Asp.net master.cs file not identifying the controls present in master.aspx page

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I have created a label control in my master.aspx page....in my code behind file(master.cs) when Iam trying to use it..it's throwing error like--- "the control does not exist in the current context"..not only label any control when I try to use in .cs file it's showing 'control does not exist" ...struggling any help?
my code as follows..

codebehind file<br />
----------------<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Linq;<br />
using System.Web;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
public partial class SprintSafety : System.Web.UI.MasterPage<br />
{<br />
    SprintSafetyDataContext objc = new SprintSafetyDataContext();<br />
    protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
<br />
        if (Session[&amp;quot;JID&amp;quot;] != null)<br />
        {<br />
            string s = Session[&amp;quot;JID&amp;quot;].ToString();<br />
            var a = (from selecteddata in objc.tblJobs where selecteddata.ID == Convert.ToInt32(s) select selecteddata.JobName).FirstOrDefault();<br />
       error  ------&gt;  lblJobid.Text = a.ToString();<br />
<br />
        }<br />
    }<br />
}<br />
<pre>&amp;lt;pre lang=&amp;quot;msil&amp;quot;&amp;gt;showing error<br />
---------------<br />
Error   6   The name &amp;amp;#39;lblJobid&amp;amp;#39; does not exist in the current context   D:\pradeep2\SprintSafety\SprintSafety.master.cs 22&amp;lt;/pre&amp;gt;<br />
 my label control in master.aspx page<br />
----------------------------------------<br />
 my label control in master.aspx page<br />
----------------------------------------<br />
<br />
 <br />
            <div class="butt_main_inner"><br />
                <asp:Label ID="lblJobid" Text="" runat="server" /></div><br />
                       ---<br />
-----<br />
----------</pre>