[Solved] jQuery Modal popup not opening on ASP.Net Button Click

On button click modal popup fails to appear, but the linkbutton works perfectly well.

Please help

<asp:GridView ID="gvDetails" runat="server" AutoGenerateColumns="False"
    BackColor="White" BorderColor="#3366CC" BorderStyle="None"
    Font-Names="Century Gothic" Font-Size="x-Small" DataKeyNames="id"
    Width="100%" Style="margin-bottom: 0px" CssClass="grid">
    <Columns>                                                                                                                                                                           
         <asp:TemplateField>
              <ItemTemplate>
                  <asp:HiddenField ID="id" runat="server" Value='<%#Eval("id") %>' />
              </ItemTemplate>
         </asp:TemplateField>                                          
         <asp:BoundField DataField="embid" HeaderText="Emb.Id" />
         <asp:BoundField DataField="type" HeaderText="Type" />
         <asp:BoundField DataField="circfemale" HeaderText="Emb Cir.Fem" />
         <asp:BoundField DataField="circmale" HeaderText="Emb Cir.Male" />
         <asp:BoundField DataField="diameter" HeaderText="Diameter" />
         <asp:BoundField DataField="artworkdate" HeaderText="Artworkdate" />
         <asp:BoundField DataField="supplier" HeaderText="Supplier" />                                       
         <asp:BoundField DataField="comment" HeaderText="Comment" />
         <asp:BoundField DataField="ppid" HeaderText="Job Used" />
         <asp:TemplateField>
             <ItemTemplate>
                 <asp:Button Text="View" ID="Inkview" runat="server" OnClick="Inkview_Click" ForeColor="#FF9900" />
             </ItemTemplate>
         </asp:TemplateField>
         <asp:TemplateField>
             <ItemTemplate>
                 <asp:LinkButton Text="Edit" ID="lnkView1" runat="server" OnClick="Preview1" ForeColor="#FF9900" />
             </ItemTemplate>
         </asp:TemplateField>                                              
     </Columns>
 </asp:GridView>

//for get record
protected void Inkview_Click(object sender, EventArgs e)
{
    MainView.ActiveViewIndex = 0;
    Tab6.CssClass = "Clicked";
  
    gvDetails.UseAccessibleHeader = true;
    gvDetails.HeaderRow.TableSection = TableRowSection.TableHeader;
    ScriptManager.RegisterStartupScript((sender as Control), this.GetType(), "Popup", "ShowPopup();", true);
 
    int rowIndex = ((sender as LinkButton).NamingContainer as GridViewRow).RowIndex;
    int lbl1 = Convert.ToInt32(gvDetails.DataKeys[rowIndex].Values[0]);
    SqlConnection con = new SqlConnection("data source=NEW\\SPRESS01; Initial Catalog=Deliver;Integrated Security=True;");
    SqlCommand cm = new SqlCommand();
    cm.Connection = con;
    con.Open();
    cm.CommandType = CommandType.Text;
    cm.CommandText = "SELECT ppid FROM job_emboss WHERE id=@id ";
    cm.Parameters.AddWithValue("@id", lbl1);
    TextBox393.Text = Convert.ToString(cm.ExecuteScalar());
 
    con.Close();
}