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Find input value and associated html label text in asp.net

I have the following setup:
<label for="<%= inpUserName.ClientID%>">Email</label>
<asp:TextBox id="inpUserName" runat="server" />
As you may noticed the label is not asp's label. How do I get the value of the input and the text of the label?
Edit
I am trying to loop through the posted form keys and get associated labels.

You could use <asp:Label> directly, just need to specify AssociatedControlID
<asp:Label ID="UsernameLabel"
Text="Email"
AssociatedControlID="inpUserName"
runat="server">
<asp:TextBox id="inpUserName" runat="server" />

Make the label server-side:
<label runat="server" id="lblEmail" for="<%= inpUserName.ClientID%>">Email</label>
Then you can access its text in code behind like this:
// label text
string labelText = lblEmail.InnerText;
// input value
string inputValue = inpUserName.Text;

change to:
<label runat="server" id="ClientID" for="<%= inpUserName.ClientID%>">Email</label>

You can find the textbox using the Id var txt = inpUserName.Text; for the label you can't, since its not a server side control and its not a request variable (input with value for instance) then you can't, unless you make it server side too and access in the same manner.

Asp.net render control client id in custom attribute of input field

I have following html in my aspx page
<asp:Textbox id="myTextField" runat="server" cssclass="mycssclass" data-control-id="<%= search.ClientID %>"></asp:textbox>
<asp:Button ID="search" runat="server" Text="Search" />
the problem is "<%= search.ClientID %>" render as it is in the aspx file. i need to render the client id of control.

Thy this :
And call
this.DataBind(); in page_Load
(notice change in <%#)
<asp:Textbox id="myTextField" runat="server" cssclass="mycssclass" data-control-id="<%# search.ClientID %>"></asp:textbox>
Another (more convenient solution) is to use html elements which are not server side :
<input type='text' id="myTextField" runat="server" class="mycssclass" data-control-id="<%= search.ClientID %>" />
and then get it via Request.Form[...] ( via name attribute)

If you want to know what the client ID will be, then search and read about the setting "ClientIDMode" - setting it to Static, for example, will set the client-side ID in the DOM equal to the server side ID that you set. Just make sure have only one instance of that Control on your page otherwise you have more than one control with that ID, and that won't fly. If that control will be in a repeater, item template or any other "repeating" control, then add an index counter for the loop to dynamically alter then ID slightly.

Copying HTML Input Element's Content to an ASP.NET TextBox from Code Behind

Suppose I have these both in my aspx file:
<asp:TextBox ID="tbASP" runat="server" Width="400px" />
<input id="tbHTML">
How to copy the content of tbHTML to tbASP from code behind?

1.Add runat="server" to input..
<input id="tbHTML" runat="server">
you will access in code behind..
2.Else use find control
System.Web.UI.HtmlControls.HtmlInputControl tbHtml= this.FindControl("tbHtml") as System.Web.UI.HtmlControls.HtmlInputControl;
tbAsp.Text=tbHtml.value;

Make sure the Id of ur Input element is unique in page...than you can try like this.
tbASP.Text=Page.Request["tbHTML"].ToString();
Edit Vice Versa
<input id="id" value=<%= TextBox1.Text %> />

How to set passwordchar property to asp.net TextBox?

I have one TextBox for Password and i want to set character for password, so which property can be used in asp.net?
<asp:TextBox TextMode="Password" runat="server" />

PasswordChar property is under this namespace, System.Windows.Forms. It is not available for asp .net web applications.
You could try JavaScript to change it into other characters such as "*" or "#".
You can see the following example to do so:
<script type="text/javascript">
function onTextChange(obj)
{
document.getElementById('hdnActualTextValue').value = obj.value;
obj.value = '';
for(int i=0; i<obj.value.length;i++)
{
obj.value +='*';//OR ANY OTHER CHARACTER OF YOUR CHOICE
}
}
</script>
<asp:TextBox ID="txtValue" runat="server" onblur="javascript:onTextChange(this);"
onkeyup="javascript:onTextChange(this);" onkeypress="javascript:onTextChange(this);"></asp:TextBox>
<asp:HiddenField ID="hdnActualTextValue" runat="server" />
OR maybe you could use input in HTML.
<label>PW: <input type="password"></label>

I think if you are using the Web Forms then in that the Password Characters are fixed. You can not change unless you use Javascript to change some behavior at run time
When we use WebForms in that PasswordCharacters are set by default.
Check out this link. You can get some Idea what I am telling you.

Simply use TextMode property in asp
<asp:TextBox ID="txtValue" runat="server" TextMode ="Password"> </asp:TextBox>

Getting data from an Input control in to code behind

I am using asp.net C#
I am also using the jQuery UI Calendar control.
calendar control
It appears the calendar control wants to work with an input control with an ID of "datepicker".
<input type="text" id="datepicker" />
I want to use value of the input control in my code behind but seeing how it is not an asp.net control I am not sure how I can reference it in the code behind.
Does anyone know how to get the value of the input control in the code behind?

use
<input type="text" id="datepicker" name="datepicker" />
and in the code behind:
Request.Form["datepicker"]
In fact, Form property of Request is populated with form values.

Here you have to mention your form name which contains input tag
<input name="txtemail" id="txtemail" runat="server" type="text" class="cssspa" form="form"/>
in C#
string email = txtemail.Value.ToString();
now u can get data from textbox

If you want to use basic form pulling, you need to add a name attribute:
<input type="text" id="datepicker" name="datepicker" />
if(Page.IsPostBack)
{
string value = Request.Form["datepicker"];
}
Alternatively, you can mark is as an HtmlInputControl
<input type="text" id="datepicker" runat="server" />
System.Web.UI.HtmlControls.HtmlInputControl datepickerControl = this.FindControl("datepicker") as System.Web.UI.HtmlControls.HtmlInputControl;
if(datepickerControl != null)
string value = datepickerControl.Value;

You can access the value via the Request object like onof wrote, or you can turn every html tag into a server control by adding the attribute runat:
<input type="text" id="datepicker" runat="server" ClientIdMode="static" />
The attribute ClientIdMode="static" ensures that the tags ID is not changed by the ASP.NET runtime.
Then you can access the input by the autogenerated member datePicker.

Since you explicitly say code-behind, I assume you probably want to stay with the WebForms/Controls model? With clientidmode you can do that while also having a determinite id value for the calendar.
<asp:TextBox id="datepicker" ClientIDMode="Static" runat="server" />
Then you can interact directly with the control from the code-behind as normal.
But, the calendar control does not require a specific ID. You can initialize it with whatever ID you want
<asp:TextBox id="DateTextBox" runat="server" />
<script>
$(function() {
$( "#<%=DateTextBox.ClientID%>" ).datepicker();
});
</script>