how to display date using linq search like operator in asp.net gridview

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ASP.NET

LINQ

Hi,
My form having one textbox,one ajax calendar extender, one search button and two radio buttons using linq. if i enter name or designation and so on in textbox and i click search button it will display the corresponding data in the gridview from database using linq like operator. it is working correctly(it shows hthe results in gr) my problem is when i click the calendar control and select the date that will be displayed in textbox then i click the search button it doesn't shows any results
my error is linq search doesn't supports datetime directly.

my code is here:

       protected void btnSearch_Click(object sender, EventArgs e)
        {
                if (RbnRelieve.Checked == true)
                {
                    //RbnTerminate.Checked = false;
                    string searchstr = TxtSearch.Text;
                    string likstr = searchstr + "%";
                    var search = (from a in db.M_TblAttritions where SqlMethods.Like(a.EmployeeID, likstr) || SqlMethods.Like(a.EmployeeName, likstr) || SqlMethods.Like(a.Designation, likstr) || SqlMethods.Like(a.ApprovedBy, likstr) || SqlMethods.Like(a.NoticePeriod,likstr)||SqlMethods.Like(a.RelievingDate,likstr)select a);
                   
  if (search != null)
  {
       GridView1.DataSource = search;
       GridView1.DataBind();
  }
}
}

how to display date in gridview from database using linqsearch like operator in asp.net