C# - Use The Value Of A Textbox Which Is In A GridView In The Code Behind Without Using The FindControl() Method

Oct 22, 2010

How can do I that? Does anyone have a solution. It is also looking tricky but I don't have an answer.

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Forms Data Controls :: Gridview FindControl / Access Textbox In Second Gridview Footertemplate

Mar 17, 2011

I have nested 2gridview. I want to access textbox in second gridview footertemplate. How can I do this.My code is


Code Behind


Iwrite this code but I get

Object reference not set to an instance of an object.

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Forms Data Controls :: How To Correct Code In Gridview Findcontrol

Jun 15, 2010

Label1.text = CType(GridView_MyAds.FindControl("ItemId")

I need this correctly done....

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Forms Data Controls :: Create An Instance Of A TextBox In A GridView When Using FindControl?

Dec 28, 2010

In my GridView I use FindControl/<FooterTemplate> with a TextBox that you can enter an integer with a comma

into the TextBox, because I create an instance of the Textbox first and then remove the comma out of the integer before the TextBox is used to update the table in the database.

However once the data is in the table and displayed in the GridView if you try to change the integer and use a comma in the GridView you cannot because FindControl/<EditItemTemplate> will not create an instance for you to remove the comma from the integer before it updates the table because FindControl/<EditItemTemplate> doesn't allow you to create an instance of the TextBox first, instead when you try to use the instance that looks like was created it gives an error stating:

Object reference not set to an instance of an object.

So the question is:

HOw do you create an instance of a TextBox in a GridView when using FindControl/<EditItemTemplate>?

<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">


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Forms Data Controls :: FindControl In GridView / Code For Traversing Not Working

Jun 3, 2010

In my Application, I am using User control which contains one GridView and few Buttons. GridView Contains CheckBox in Item Template of first Column for Selection purpose. Now on one of the Button's click Event I am traversing through the GridView and find which row is selected.

Following is my Code for traversing which is not working:

foreach (GridViewRow row in gvCallSheet.Rows)

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C# - How To Use FindControl Method

Jul 1, 2010

How can i use findControl and how can i get id's according to FindControl method? i need to get all TextBox data there are 40 textbox. And TextBoxid data... i reall want to learn also linq method ;)

protected void Button1_Click(object sender, EventArgs e)
// SetRecursiveTextBoxAndLabels(PlaceHolder1);
CreateForm creater = new CreateForm();
creater.Holder = PlaceHolder1;


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Web Forms :: FindControl Method With MasterPage?

Dec 14, 2010

If I use the FindControl Method on an .aspx page (without master page), it finds the desired control no problem. When I use a Master Page then it will not find it even though it exists. why is this?


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FindControl Getting Wrong Control In My Recursive Method?

Mar 11, 2011

I use the following method to find a control on an asp.net page recursively:

/// <summary>
/// Searches recursively for a server control with the specified id parameter.
/// </summary>[code]...

I hit a problem because it was returning the wrong control. I tracked the problem down to the standard FindControl method, and fixed it by checking that the id of the control returned did actually match the one requested like this:

foundControl = start.FindControl(id);
if (foundControl != null && foundControl.ID == id)
return foundControl;

My question is why does start.FindControl(id) ever return a control that does not match the id requested?

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Panel.FindControl() Method Isn't Finding A Control That Has Been Added To It

Feb 9, 2011

Consider the following code, adding 2 textboxes with the same ID (oops):

protected void Page_Load(object sender, EventArgs e)
string TextBoxName = "TextBox1";
Panel p = new Panel();
TextBox t = new TextBox();
t.ID = TextBoxName;
if (p.FindControl(TextBoxName) == null) // <-------*******
TextBox t2 = new TextBox();
t2.ID = TextBoxName;

The code is designed to stop adding the same ID twice. However, the Panel.FindControl() method is not finding a control that was added in the previous line of code.

Am I using this in the wrong way?

I mean - sure - I could manually iterate through the controls in the next level, like:

string TextBoxName = "TextBox1";
Panel p = new Panel();
TextBox t = new TextBox();
t.ID = TextBoxName;
TextBox t2 = new TextBox();
t2.ID = TextBoxName;
bool duplicateFound = false;
foreach( Control c in p.Controls )
if(c.ID == TextBoxName)
duplicateFound = true;
if( duplicateFound )
t2.ID = TextBoxName + "__0";

But I don't understand why this isn't working, whereas Placeholder controls and UserControls work fine.

