
I have a repeater that I have bound to a sql reader via my code behind page.
However I can't figure out how to populate the controls in my repeater in my code behind code.
At the moment I am having to specify the database field e.g productprice with the control in the .aspx page like this
<asp:Label ID="LabelUnitPrice" runat="server" Text='<%# Eval("productprice") %>'></asp:Label>
I would rather specify fields in my code behind than embedding them in the .aspx page.
I also have a subtotal label control in my repeater that I would like to populate its text property by mutiplying two of the database values e.g productprice * unitprice shown in my repeater.
I need to do this in code behind, looping through the repeater. Any idea of how I can do this in C#?
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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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Apr 5, 2010
I have problem while I'm inserting some values to access database ,my query contains From as fieldname
this is the query: Insert into Bank (TrancheDBID,TxnType,CACN,MatchCACN,PlanAssignDate,AssignDate,ActiveDate,From,To) values (809,'Assigned','','0156-02-01','15/05/2001 12:00:00 AM','30/11/2009 12:00:00 AM','7/10/2001 12:00:00 AM','HIL','KAH')
I have tried to put [From] but it doesnt work in vb.net, however it does directly on access
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Feb 15, 2011
im working with a 3rd party on a project, we are going to pass them up to 3 values via a querystring and they are going to return 2 values that i need within a http response.
I found a few example here and just using google but they all varied of course due to the individual requirements in those examples..
what im looking for is a example that can get me started on how to send them the values during a button click on my page, wait for a response from them, then read the 2 values returned and continue with my button event which will involve passing the values to our stored procedure.
I found this link [URL] but not sure how i would call that within my page or if this would even work for what i need.
they should have the page ready sometime today so i can see how the data is being returned and so on.. figured i would see if i can get something setup so i can just plug in values when they are ready.
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Jan 1, 2010
I am creating a web page where i need to enter maks for the student of a class. So i queried the students regno from the database and bind it to the datagrid and i've added a template column which contains the textbox to enter the marks of the student...
The problem i face here is whenever i take the value from the textbox(template column) using theFINDCONTROL it returns only the NULL string...i have given here my code
[Code]....
the value is null even if we enter some values in the textbox
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Jun 3, 2010
I have several checkbox controls on my web form that are not server controls (runat="server") How can I access these controls form my C# code? Can this be done with document.GetelementById from the server side using C#? Or some other technique?
I am not allowed to make these server controls (runat=server) because of a requirement.
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Mar 25, 2011
I access querystring values in each content page's pageload method to get Username and Id. Is there a way I access the querysting values from Masterpage's pageload method and each content page goes to Masterpage to get those values without creating any other local variables in content pages? I know this can be done with Session's or view state but I was thinking to reduce redundancy of accessing query string in each content page.
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Mar 18, 2010
I've created a gridview having an Id column whose visible property is set to false, because I don't want users to see that column. Now when user clicks on the edit button in a particular row I want to fetch the id of the cell in the Id column of that particular row. So, for that purpose I used -
void GridView_RowEditing(object sender, GridViewEditEventArgs e)
{
string Id = GridView.Rows[e.NewEditIndex].Cells[0].Text;
}
In the above code, Cells 0th index is the column index whose visible property is kept false. Now the problem I face here is that if the columns visible property is true then I can easily fetch the contents of that particular cell with the above code. But, in invisible mode I get only "" value i.e. I don't get the text or the content of that cell. Why does it happen? I don't face this problem with DataGrid Control used with 1.0 and 1.1 version. And how to resolve it or in this case is there another way of fetching the content of the invisible cell?
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Mar 8, 2011
I am trying to bind upto 3 values to a HyperLink control in a DetailView control to create a query string but it does not seem to work.
Following is my code for the HyperLink:
[Code]....
The parameters UserName, FirstName and LastName are column names from the sqldatasource.
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Jun 24, 2010
how I access /retrieve values of checkboxlist inside a repeater? My code is below..is it the same as if it was not inside a repeater? My other concern is how do I distinguish these checkboxes because basically what 's going to happen here is based on which checkbox is selected I need to query an xml file to get the location of a folder which I'm then going to zip up and allow user to download..So here's the breakdown. I have an accordion panel using jquery ui. Each panel hold a product and each product has the same checkboxes..so depending on which product the user wants to download files for which he/she will indicate by opening the accordion panel for that product and checking which checkboxes/file they want to download . So how will I know which product the user clicked the checkboxes for being that I'm using this repeater which just one ID?
[Code]....
can I still use this code or will it not work cause it's inside a repeater..also I was going to use jquery to add an onclick event to the checkbox so how can I do that now with me using this control?
[Code]....
Here's another issue..I can't even assign values to the checkboxlist using databinding..so how am I suppose to do this.. Server Error in '/ArchitectView' Application. Parser Error Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: Databinding expressions are only supported on objects that have a DataBinding event. System.Web.UI.WebControls.ListItem does not have a DataBinding event.Source Error:
[Code]....
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Mar 24, 2011
I need to create dynamic radio buttons in my page, and then access their values in postback
I create the buttons using the following code:
[Code]....
In the post back I try to access the radio buttons using their created ID:
[Code]....
But it seems that the find method is never finding the Radio button control.
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May 12, 2010
I have a datagrid "dgParents" and inside this datagrid I have another datagrid "dgChildren".
In dgChildren I have three dropdownlist drp1, drp2, drp3.
I have a button"Save"
I am able to populate data.
Now User selects any value from dropdownlist of dgChildren and click button "Save".
I have a function in code behind for button click here I want to access the values of drpdownlists that are in dgChildren so that I can save in thesevalues in db.
I'm not able to acess the vlues of dropdownlists that are in dgChildren.
I tries findcontrol and controls etc but didnt work.
I'll really appreciate any help for sample code/tutorial/.
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Nov 26, 2010
I need to access a control inside a repeater and change its properties. To enable it or not. I got an erorr message Object reference not set to an instance of an object. Here is my code inside a method. protected void
rptCAP_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
LinkButton lnDel = (LinkButton)rptCap.FindControl("lnkDelete");
lnkDel.Enabled = false; //<<<<< this is where the error occur
}
The name of the repeater control is id="rptCAP"
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Jan 12, 2010
I have a calendar control in which i am loading data from db using the below method.
[code]...
What i want to achieve is in the selection changed event of the calendar.I would like to access the calendar selected cell value.I tried to look for a event in the selection changed method but unable to come up with any.Let me know if anyone came across this and able to access the value in the selected cell control value.
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Jun 23, 2010
I have a parent control and a child control. On parent control load I am setting a cookie value. On child control I am checking if this cookie is not null then call parent control's CalculateDeliveryAndTax() method. How should I go about accessing from child control, parent control's CalculateDeliveryAndTax() method.
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Dec 11, 2010
How can I access a webform control from a Web User Control?
I have a web form with some textboxes and dropdownlists. I created a Web User Control with other controls (other textboxes) inside it. Now I need to call from the web control source code the values that the controls in my web page have. How do I do it?
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Apr 15, 2010
I want to access a label in templated user control.
I find this code in internet, but it doesn't work.
Error:Object reference not set to an instance of an object.
public static Control FindControl(Control parent, string id)
{
Control recurse;
if (parent.ID == id)
[Code]....
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