c# - Add a user row to an existing grid or table on button click -

i have created page has 1 gridview , 1 form. gridview working properly. form has textbox user name or email address , submit button. form working properly.

below form, need create table or grid store each user name , email added. how can create table in such way 1 line added each btnsenduser_onclick event? table must not delete rows inserted previously. table shows 1 row (the recent).

my aspx

<asp:gridview id="gridview" runat="server" autogeneratecolumns="false" gridlines="none"         cssclass="table table-bordered table-striped">         <columns>             <asp:boundfield datafield="accessgroup" headertext="access group" />             </asp:templatefield>             <asp:templatefield headertext="business justification">                 <itemtemplate>                     <asp:textbox id="txtjustbuss" runat="server" height="17px" width="150px"></asp:textbox>                 </itemtemplate>             </asp:templatefield>         </columns>     </asp:gridview>     <asp:label id="lbluseradd" runat="server" font-bold="true" text="add user - (email or user name)"></asp:label>     <br />     <asp:textbox id="txtuseradd" runat="server" height="17px" width="150px"></asp:textbox>     <asp:label id="lblerror" runat="server" class="control-label" for="inputerror" visible="false">input error</asp:label>     <asp:button id="btnadduser" class="btn" runat="server" font-bold="true" text="add user"         onclick="btnsenduser_onclick" />     <br />     <br />     <table id="tblusers" class="table table-bordered table-striped" runat="server" visible="false">         <tbody>             <tr>                 <td>                     <asp:label id="lbluser" runat="server" visible="false"></asp:label>                 </td>                 <td>                     <asp:label id="lblemail" runat="server" visible="false"></asp:label>                 </td>             </tr>         </tbody>     </table> 

my .cs

protected void btnsenduser_onclick(object sender, eventargs e) {     string logininfo = txtuseradd.text;     principalcontext insprincipalcontext = new principalcontext(contexttype.domain, "x.com", "amsuser", "xx");     userprincipal insuserprincipal = userprincipal.findbyidentity(insprincipalcontext, logininfo);      if (insuserprincipal == null)     {         lblerror.visible = true;     }      else     {         tblusers.visible = true;         lbluser.visible = true;         lblemail.visible = true;         lbluser.text = insuserprincipal.givenname + " " + insuserprincipal.surname;         lblemail.text = insuserprincipal.emailaddress;     } } 

you should use component designed deal collection of values - example grid.

if heavy, can update labels this:

lbluser.text = lbluser.text               + insuserprincipal.givenname + " " + insuserprincipal.surname              + "<br />"; lblemail.text = lblemail.text               + insuserprincipal.emailaddress               + "<br />";