fill text box before Grid view_RowCommand occure

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C#

ASP.NET

i have a grid view and in this grid view, after click on button the Gridview_RowCommand is called

But My problem is I want to fill a text box,
after Button click and Before Gridview_RowCommand,
and if user Blank the text box then Gridview_RowCommand is not called,


because i want to use that text box value in gridview row command,


what I do so far is:

i call a ajax_popupextender on button click,

but before opening the ajax_popupextender all Gridview_RowCommand Code is Excuted,

so what can i do ?????

And Plz Don't advice that I write the code on ajax_popupextender button click,

Because For Many condition I Call the same ajax_popupextender,


My Code is:
Pop Is:

<asp:Button runat="server" ID="FakeButton10" Text="hi" Style="display: none" />
           <asp:Panel ID="FlagIt" runat="server">

                   <div class="topBottom">
                       <table>

                           <tr>
                               <td>
                                   <asp:Label ID="lblstar" Font-Bold="true" Font-Size="20px" ForeColor="Red" runat="server"
                                       Text="*"></asp:Label>
                                   Add Description
                               </td>
                           </tr>
                           <tr>
                               <td>
                                   <asp:TextBox ID="txtDescri" CssClass="txtFinal" Height="70px" Width="200px" TextMode="MultiLine"
                                       runat="server"></asp:TextBox><asp:RequiredFieldValidator ID="RequiredFieldValidator5"
                                           runat="server" Font-Bold="true" ForeColor="Red" ControlToValidate="txtDescri"
                                           ValidationGroup="flag" ErrorMessage="***"></asp:RequiredFieldValidator>
                               </td>
                           </tr>
                           <tr>
                               <td>
                                   <asp:Button ID="BtnSubmit" runat="server" CssClass="btndesign" ValidationGroup="flag"
                                       Text="Submit" OnClick="BtnSubmit_Click"  />
                               </td>
                           </tr>
                       </table>
                   </div>

           </asp:Panel>
           <asp:ModalPopupExtender PopupControlID="FlagIt" runat="server" ID="flagitshow" TargetControlID="FakeButton10"
               CancelControlID="ImgflagClose" BackgroundCssClass="modalPopupCss" BehaviorID="flagitshow">
           </asp:ModalPopupExtender>

Row Coommnad Code is:

protected void gd_cat_RowCommand(object sender, GridViewCommandEventArgs e)
  {
      if (e.CommandName == "View_Profile")
      {

          flagitshow.Show();



          tbl_admin_myActivity m1 = new tbl_admin_myActivity();
          m1.T_id = Convert.ToInt32(Session["T_id"]);
          m1.date = DateTime.Now;
          m1.resion = txtDescri.Text;

          li.tbl_admin_myActivities.InsertOnSubmit(m1);
          li.SubmitChanges();