Gridview Data From TextBox

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C#

ASP.NET

Hello,
I have a Gridview GDAddBooking. and few Temp filed with Textboxes. I have another textbox outside the Gridview.
Now I want to Add gridview Rows Dynamically depends on the value of the Textbox.
How can it be possible?

<asp:GridView ID="GDAddBooking" runat="server" align="center" AllowPaging="True"
                           AutoGenerateColumns="false" CellPadding="4" ShowHeaderWhenEmpty="true">
                          <Columns>
                              <asp:TemplateField HeaderText="Project ID">
                                  <ItemTemplate>
                                      <asp:TextBox ID="txtProjectID" runat="server"></asp:TextBox>
                                  </ItemTemplate>
                              </asp:TemplateField>
                              <asp:TemplateField HeaderText="Booking 1">
                                  <ItemTemplate>
                                      <asp:TextBox ID="txtBooking1" runat="server"></asp:TextBox>
                                  </ItemTemplate>

                              </asp:TemplateField>
                              <asp:TemplateField HeaderText="Booking 2">
                                  <ItemTemplate>
                                      <asp:TextBox ID="txtBooking2" runat="server"></asp:TextBox>
                                  </ItemTemplate>

                              </asp:TemplateField>
                              <asp:TemplateField HeaderText="Booking 3">
                                  <ItemTemplate>
                                      <asp:TextBox ID="txtBooking3" runat="server"></asp:TextBox>
                                  </ItemTemplate>

                              </asp:TemplateField>
                          </Columns>
                       </asp:GridView>