BOOTSTRAP MODALPOPUP(когда я передаю значение в текстовое поле в bootstrao modal popup , всплывающее окно загружается, но текстовое поле не заполняется)

---

ЭТО МОЙ ПЕРЕДНИЙ КОНЕЦ

<%@ Page Title="" Language="C#" MasterPageFile="~/Main.master" AutoEventWireup="true" CodeFile="Category.aspx.cs" Inherits="Category" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
     <asp:Label ID="lblCID" runat="server" Text="" Visible="false">
   
    
       Add New Category
    
        function openModal()
        {
            $('#modal-header-primary').modal('show');
            
        }
    

    <%--Modal popup start--%>
     <div id="modal-header-primary" class="modal fade">
                    <div class="modal-dialog">
                        <div class="modal-content">
                            <div class="modal-header modal-header-primary">
                                ×
                                <h4 id="modal-header-primary-label" class="modal-title">Add New Category</h4>

                            </div>
                            <div class="modal-body">
                                  <div class="col-md-6">
                                                <div class="form-group">
                                                    <div class="input-icon">
                                                        
                                                        <asp:TextBox ID="txtCategoryName"  runat="server" class="form-control" data-toggle="tooltip">
                                                    </div>
                                                </div>
                                            </div>

                            </div>
                            <br>
                            <div class="modal-footer">
                                 
                                Close
                                <asp:Button ID="btnCategory" runat="server" Text="Submit" OnClick="btnCategory_Click" class="btn btn-primary"/>
                                
                            </div>
                        </div>
                    </div>
                </div>
    <%--Modal popup end--%>

    <%--Grid View start--%>
    <asp:ScriptManager ID="ScriptManager1" runat="server"

        EnablePageMethods="true">
    
          
      <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                  <triggers>

<asp:AsyncPostBackTrigger ControlID="GVCategoryDetails" EventName="RowCommand" />


        <contenttemplate>
    
     <div class="row">
   
          
         </div>
    <div class="col-lg-12">

        <div class="row">
            <asp:Label ID="lblID" runat="server" Text="lblID" Visible="false">
            <asp:Label ID="lblMsg" runat="server" Text="" ForeColor="Red" Visible="false">

            <div class="panel panel-red">
                            <div class="panel-heading">Category Details</div>
                            <div class="panel-body">
            <asp:GridView ID="GVCategoryDetails" runat="server" CssClass="table table-hover table-bordered" PagerStyle-CssClass="pager"

                HeaderStyle-CssClass="header" RowStyle-CssClass="rows" AllowPaging="True" OnPageIndexChanging="GVCategoryDetails_PageIndexChanging"

                AutoGenerateColumns="false" OnRowDeleting="GVCategoryDetails_RowDeleting" 

                OnRowCommand="GVCategoryDetails_RowCommand" DataKeyNames="CategoryId"  PageSize="25">

                <columns>
                    <asp:TemplateField HeaderText="Sl.No.">
                        <itemtemplate>
                            <%#Container.DataItemIndex+1 %>
                        
                    
                  

                    <asp:BoundField HeaderText="CategoryId" DataField="CategoryId" Visible="false"

                        ItemStyle-HorizontalAlign="Justify">

                        <ItemStyle HorizontalAlign="Justify">
                    

                    <asp:BoundField HeaderText="Category Name" DataField="CategoryName"

                        ItemStyle-HorizontalAlign="Justify">

                        <ItemStyle HorizontalAlign="Justify">
                    

              
                    <asp:TemplateField HeaderText="Manage">

                        <itemtemplate>



                            <asp:ImageButton ID="ImgView" runat="server" CausesValidation="False" CommandName="ViewPopup" ToolTip="Click here to view " ImageAlign="Middle" ImageUrl="~//images/view.png" />    
                            <asp:ImageButton ID="ImgEdit" runat="server" CausesValidation="False" CommandName="Edit" ToolTip="Click here to edit " ImageAlign="Middle" ImageUrl="~/images/edit.png" />    
                            <asp:ImageButton ID="ImgDelete" runat="server" CausesValidation="False" CommandName="Delete" ToolTip="Click here to delete" ImageAlign="Middle" ImageUrl="~/images/delet.png" />



                        
                    


                
            
                                </div>

        </div>
    </div>
        </div>
            
          
    <%--GridView end--%>

КОД C#

protected void GVCategoryDetails_RowCommand(object sender, GridViewCommandEventArgs e)
   {
       if (e.CommandName == "ViewPopup")
       {
           ImageButton ImgView = (ImageButton)e.CommandSource;
           GridViewRow row = (GridViewRow)ImgView.Parent.Parent;
           int CategoryId = Convert.ToInt32(GVCategoryDetails.DataKeys[row.RowIndex].Value);
           DataTable dtCategory= _objMainBL.GetCategoryDetailsbyId(CategoryId);

           if (dtCategory!= null && dtCategory.Rows.Count > 0)
           {
             txtCategoryName.Text = dtCategory.Rows[0]["CategoryName"].ToString();
           lblCID.Text = dtCategory.Rows[0]["CategoryId"].ToString();
           ScriptManager.RegisterStartupScript(this, this.GetType(), "Pop", "openModal();", true);

           }


       }
   }

Что я уже пробовал:

Мне нужно отобразить значение в текстовом поле

---