[Solved] TextBox Value is showing Empty if ASP.Net GridView BoundField column Visible set to false

Dear Sir,

I am facing a problem. my 

<asp:BoundField DataField="Country" HeaderText="Country" Visible="false" />

is not showing value in TextBox

Please help me to how to show value in textbox of visible=false filed.

<%-- Start Parts List for parts and labour --%>
<div class="container p-0 mb-0 mt-0">
    <asp:Panel ID="Panel1" runat="server">
        <div class="row p-0 g-0 bg-primary ">
            <div class="col col-12 h-50 bg-primary  text-center fs-6 text-white">
                Parts Supplied
            </div>
        </div>
        <div class="col col-12  text-black justify-content-center">
            <asp:GridView ID="GridView1" runat="server"
                GridLines="Both"
                EmptyDataText="No Record Found"
                EmptyDataRowStyle-ForeColor="Red"
                EmptyDataRowStyle-Font-Bold="true"
                EmptyDataRowStyle-BorderStyle="None"
                CssClass="MyPartAndLabourDataGridViewListOne"
                HorizontalAlign="Center"
                AllowSorting="true" AutoPostBack="true"
                AutoGenerateColumns="false">
                <EmptyDataRowStyle BorderStyle="None" Font-Bold="True" ForeColor="Red"></EmptyDataRowStyle>
                <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                <HeaderStyle BackColor="Blue" Font-Names="Arial" Font-Size="12px" Font-Bold="True" ForeColor="Blue" />
                <RowStyle CssClass="rows Fs-12-User"></RowStyle>
                <Columns>
                    <asp:TemplateField HeaderText="Sr.No" ItemStyle-Width="20px" ItemStyle-HorizontalAlign="Left">
                        <ItemTemplate>
                            <asp:Label ID="lblRowNumber" Text='<%# Container.DataItemIndex + 1 %>' runat="server" />
                        </ItemTemplate>
                        <ItemStyle HorizontalAlign="Left" Width="30px" />
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Select">
                        <HeaderTemplate>
                            <asp:CheckBox ID="HeaderCheckBoxPartsPl" AutoPostBack="true"
                                runat="server" />
                        </HeaderTemplate>
                        <ItemTemplate>
                            <asp:CheckBox ID="CheckedPartsPl" runat="server" AutoPostBack="true" />
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="Id" HeaderText="Customer Id" />
                    <asp:BoundField DataField="Name" HeaderText="Customer Name" />
                    <asp:BoundField DataField="Country" HeaderText="Country" Visible="false" />
                    <asp:BoundField DataField="Salary" HeaderText="Salary" Visible="false" />
                    <asp:BoundField DataField="Dist" HeaderText="Dist" />
                </Columns>
            </asp:GridView>
        </div>
        <br />
    </asp:Panel>
</div>
<%-- End Parts List for parts and labour --%>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
<br />
<asp:TextBox ID="TextBox1" Text="" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox2" Text="" runat="server"></asp:TextBox>

protected void Page_Load(object sender, EventArgs e)
{
	if (!this.IsPostBack)
	{
		this.PopulateGridView();
	}
}

private void PopulateGridView()
{
	DataTable dt = new DataTable();
	dt.Columns.AddRange(new DataColumn[5] {
			new DataColumn("Id"),
			new DataColumn("Name"),
			new DataColumn("Country"),
			new DataColumn("Salary"),
			new DataColumn("Dist")
	});
	dt.Rows.Add(1, "John Hammond", "United States", 70000, "MZN");
	dt.Rows.Add(2, "Mudassar Khan", "India", 40000, "MRT");
	dt.Rows.Add(3, "Suzanne Mathews", "France", 30000, "Sre");
	dt.Rows.Add(4, "Robert Schidner", "Russia", 50000, "SML");
	GridView1.DataSource = dt;
	GridView1.DataBind();
}

protected void Button1_Click(object sender, EventArgs e)
{
	foreach (GridViewRow row in GridView1.Rows)
	{
		CheckBox chckrw = (CheckBox)row.FindControl("CheckedPartsPl");
		if (chckrw.Checked)
		{
			TextBox1.Text = row.Cells[3].Text;
			TextBox2.Text = row.Cells[4].Text;
		}
	}
}