How to clear Session("Datatable") values

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Gridview

session

How to clear session values from gridview.

I am getting problem in grid values in session thorugh datatable.

whenever i am filtering i am getting the old valus.

because, the values are maintaing in the session.

I want whenever click the searchig, it should fetch the the fresh session grid values.

How to do this...

see my code
------------

Private Property DataTable() As DataTable
      Get

          Return DirectCast(Session("DataTable"), DataTable)
      End Get
      Set(ByVal value As DataTable)

          Session("DataTable") = value
      End Set
  End Property
  Protected Overrides Sub OnLoad(ByVal e As EventArgs)
      MyBase.OnLoad(e)


      If Not Me.IsPostBack Then
          Dim dt As DataTable
          If Me.DataTable Is Nothing Then
              dt = InlineAssignHelper(Me.DataTable, Me.LoadData())
          Else
              dt = Me.DataTable
          End If
          Me.GridView3.DataSource = dt
          Me.GridView3.DataBind()
          Me.txtSearch.Attributes.Add("onkeyup", String.Format("javascript:__doPostBack('{0}','')", Me.upnlGridView.ClientID))
      Else

          Dim target As String = Me.Request.Form("__EVENTTARGET")
          If Not String.IsNullOrEmpty(target) AndAlso target.Equals(Me.upnlGridView.ClientID) Then
              If Not String.IsNullOrEmpty(Me.txtSearch.Text) Then
                  Dim dt As DataTable = Me.GetTable()
                  For i As Integer = 0 To dt.Rows.Count - 1
                      dt = DirectCast(Session("DataTable"), DataTable)
                      Dim dr As DataRow = dt.Rows(i)
                      dt.Rows.Remove(dr)
                  Next
                  GridView3.DataBind()

                  Dim rows As DataRow() = Me.DataTable.[Select](String.Format("Emp_Number LIKE '%{0}%'", Me.txtSearch.Text))
                  Me.GridView3.DataSource = Me.LoadData(rows)
                  Me.GridView3.DataBind()

              Else
                  Me.GridView3.DataSource = Me.DataTable
                  Me.GridView3.DataBind()
              End If
          End If
      End If
  End Sub
  Public Shared Function InlineAssignHelper(Of T)(ByRef target As T, ByVal value As T) As T
      target = value
      Return value
  End Function
  Protected Sub PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs)
  End Sub
  Protected Sub Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
  End Sub
  Private Function LoadData() As DataTable
      Return Me.LoadData(Nothing)
  End Function