Filter GridView based on multiple CheckBoxList using C# and VB.Net in ASP.Net

Hi  I have an issue  I have 2 Checkbox list populated the data from database. It is fine One is Industry, Another one is Department If i select multiple selection from checkbox list,  i need load data into grid view control based on selection.

<div class="col-lg-3">
    <asp:Label ID="Label1" runat="server" Text="Industry" ForeColor="Red" Font-Bold="true"></asp:Label>
    <div style="width:230px;height:300px; padding:1px; overflow:auto; border: 1px solid #ccc;">
        <asp:CheckBoxList ID="chkIndustry" runat="server" CssClass="form-control-lst" RepeatLayout="table"
                RepeatColumns="1" RepeatDirection="vertical"></asp:CheckBoxList>
    </div>
</div>

<div class="col-lg-3">
    <asp:Label ID="Label2" runat="server" Text="Department" ForeColor="Red" Font-Bold="true"></asp:Label>
    <div style="width:230px;height:300px; padding:1px; overflow:auto; border: 1px solid #ccc;">
        <asp:CheckBoxList ID="chkDepartment" runat="server" CssClass="form-control-lst" RepeatLayout="table"
                RepeatColumns="1" RepeatDirection="vertical"></asp:CheckBoxList>
    </div>
</div>

   <asp:GridView ID="GridView1" runat="server" CssClass="gridview" AutoGenerateColumns="False" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None"
        BorderWidth="1px" CellPadding="3" PageSize="15">
        <Columns>
            <asp:CommandField ShowSelectButton="True">
                <ItemStyle Width="50px" />
            </asp:CommandField>

            <asp:TemplateField ShowHeader="False">

                <HeaderTemplate>
                    <asp:CheckBox ID="allchk"  runat="server" />
                </HeaderTemplate>

                <ItemTemplate><asp:CheckBox ID="chk" runat="server" /></ItemTemplate>
                <ItemStyle Width="10px" />
            </asp:TemplateField>
            <asp:BoundField DataField="Code" HeaderText="Code" />
            <asp:BoundField DataField="name" HeaderText="CoName"  />
            <asp:BoundField DataField="industry" HeaderText="Industry"  />
            <asp:BoundField DataField="NAMED" HeaderText="Delegate"  />
            <asp:BoundField DataField="status" HeaderText="Status"  />


        </Columns>
        <FooterStyle BackColor="White" ForeColor="#000066" />
        <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
        <RowStyle ForeColor="#000066" />
        <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#F1F1F1" />
        <SortedAscendingHeaderStyle BackColor="#007DBB" />
        <SortedDescendingCellStyle BackColor="#CAC9C9" />
        <SortedDescendingHeaderStyle BackColor="#00547E" />
    </asp:GridView>

Function

Public Function LoadParamDetails_CHK(chkList As CheckBoxList, strParamHead As String) As String
      LoadParamDetails_CHK = String.Empty
      Dim sConstr As String = ConfigurationManager.ConnectionStrings("ConnectString").ConnectionString
      Dim Conn As New SqlConnection(sConstr)
      Using Conn
          Dim command As New SqlCommand("Select * from Parameter where paramhead ='" & strParamHead & "' order by paramdetails", Conn)
          Dim da As New SqlDataAdapter()
          Dim dt As New DataTable()
          command.CommandType = CommandType.Text
          Conn.Open()
          da.SelectCommand = command
          da.Fill(dt)
          chkList.DataSource = dt
          chkList.DataValueField = "id"
          chkList.DataTextField = "paramdetails"
          chkList.DataBind()
      End Using
      Conn = Nothing
      Return LoadParamDetails_CHK
  End Function

Call Function

LoadParamDetails_CHK(Me.chkIndustry, "industry")
LoadParamDetails_CHK(Me.chkDepartment, "department")

I used try this code. It is populated only one industry even though i have selected Multiple industry and also I am blur how to add selected department into this code from Department checkbox list

Private Sub LoadSelectDelegate()
    For i As Integer = 0 To Me.chkIndustry.Items.Count - 1
        If Me.chkIndustry.Items(i).Selected = True Then
            Dim query As String = "select * from vw_Client_HD where industry = '" + Me.chkIndustry.Items(i).Text + "'"

            Dim dt As DataTable = GetData(query)
            Me.GridView1.DataSource = dt
            Me.GridView1.DataBind()
        End If

    Next

Pls advice me

Thank you

Maideen