SQLBulkCopy inserting same values in Database using C# in ASP.Net

Hello everyone,

I'm using SQLBULKCOPY for inserting records in the database but I want dynamic label id when i'm inserting. 

By default lblid i'm getting is 3 i want the dynamic id from the dataset

i am getting the dynamic value for the label id but its inserting same value of the textbox field in the database with same value

 <asp:GridView runat="server" ID="GridView2" AutoGenerateColumns="false" CssClass="table table-bordered">
            <Columns>
                <asp:TemplateField HeaderText="id" Visible="false">
                    <ItemTemplate>
                        <asp:Label runat="server" ID="lblid" Text="3" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Year" HeaderText="Year" />
                <asp:BoundField DataField="Quarter" HeaderText="Quarter" />
                <asp:TemplateField HeaderText="Value">
                    <ItemTemplate>
                        <asp:TextBox runat="server" ID="txtValue" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="uid" Visible="false">
                    <ItemTemplate>
                        <asp:Label runat="server" ID="upid" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

  protected void Button2_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[4] { new DataColumn("ID", typeof(int)),
                        new DataColumn("Year", typeof(int)),
                        new DataColumn("Quarter", typeof(string)),
                        new DataColumn("Value",typeof(string))});

            foreach (GridViewRow row in gvYearQuarter.Rows)
            {
                Label id1 = (Label)gvYearQuarter.Rows[0].Cells[0].FindControl("lblid");
                int ID = int.Parse(id1.Text);
                int Year = int.Parse(row.Cells[1].Text);
                string Quarter = row.Cells[2].Text;
                TextBox Value1 = (TextBox)gvYearQuarter.Rows[0].Cells[3].FindControl("txtValue");
                float Value = float.Parse(Value1.Text);
                //string updateid = row.Cells[4].Text;

                dt.Rows.Add(ID, Year, Quarter, Value);

            }
            if (dt.Rows.Count > 0)
            {
                string consString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
                using (SqlConnection con = new SqlConnection(consString))
                {
                    using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(con))
                    {
                        //Set the database table name
                        sqlBulkCopy.DestinationTableName = "dbo.KPI_Quaterly";

                        //[OPTIONAL]: Map the DataTable columns with that of the database table
                        sqlBulkCopy.ColumnMappings.Add("ID", "ID");
                        sqlBulkCopy.ColumnMappings.Add("Year", "Year");
                        sqlBulkCopy.ColumnMappings.Add("Quarter", "Quarter");
                        sqlBulkCopy.ColumnMappings.Add("Value", "Value");
                        //sqlBulkCopy.ColumnMappings.Add("updateid", "updateid");
                        con.Open();
                        sqlBulkCopy.WriteToServer(dt);
                        con.Close();
                    }
                }
            }
        }

Thanks