How to handle multiple commandfields in gridview

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C#

ASP.NET

Gridview

Hi,
How to handle multiple commandfields in gridview.

My aspx code is:

<asp:GridView ID="GridOracle" runat="server" AllowSorting="True" AutoGenerateColumns="False"
                        DataKeyNames="DIS_CHAPTER_ID" OnSelectedIndexChanged="GridOracle_SelectedIndexChanged"
                        BackColor="#CCCCCC" BorderColor="#CCCCCC" BorderStyle="Solid" BorderWidth="3px"
                        CellPadding="4" CellSpacing="2" ForeColor="Black">
                        <%-- BorderColor=#999999--%>
                        <Columns>
                            <asp:BoundField DataField="SEC_NAME" HeaderText="Section Name" ReadOnly="True" ItemStyle-HorizontalAlign="Left"
                                ItemStyle-Font-Bold="true" ItemStyle-VerticalAlign="Middle">
                                <ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" Font-Bold="True"></ItemStyle>
                            </asp:BoundField>
                            <asp:BoundField DataField="CHAPTER_NAME" HeaderText="CourseName" ReadOnly="True"
                                ItemStyle-HorizontalAlign="Left" ItemStyle-VerticalAlign="Middle">
                                <ItemStyle HorizontalAlign="Left" VerticalAlign="Middle"></ItemStyle>
                            </asp:BoundField>
                            <asp:BoundField DataField="Duration" HeaderText="Duration" ItemStyle-HorizontalAlign="Left"
                                ItemStyle-VerticalAlign="Middle">
                                <ItemStyle HorizontalAlign="Left" VerticalAlign="Middle"></ItemStyle>
                            </asp:BoundField>
                            <asp:CommandField CausesValidation="False" InsertVisible="False" ShowCancelButton="False"
                                ButtonType="Image" ShowSelectButton="True" HeaderText="Material" ItemStyle-HorizontalAlign="Center"
                                ItemStyle-VerticalAlign="Middle" SelectImageUrl="~/Content/Images/PDFLogo.png">
                                <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
                            </asp:CommandField>
                            <asp:CommandField  CausesValidation="False" InsertVisible="False" ShowCancelButton="False" 
                                ButtonType="Image" ShowSelectButton="True" HeaderText="Material1" ItemStyle-HorizontalAlign="Center"
                                ItemStyle-VerticalAlign="Middle" SelectImageUrl="~/Content/Images/PDFLogo.png">
                                <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
                            </asp:CommandField>
                          </Columns>
                        <FooterStyle BackColor="#CCCCCC" />
                        <HeaderStyle BackColor="#CCCCCC" Font-Bold="True" ForeColor="Black" />
                        <PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalAlign="Left" />
                        <RowStyle BackColor="White" />
                        <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
                        <SortedAscendingCellStyle BackColor="#F1F1F1" />
                        <SortedAscendingHeaderStyle BackColor="#808080" />
                        <SortedDescendingCellStyle BackColor="#CAC9C9" />
                        <SortedDescendingHeaderStyle BackColor="#383838" />
                    </asp:GridView>

My aspx.cs code for commandfield

protected void GridOracle_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                if (GridOracle.SelectedIndex > -1)
                {
                        this.Id = Convert.ToInt32(GridOracle.DataKeys[GridOracle.SelectedIndex].Value);
                        string _FName = "select FILE_NAME from OM_DOC_ALL where DIS_CHAPTER_ID = " + Id;
                        string _FileName = (string)SqlHelper.ExecuteScalar(strConn, CommandType.Text, _FName);
                        string FileName = "~/Downloads/OracleMaterial/" + _FileName + ".pdf";
                        Response.AddHeader("Content-Disposition", "attachment; filename=" + FileName);
                        WebClient client = new WebClient();
                        string pdfPath = Server.MapPath("../Downloads/OracleMaterial/" + _FileName + ".pdf");
                        Byte[] buffer = client.DownloadData(pdfPath);
                        BinaryWriter bw = new BinaryWriter(Response.OutputStream);
                        bw.Write(buffer);
                        bw.Close();
                        Response.ContentType = "application/pdf";
                        Response.Flush();
                        Response.Close();
                    
                }
                else
                {
                    //Clear Controls
                }
            }
            catch (Exception ex)
            {
                ErrorHandling.ErrorLog("PageLoad: ExploreJobs.aspx.cs ,  Error : " + ex.Message);
            }
        
        
    }

How to write 2 commandfields(Header text of Material & Material1) code.