how to Fill grid view from both XML data and sql table data

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C#

ASP.NET

I have a grid view that contain many fields, here I am retrieving data from XML file and want to take one more column from the table also. how can i take that from the table.

This is the below code I have tried to retrieve data from XML file.
CODE BEHIND

protected void btnviewdata_Click(object sender, EventArgs e)
{
    GridView1.Visible = true;
    SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=TNVKP_8;Integrated Security=True");
    con.Open();
    DataSet reportData = new DataSet();
    reportData.ReadXml(Server.MapPath("XMLFILENAME.xml"));
    GridView2.DataSource = reportData;
    GridView2.DataBind();
    con.Close();
}

ASPX code

<asp:GridView ID="GridView1" runat="server" Width="96%" PageSize="10" AutoGenerateColumns="False">
                    <Columns>                               
            <asp:TemplateField HeaderText="Select">
                <ItemTemplate>
                    <asp:CheckBox ID="chkbox" runat="server"></asp:CheckBox>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="TALLY_REC_ID_CODE" HeaderText="Tally_No" />
            <asp:BoundField DataField="CLUSTER_ID" HeaderText="Cluster_ID"/>
            <asp:BoundField DataField="UNIT_TYPE" HeaderText="Unit_Type" />
            <asp:BoundField DataField="VPRC_ID" HeaderText="VPRC_ID" />
            <asp:BoundField DataField="SHG_ID" HeaderText="SHG_ID" />
            <asp:BoundField DataField="PIP_NO" HeaderText="Pip_No" />
            <asp:BoundField DataField="NAME_OF_THE_MEMBER" HeaderText="Member_Name" />
            <asp:BoundField DataField="TYPE_OF_LOAN" HeaderText="Type_of_Loan" />                  
            <asp:BoundField DataField="PRINCIPAL" HeaderText="Principal" />
            <asp:BoundField DataField="INTEREST" HeaderText="Interest" />
            <asp:TemplateField HeaderText="PipNo.">
                <ItemTemplate>
                    <asp:Label ID="PIPCODE" runat="server"></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Remark">
                <ItemTemplate>
                    <asp:Label ID="lblremark"  runat="server"></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            </Columns>
                    </asp:GridView>  

Here in this PIPCODE label I want take data from the sql server.

If XML pipno equal my table pipno then I want to retrieve the equivalent code for the pipno.

And how can I write the query to select the pipcode from the table because I want to take the pipno from XML and match with SQL then I want to select the equivalent pipcode from table and should view in the last column of grid view.
If pipcode is available then remark equal to OK, if pipno not available then remark equal to NOT IN DB like that.

Post solution for this.

Thanks in advance.