The reason I am using Panels is for CSS styling. body > div > input - but still - it isn't working.

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Web Forms :: FindControl Method Doesn't Work With Masterpage?

Feb 8, 2011

i have a masterpage and other pages. i want to use findcontrol method to find a textbox (not on the master page) to check whether it is empty or not.

my code is as folows;
Dim myContentPlaceHolder As ContentPlaceHolder = CType(Master.FindControl("MainContent"), ContentPlaceHolder)
Dim UpdatePanel1 As UpdatePanel = CType(myContentPlaceHolder.FindControl("UP1"), UpdatePanel)

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Web Forms :: Opening The Aspx In New Window While Retaining PreviousPage.FindControl Method?

Jul 20, 2010

I want to open a aspx page in new window.

I am openning a web page using JavaScript open .

StringBuilder cstext3 = new StringBuilder();
cstext3.Append("<script type=text/javascript> function OpenPreviewPage() {");
cstext3.Append("} </script>");

And executing following at button click on .cs page

protected void btnPreview_Click(object sender, ImageClickEventArgs e)
/*This will call the OpenPreviewPage method of java script from .cs file */
string javaScript =
"<script language=JavaScript>
" +
" +
RegisterStartupScript("ShowPreviewPage", javaScript);

The problem is the PreviousPage tag in preview page is null.

repPFareDetail = PreviousPage.FindControl("repFareDetail") as Repeater;

Is there any other way to open the aspx in new window by retaining the PreviousPage.FindControl method.

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C# - _Setting_ Textbox's Text Using FindControl?

Oct 25, 2010

I need to be able to set a textbox's (which is inside a gridview row) text to a certain string in runtime. I have used FindControl before, but can't figure out the syntax for actually setting the value of the textbox rather than just getting. Here's what I have, which doesn't compile:

((TextBox)e.Row.FindControl("txtPath")).Text = dataMap.GetString("targetPath"));

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Forms Data Controls :: GridView Textbox TextChanged Event Method?

Mar 24, 2010

I've got a GridView, with a TextBox designed in the template field. Im binding values to the textbox from ObjectDataSource.I've attached a textchanged event to the textbox, to capture the rowindex when a particular textbox value is changed by the user.


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Using FindControl To Locate TextBox In Dynamically Created Template Field?

Jun 2, 2010

My problem is as follows. I have a custom GridView control where I generate the Template fields for each column. I'm using someone elses class that extends the Itemplate and returns lables for ItemTemplate, and TextBoxes for EditTemplate.

I need this in order to implement bulk edit for the gridview where users press button Edit and all fields become textboxes, they can then change the values, and click Update button at which point I need to be able to retrieve the values from the TextBoxes in these Template Fields.

What I have tried thus far: when user clicks Edit button, my dynamic code builds the columns and specifies that the Template field is an EditTemplate, it then adds these columns to the grid view. The gridview shows the textboxes with all values retrieved from sqldatasource.

When I press the Update button, the page does a postback, as I can see Page_Load event fire, I check for a flag that I previously set when the Edit button was pressed (I store it's value in View State) and call the Update method.

In it I iterate throught the gridview rows collection, check that the RowType of each row is DataRow and call GridView.UpdateRow(i, false), passing each rows index to the UpdateRow method.At this point I have tried everything I can to find the values stored in the textboxes, but I cannot find any of the textbox controls.

I've tried using the current row's FindControl method and specifying the name of the textbox field,I've tried using Request.Params method where I can tried passing the client id, as it seen in the View Source of the page such as this


Still no luck, I've tried going up an down the Row's cells, controls collections, it seem to list the counts for rows correctly, the same goes for the amount of cells for each row, but at no point was I able to actually locate any controls such as textboxes or anything else and retrieve any values from them.

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Web Forms :: Can't Find Textbox Using FindControl In A Dynamically Built Table

Feb 27, 2010

I have an asp:table control that I construct dynamically. I place a few textboxes in it within a for loop and assign their IDs in code. I'll include an abbreviated code fragment showing how I'm doing this:


The page then displays correctly and the ID is set correctly when I view the source, but when I try to access the textbox later when the form is submitted the call to FindControl(idStr) returns null no matter what I do.

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Execute Javascript Method After Completing Code Behind Method?

