how to fill gridview from datatable in asp.net

<asp:GridView runat="server" ID="GridView1" BackColor="White"
    BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="3"
    HorizontalAlign="Center" AutoGenerateColumns="False">
     <FooterStyle BackColor="White" ForeColor="#000066" />
      <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White"
        HorizontalAlign="Center" />
    <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
    <RowStyle ForeColor="#000066" HorizontalAlign="Center" />
    <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
    
    <Columns>

  
        <asp:TemplateField HeaderText="Serial Number">
            <ItemTemplate>
                <asp:TextBox ID="txtSNo" runat="server" BackColor="AntiqueWhite"></asp:TextBox>
            </ItemTemplate>

        </asp:TemplateField>
        <asp:TemplateField HeaderText="Internal Serial Number">
            <ItemTemplate>

                <asp:TextBox ID="txtISNo" runat="server" BackColor="AntiqueWhite"></asp:TextBox>

            </ItemTemplate>
         </asp:TemplateField>
        <asp:TemplateField HeaderText="Waranty">
            <ItemTemplate>

                <asp:TextBox ID="txtWaranty" runat="server" BackColor="AntiqueWhite"></asp:TextBox>

            </ItemTemplate>

        </asp:TemplateField>
        <asp:TemplateField HeaderText="Start">

            <ItemTemplate>

                <asp:TextBox ID="txtWStart" runat="server"
                 BackColor="AntiqueWhite"></asp:TextBox>

            </ItemTemplate>

        </asp:TemplateField>

        <asp:TemplateField HeaderText="End">

            <ItemTemplate>

                 <asp:TextBox ID="txtWEnd" runat="server" BackColor="AntiqueWhite">
                 </asp:TextBox>

            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Status">
            <ItemTemplate>
                 <asp:TextBox ID="txtStatus" runat="server" BackColor="AntiqueWhite"></asp:TextBox>
            </ItemTemplate>        

        </asp:TemplateField>
        

        </Columns>
   </asp:GridView>

internal void CreateGrid(int rows,string invoice)
       {
           dt = new DataTable();
           dt.Columns.Add(new DataColumn("Serial Number", typeof(string)));
           dt.Columns.Add(new DataColumn("Internal Serial Number", typeof(string)));
           dt.Columns.Add(new DataColumn("Waranty", typeof(string)));
           dt.Columns.Add(new DataColumn("Start", typeof(string)));
           dt.Columns.Add(new DataColumn("End", typeof(string)));
           dt.Columns.Add(new DataColumn("Status", typeof(string)));
           using (cmd = new SqlCommand("sp_IPurchaseDetail", con))
           {
               cmd.CommandType = CommandType.StoredProcedure;
               cmd.Parameters.Add(new SqlParameter("@InvoiceNumber", invoice));
               cmd.Parameters.Add(new SqlParameter("@ItemCode", ""));
               cmd.Parameters.Add(new SqlParameter("@SubItemCode", ""));
               cmd.Parameters.Add(new SqlParameter("@SerialNumber", ""));
               cmd.Parameters.Add(new SqlParameter("@ISerialNumber",""));
               cmd.Parameters.Add(new SqlParameter("@Waranty", ""));
               cmd.Parameters.Add(new SqlParameter("@WarantyStartDate", ""));
               cmd.Parameters.Add(new SqlParameter("@WarantyEndDate", ""));
               cmd.Parameters.Add(new SqlParameter("@Status", ""));
               cmd.Parameters.Add(new SqlParameter("@Issued", ""));
               cmd.Parameters.Add(new SqlParameter("@StockIn",""));

               cmd.Parameters.Add(new SqlParameter("@Mode", "S"));
               if (con.State == ConnectionState.Closed)
                   con.Open();
               da = new SqlDataAdapter(cmd);
               ds = new DataSet();
               da.Fill(ds);
               if (ds.Tables[0].Rows.Count > 0)
               {
                   GridView1.AutoGenerateColumns = false;
                   for (int i = 0; i < NoOfRows; i++)
                   {
                       dr = dt.NewRow();
                       string gh = ds.Tables[0].Rows[i][3].ToString();
                       dr["Serial Number"] = ds.Tables[0].Rows[i][4].ToString();
                       dr["Internal Serial Number"] = ds.Tables[0].Rows[i][5].ToString();
                       dr["Waranty"] = ds.Tables[0].Rows[i][6].ToString();
                       dr["Start"] = ds.Tables[0].Rows[i][7].ToString();
                       dr["End"] = ds.Tables[0].Rows[i][8].ToString();
                       dr["Status"] = ds.Tables[0].Rows[i][9].ToString();
                       dt.Rows.Add(dr);

                   }

                 //  ViewState["CurrentTable"] = dt;

                   GridView1.DataSource = dt;
                   GridView1.DataBind();

               }

           }
           GridView1.Visible = true;
       }