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Show element by checking session in asp.net

I want to show element (div element) by checking
Session of user It means if User didn't login when Click on the TextArea show Login page with
Here is my code...
<script>

$(document).ready(function () {

$('.form-control').click(function () {
$('.form').show();
return false;
});
});
</script>


///code of textarea

<div class="form-group">

<textarea class="form-control" name="Text" id="Text" rows="5" data-rule="required" placeholder="message" onclick="loginfunction"></textarea>
<input type="hidden" name="Date" id="Date" class="form-control" value="@DateTime.Now" />
<div class="validation"></div>
</div>


////code of login page

<div class="form" id="login-modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true" style="display: none;">
<div class="modal-dialog">
<div class="loginmodal-container">
<h1>Login to Your Account</h1><br>
<form>
<input type="text" name="user" placeholder="Username">
<input type="password" name="pass" placeholder="Password">
<input type="submit" name="login" class="login loginmodal-submit" value="Login">
</form>

<div class="login-help">
<a href="#">Register</a> <a href="#">Forgot Password</a>
</div>
</div>
</div>
</div>


And i put the session in hidden textbox

<input type="hidden" id="cuser2" value="@Session["LoginUSERS1"]" />


I tried to solve this problem with some codes
But Ican't understand this problem

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