May 12, 2010

I want execute below callback() method after completion of document.getElementById('btnDownload').click(); method . Now callback()executing immediatly. I want wait "Click()" process done then Execute callback(); method.

function LoadPopup() {
// find the popup behavior
this._popup = $find('mdlPopup');
// show the popup
// synchronously run the server side validation ...
function callback() {
this._popup = $find('mdlPopup');
// hide the popup

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C# - How To Call A Javascript Method From Code - Behind Web Method

Jan 25, 2011

I have a web method in my code behind:

public static string GetStateData(string state)
//this is where i want to call a javascript method "GetItems"

I have a javascript method that retrieves some values for me and I want to get use one of those values in my web method

function GetItems() {
var variable1= $("#<%=Item1.ClientID %> input:checked");
var variable2= $("#<%=Item2.ClientID %>").val();
return [variable1.text(), variable2.val(), variable2];}

I've searched for ways to call the javascript method from the web method but every time my search results in how to call a web method from javascript.

I did find this but it was done from the code-behind of a silverlight project and when I tried adding the correct reference to my code-behind it wasn't there

var result = HtmlPage.Window.Invoke("GetItems"); Is there a reference I'm missing?

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C# - Gridview FooterRow Textbox Text Is Null When Accessing From Code Behind

Oct 27, 2010

I have a GridView with the following columns

<asp:TemplateField HeaderText="Name">
<asp:TextBox ID="txt_Name" runat="server"></asp:TextBox>
<asp:Label ID="lbl_name" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "t_Name") %>' />
<asp:TextBox ID="txt_name" runat="server" Width="100px" Text='<%#DataBinder.Eval(Container.DataItem,"t_Name") %>'></asp:TextBox>
<asp:TemplateField HeaderText="Created By">
<asp:Label ID="lbl_tabcreatedby" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "t_CreatedBy") %>' />
<asp:CommandField HeaderText="Modify" ShowEditButton="True" />
<asp:CommandField HeaderText="Delete" ShowDeleteButton="True" />
<asp:TemplateField HeaderText="Add a New Name">
<asp:LinkButton ID="lnkbtn_AddName" runat="server" CommandName="Insert">Add Name</asp:LinkButton>

And then in the Code Behind I am trying to access the txt_Name Textbox as

protected void gv_Name_RowCommand(object sender, GridViewCommandEventArgs e)
string t_Name = ((TextBox)(gv_Name.FooterRow.FindControl("txt_Name"))).Text;
// Insert Code

But I am getting null in the string t_Name everytime irrespective of what is the current Text of txt_Name.
However I can get the text if I disable the ViewState for the page.

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Forms Data Controls :: How To Find GridView ItemTemplate Textbox In Code Behind

Dec 15, 2010

How to find GridView ItemTemplate (Textbox) in Code behind

if we not know textboxid

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How To FindControl () In A GridView While In Edit Mode

Jun 28, 2010

I want to access controls and update database with their value. Notice using following code:

void grdList_UpdateCommand(object source, GridCommandEventArgs e)
string str = ((RadTextBox)e.Item.FindControl("txtLookupItemValue")).Text;

I have access to control txtLookupItemValue, but it contains before-edit content, not actual value that user has entered.

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How To Call Code Behind Button Click Event Or A Code Behind Method From Javascript

May 18, 2010

how do you call code behind button click event or a code behind method
from javascript.

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May 7, 2015

[URL] .... I Need to search record from GridView by using the textbox but not want to configure this with SQLDataSource Manually (Front End) therefore how to filter gridview from Codebehind. 

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Forms Data Controls :: How To FindControl In Gridview

May 7, 2010

I have a dynamic gridview in which i need to add textbox, checkbox, imgButton in the cell dynamically.

At the moment user click on the imbgutton, a click event fire and i need to capture the user input on the checkbox and textbox of the particular cell.

I have problem in finding out the checkbox and textbox control in the imgbutton click event. The cause is i do not know which row in the gridview i need to search to for the control.

I have try gridview.Fincontrol but fail.

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Forms Data Controls :: How To Use The GridView FindControl

Jan 6, 2010

using the GridView FindControl.

What I've done is I've setup a Gridview with a datasource to show only 1 of the columns I need from the datasource, but I also have another ItemTemplate Column in which I have a dropdownlist with another datasource that I've bound to the dropdownlist.

What I need to do is have the dropdownlist show the selected one when compared to a id from datasource in the gridview.

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Forms Data Controls :: How To Using Findcontrol In Gridview

Mar 11, 2010

i have button field in grid view, basicly i want to show to in some of the row only, but i cant find the "ID" using find control

This is my aspx code


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