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Convert HTML table code to asp:table control

I have an HTML table code (starts with <table> and ends with </table>), how can I make my asp web page to add this table programmatically?

If you have purely HTML code generated in server side, then you can add that HTML code having <Table> into your asp page like this.
Add a placeholder to aspx page like this.
<asp:PlaceHolder ID="plc" runat="server" />
In page_load event write this.
String str = "<table><tr><td>TD VALUE</td></tr></table>";
plc.Controls.Add(new LiteralControl(str));
This will emit html code , and place them to placeholder.
ASSUMPTION This is just a readonly html code , that you wan to show in page, you are not intended to get those value in server side code on post back. Nor there is any editable field inside the generated table.

if you want to access this table programatically then use
<table runat="server" id="YOUR_ID"></TABLE>
it will then let you access this control through asp.net

Either redo it in asp:table as you already mentioned or add runat="server" to your existing table and you will be able to alter it in codebehind.
After runat = server you can do things like
protected void Page_Load(object sender, EventArgs e)
{
var str= tbl1.Rows[0].Cells[2].InnerHtml;
}
But I would probably redo it in <asp:table> if you are using webforms. See full example here
Add rows to a table dynamically

How can I access td Id in aspx.cs page of asp.net c#?

I have used this code but it doesn't work.
HtmlGenericControl T1 = (HtmlGenericControl)Page.FindControl("T1");
T1.Visible = false;
Error Is:
Object reference not set to an instance of an object

add runat="server" and id to TD
<td runat="server" id="tdToSelect">
now you can set
tdToSelect.visible = false;
If this is inside update panel use UpdatePanel.FindControl() method

Add runat='server' to your td. Otherwise you'll need to use Javascript.

You can't.
What you can do, is use ASP.NET's TableRow and TableCell controls instead of HTML's <TR> and <TD> elements. You can then access the control you need from your ASP.NET code behind.
At render time, those controls will of course emit <TR> and <TD> elements, but you will know the ID to use in your server-side code and your code can modify the control before the server sends the generated HTML to the client.

You can only reference server side controls from your C# code. i.e. you should have an attribute set to your control runat=server and you can then assign an id to it. This way, you will be able to access it from your c# code.

You should know that FindControl function not make recursive search but you can add runat="server" to your TD and set visible.

ASP.NET set hiddenfield a value in Javascript

I don't know how to set the value of a hiddenField in Javascript. Can somebody show me how to do this?
Javascript:
document.getElementById('hdntxtbxTaksit').value = "";
HTML:
<asp:HiddenField ID="hdntxtbxTaksit" runat="server" Value="" Visible="false"> </asp:HiddenField>
error : "Unable to get value of the property \'value\': object is null or undefined"

Prior to ASP.Net 4.0
ClientID
Get the client id generated in the page that uses Master page. As Master page is UserControl type, It will have its own Id and it treats the page as Child control and generates a different id with prefix like ctrl_.
This can be resolved by using <%= ControlName.ClientID %> in a page and can be assigned to any string or a javascript variables that can be referred later.
var myHidden=document.getElementById('<%= hdntxtbxTaksit.ClientID %>');
Asp.net server control id will be vary if you use Master page.
ASP.Net 4.0 +
ClientIDMode Property
Use this property to control how you want to generate the ID for you. For your case setting ClientIDMode="static" in page level will resolve the problem. The same thing can be applied at control level as well.

asp:HiddenField as:
<asp:HiddenField runat="server" ID="hfProduct" ClientIDMode="Static" />
js code:
$("#hfProduct").val("test")
and the code behind:
hfProduct.Value.ToString();

First you need to create the Hidden Field properly
<asp:HiddenField ID="hdntxtbxTaksit" runat="server"></asp:HiddenField>
Then you need to set value to the hidden field
If you aren't using Jquery you should use it:
document.getElementById("<%= hdntxtbxTaksit.ClientID %>").value = "test";
If you are using Jquery, this is how it should be:
$("#<%= hdntxtbxTaksit.ClientID %>").val("test");

document.getElementById('<%=hdntxtbxTaksit.ClientID%>').value
The id you set in server is the server id which is different from client id.

try this code:
$('hdntxtbxTaksit').val('test');

I suspect you need to use ClientID rather than the literal ID string in your JavaScript code, since you've marked the field as runat="server".
E.g., if your JavaScript code is in an aspx file (not a separate JavaScript file):
var val = document.getElementById('<%=hdntxtbxTaksit.ClientID%>').value;
If it's in a separate JavaScript file that isn't rendered by the ASP.Net stuff, you'll have to find it another way, such as by class.

My understanding is if you set controls.Visible = false during initial page load, it doesn't get rendered in the client response. My suggestion to solve your problem is
Don't use placeholder, judging from the scenario, you don't really need a placeholder, unless you need to dynamically add controls on the server side. Use div, without runat=server. You can always controls the visiblity of that div using css.
If you need to add controls dynamically later, use placeholder, but don't set visible = false. Placeholder won't have any display anyway, Set the visibility of that placeholder using css. Here's how to do it programmactically :
placeholderId.Attributes["style"] = "display:none";
Anyway, as other have stated, your problems occurs because once you set control.visible = false, it doesn't get rendered in the client response.

