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ExportToPdf returns 0KB

I have used the Telerik RadEditor and the ExportToPdf method in C# but
when the PDF is downloaded it contains 0KB, but it contains data in the RadEditor content.
This is my code:
<telerik:RadEditor runat="server" ID="RadEditor1" SkinID="DefaultSetOfTools"
Height="515px" Visible="false" ContentFilters="DefaultFilters,PdfExportFilter">
<ExportSettings OpenInNewWindow="true" FileName="ErinLetter">
</ExportSettings>
<ImageManager ViewPaths="~/PDFbarcode" UploadPaths="~/PDFbarcode" DeletePaths="~/PDFbarcode"></ImageManager>
</telerik:RadEditor>
<br />
<div align="right">
<asp:Button ID="btnPdf" runat="server" CssClass="NFButton" Text="PDF" OnClick="btnPdf_Click" />
</div>
The content binds from the backend, for example:
<h2>Test RadEditor</h2>
but it returns 0KB.

Try setting the RadEditor's Visible property to true. I don't think export will work if it is false.
Also, compare your setup with the original here http://demos.telerik.com/aspnet-ajax/editor/examples/pdfexport/defaultcs.aspx and see what's the difference that breaks stuff.

Try to set the content inline in the declaration:
<telerik:RadEditor runat="server" ID="RadEditor1" SkinID="DefaultSetOfTools"
Height="515px" Visible="false" ContentFilters="DefaultFilters,PdfExportFilter">
<Content>
<h2>Test RadEditor</h2>
</Content>
<ExportSettings OpenInNewWindow="true" FileName="ErinLetter">
</ExportSettings>
<ImageManager ViewPaths="~/PDFbarcode" UploadPaths="~/PDFbarcode" DeletePaths="~/PDFbarcode"></ImageManager>
</telerik:RadEditor>
You can also hide the editor by wrapping it in a hidden

C#, ASP.NET / Tutorial /Different Button

I was following this tutorial:
http://www.hongkiat.com/blog/css3-on-off-button/
I would like everything the same except I would like to change:
<section>
<a rel="external" href="#button" id="button"></a>
<span></span>
</section>
to:
<section>
<asp:Button CssClass="button" id="Button3" runat="server" OnClick="Button3_Click" Text=""\uf011;"" />
<span></span>
</section>
Because of simpler adding buttons and then programming them. Everything works OK, just when I click the button it doesn't become white and the red dot doesn't become green, I guess it's because in the tutorial is button used like a link, and if I add it with visual studio it's not a link, what could I do that i woul style the button like that even if I add it with visual studio.

If you want to have a hyperlink you should use LinkButton element. Button component shows a button element. LinkButton is rendered as a hyperlink with some extra properties.
<asp:LinkButton CssClass="button" id="Button3" runat="server" OnClick="Button3_Click" Text=""\uf011;"" />
Also you can try the following code in order to have code-behind capabilities for a stanrdard a tag.
<section>
<a rel="external" href="#button" id="button" runat="server"></a>
<span></span>
</section>
Another option is using HyperLink component
<section>
<asp:HyperLink Text="" rel="external" href="#button" id="button" runat="server"></asp:HyperLink>
<span></span>
</section>
You should pay attention to anchor's id attribute. I mean, The id attributes are prepended with MainContent_ if you have not set it to be shown only with the value you gave.
There are two options for this:
Change jQuery's selector from $('#button') to $('#MainContent_button')
Change .NET settings for showing your elements without prepending MainContent_ prefix.

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 ..>

textarea's maxlength property without using javascript

i want to use MaxLength behaviour with multiline textbox, which become textarea on rendering.
i need to use Maxlength behaviour without using jquery or javascript.

Just set the maxlength attribute on the textarea, like so:
<textarea maxlength="5"></textarea>
Fiddle: http://jsfiddle.net/spaFS/
This will only work in HTML5 documents (and browsers that support it). In HTML4 and older browsers you can't achieve this without JavaScript.
Or for an ASP.NET TextBox, just do:
<asp:TextBox MaxLength="5" />

<asp:TextBox id="tb6" rows="5" MaxLength="20" TextMode="multiline"
runat="server" />

"Converting" asp.net form to html form

i have an asp.net webform. the users enter data into the textboxes and i do OnClick="SubmitData" with a button:
now i would like to use jquery and make my form look much better and i do not know if i can keep the asp.net controls or whether i have to convert to html controls.
question do i need to convert
<asp:TextBox ID="section_c_issue_error_identified_byTextBox" width="500" runat="server"
/>
to something like this:
<textarea name="comments" id="comments" rows="5" cols="60"></textarea>
and if so, how would i grab the user input from these new html textboxes?
can you tell me exactly how would i pass these values into my c# code?

You don't need to convert anything as it gets converted to html anyway on clientside.
There are few ways to grab the value of the text box such as,
If the following is my textbox,
<asp:TextBox ID="txtCountry" Width="500" runat="server" CssClass="countryText" />
I can use,
$('#<%= txtCountry.ClientID%>').val()
$('.countryText').val()

You don't need to convert anything, simply adding the property clientID the type static
ClientIDMode="Static"
That's warranted that the id asp component doesn't change the name of the id
<asp:TextBox ID="txtCountry" Width="500" runat="server" CssClass="countryText" ClientIDMode="Static" />
$('#txtCountry').val();

question do i need to convert
<asp:TextBox ID="section_c_issue_error_identified_byTextBox"
width="500" runat="server"
/>
to something like this:
<textarea name="comments" id="comments" rows="5"
cols="60">
Yes, you need to do that.
To capture input from those controls using JQuery, you need to do:
var elementValue = $('#elementid').val();
elementid is the id you assigned to the element in your markup. In your example above, it would be "comments".
elementValue will have the text entered in your text area.