We Keep Coding

Does not contain definition of button in asp.net application

I would like to use id in code behind in aspx.cs. Not sure how to use it.
<input name="SelectAllButton" type="button" id="SelectAllButton" value="DeSelect All" class="EButton" title="DeSelect All" />
aspx.cs code
SelectAllButton.ID = "SelectAllButton";
But If use webbutton then it works but I do not want to use it.
<cc1:WebButton ID="SelectAllButton" runat="server"></cc1:WebButton>

For ASP Web Forms, you should use the ASP input types. <input /> is a client-side HTML input and won't be seen by the server.
I believe you will want to use asp:Button type.
E.g.
<asp:Button id="SelectAllButton" Text="DeSelect All" class="EButton" runat="server" />

Added tag HyperLink in aspx page without GridView in c#

On MarkUp in my aspx page form I have these two TextBox :
<asp:TextBox ID="Mtl" runat="server" ReadOnly="true" Enabled="false"></asp:TextBox>
<asp:TextBox ID="ps" runat="server"></asp:TextBox>
The HTML view for these two TextBox is :
<input name="Mtl" type="text" value="901" readonly="readonly" id="Mtl" disabled="disabled" />
<input name="ps" type="text" id="ps" />
Now I need insert next to the TextBox with id ps the HyperLink where passed in querystring the value of TextBox with id Mtl, the value is 901.
I need pass this value for working in another aspx page.
I have tried this solution but the HyperLink is not clikable :
<asp:HyperLink ID="HlLink" runat="server"
NavigateUrl='<%# String.Format("~/box.aspx?v={0}&e={1}&l={2}", "y", "IC", HttpUtility.UrlEncode(Eval("Mtl").ToString())) %>'
ImageUrl="~/Images/edit_icon.gif" Target="_blank" Text="Mtl"></asp:HyperLink>
In this aspx page I don't have GridView, maybe it does not work for this reason ?
How to do resolve this ?
Please help me, thank you so much in advance.

Yes you are correct since your control is not inside a gridview (or any databoundcontrol for that matter) that's why it will not work.
Actually, <%# %> is called data bind expressions and they are evaluated for data bound controls only. For your HyperLink control to work with this code nugget you will have to explicitly call the DataBind method on that control like this:-
protected void Page_Load(object sender, EventArgs e)
{
HlLink.DataBind();
}

You can bind a jQuery 'Change' event on your textbox. And in this event you can set correct navigation url by picking up the value from the textbox and appending it in appropriate place in your query string. Its a fairly easy solution. If you don't know how to do it I can provide you a sample.

How to Get the Value of HTML5 date element in c# Asp.net

I am using C# Asp.Net for creating a website. I have created an HTML5 date element in the web page. The date element is along with many other .Net elements (i.e textbox). I am unable to retrieve the value of date element.Below is my code
<asp:TextBox ID="TextBox10" runat="server"></asp:TextBox>
<input type="date" id="myDate" name="sel_date" value="YY-MM-DD" />
I have tried tried many methods from stackoverflow but nothing worked. i.e
1- String.Format("{0}", Request.QueryString["sel_date"]); // Not Working <br>
2- myDate.Value; <br><br>
I can get the value of textbox as its a .Net element but how can I get the value of Html5 Date element ?.

Try this code in .Aspx file
<input type="date" runat="server" id="myDate" name="sel_date" value="YY-MM-DD" />
and Access the value like this in .Aspx.cs file
String DOB = myDate.Value;

You will never get the value of HTML control directly in code behind.
Just a clarification to the above statement before it becomes "truth" :)
Yes, you can get any/all input field values, whether they are "server side control" or not (plain HTML <input />), from "code behind".
There is nothing wrong with this plain HTML5 <input /> field, it doesn't have to be a "server side" control:
<input type="date" id="myDate" name="sel_date" value="YY-MM-DD" />
It will be in the Request.Form collection on POSTback:
Request.Form["sel_date"];
Request["sel_date"];
The original code "didn't work" because it was looking for it in Request.QueryString["sel_date"]
Hth....

How to solve the following compilation error in C#?

My .aspx looks like the following:
<div id="valueIntroduction" type="text" class="labelarea" runat="server">
<input name="$labeluniversityid" type="text" id="labeluniversityid" style="color:#7D110C;border:0;background-color:#C0D5F2;width:100%" />
</div>
.cs File looks like:
if (results.Read())
{
labeluniversityid.value = results["TEXT_CONTENT"].ToString();
}
Exactly what am trying do is am getting the data from the database and displaying it in the valueIntroduction div. That is workiing fine. Now i added a text box with readonly mode. So that in my page if I press EDIT button, the value could be edited.

Use a TexBox component:
<asp:TextBox ID="labeluniversityid" runat="server" CssClass="yourcssclass"></asp:TextBox>
As for the styling:
.yourcssclass
{
color:#7D110C;
border:0;
background-color:#C0D5F2;
width:100%
}
Then, in your code behind you can easily use it like this:
labeluniversityid.Text = results["TEXT_CONTENT"].ToString();
Keep in mind that ASP.NET Controls are translated into common HTML tags, so you can wrap it and style it as you would with any other normal input of type text.
Also: type="text" is not valid for div

Try putting runat="server" attribute in <input id="labeluniversityid"> tag.
Or use a <asp:TextBox> control as areks suggests.

You need to add -
runat="server"
to your input field
Or, even better, use an
<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>