I will suggest you to use ClientID of HiddenField. first Register its client Id in any Javascript Variable from codebehind, then use it in clientside script. as:
.cs file code:
ClientScript.RegisterStartupScript(this.GetType(), "clientids", "var hdntxtbxTaksit=" + hdntxtbxTaksit.ClientID, true);
and then use following code in JS:
document.getElementById(hdntxtbxTaksit).value= "";

Try setting Javascript value as in document.getElementByName('hdntxtbxTaksit').value = '0';

how to access repeater label value in javascript

This is my javascript
function btnEditClick() {
alert(document.getElementById('<%=LblRefPhyID.ClientID %>').value);
}
<asp:Repeater ID="repeaterRefPhysicianList" runat="server">
<ItemTemplate>
<tr onclick="selectRow(this);">
<td class="csstablelisttd" style="display: none;">
<asp:Label ID="LblRefPhyID" runat="server" Text='<%#Eval("Ref_Phy_ID")%>'></asp:Label>
</td>
on clientclick of Edit button i have to pass RefphyId to another page how can i do that..

It's a repeater. That means that the ItemTemplate will be repeated for each item in your databound collection.
This comes with a caveat: IDs are supposed to be unique. So when you say that your asp:Label has an ID of LblRefPhyID, ASP.NET automagically does you the favor of generating unique IDs for each instance of the repeater that eventually makes its way to your generated HTML. These generated IDs will be based on your original value of LblRefPhyID, but it won't be exactly that, so a plain document.getElementById() outside of the repeater won't work.
There are many ways to work around this, and the very first step you need to do is to actually write some code that will take the automatic generated IDs into account. Maybe write some Javascript to cache the IDs using LblRefPhyID.ClientID, maybe do it dynamically onclick, whatever.
EDIT
And, oh yeah, #Pointy is completely correct in stating that label elements don't have values, just their inner HTMLs. I don't get why he got downvoted for giving a correct response.

Try to set css class instead of id and bind elements click event by class name.
I'm using jquery for this:
$(document).ready(function(){
//bind click event on our label class
$('.lblRef').live('click', function(){
alert($(this).text());
});
});
And this in asp.net page code:
<asp:Label CssClass="lblRef" runat="server" Text='<%#Eval("Ref_Phy_ID")%>'></asp:Label>

HTML <label> elements don't have a "value". They do have contents:
alert(document.getElementById('<%=LblRefPhyID.ClientID %>').innerHTML);

Best way would be to check what is the pattern of id generated by the repeater on the client side and then you can use that id to get the value of the label using innerHTML.
For instance in your case id generated may be :
repeaterRefPhysicianList_LblRefPhyID_01 to till the number of rows in source.
So you can use this information with innerHTML to get the value of the label..
All in all just check your html page you will know what to do next :)

How to set value of <input type="hidden"> in asp .net page_load without using runat="server"

i need to do the following two things...
i want to set value of in asp .net page_load. the problem is that i dont want to use runat="server". i have tried this the following but it does not work:
HtmlInputHidden hiddenControl = (HtmlInputHidden) FindControl("a");
is there a way to access in asp .net page_load without using runat="server"? ? ?
i can do this if i use but in this case i cannot access it in master page's javascript function. i have tried this but it does not work...
var hdnField = document.getElementById('<%= hdnIdentity.ClientId%>');
var hdnField = document.getElementById("hdnIdentity").getAttribute("value");
var hdnField = document.getElementById("hdnIdentity").value
what i need... i want to access content page's hidden field value in javascript in master page. is there a way ? ? ? thnx in advance regards Haroon haroon426#yahoo.com

I sometimes do the following, especially when I want control over my ids (especially when using jquery).
<asp:literal id="literal1" runat="server"><input type="hidden" id="someid" value="{0}"/></asp:literal>
Then, in codebehind you can set the value with the following:
literal1.Text = string.Format(literal1.Text, "somevalue");
This doesn't really get around using runat="server", but you haven't specified why you don't want to do that. Also, you'd have to get the value with a request.form
Update
In .net 4.0 you have much more control over your IDs. See this for more information:
http://weblogs.asp.net/asptest/archive/2009/01/06/asp-net-4-0-clientid-overview.aspx

IIRC, you need to look in the HttpRequest.Forms, somewhere in there.

If the value is part of a POST form then you want to check Request.Forms or Request.QueryString if it's a GET form.

ad 1) in aspx file just write <input type="hidden" value="<%=GetHiddenValue%>" />. And in your code behind define protected property
public class MyPage : Page {
protected GetHiddenValue { get { /*...*/ } }

You can use it in your master page javascript how ever the control name is not what you expect it to be you'd need to use ClientID to get that. If you do not apply runat=server you can only get a hold of the control as text by either traversing the .aspx file or as some one mentioned embedding it in a named tag and then doing string manipulation on the inner HTML. That is for setting it. If you need to get the value use Request[tagName] or similar

ad 2) You can use simple html code in your content page with specified id <input type="hidden" id="myHiddenField" />. Then in master page javascript use document.getElementById('myHiddenField').