c# - ASP.net web page update issue ( Postback?) -

greeting of day everyone.

hoping well. need solve simple issue ( new c# + asp.net).

i have created asp.net portal. when user open portal (web page). webpage give him list of groups member of , list of group can add himself..

it contain 2 drop downs. 1 contains list of groups, use can add themselves. second 1 contains list of groups , user member of, , can remove groups.

adding , removing code working fine. have refresh page manually show updated information. after clicking add or remove button page not refreshing updated information.

i tried use redirected main page using response.redirect("success.aspx")

but nothing working,

protected void page_load(object sender, eventargs e) {     string un = "domain\\michael.jackson";     //systemresources sr = new systemresources();     //activeuser usr = sr.getuserdetails(un).firstordefault();      labelusername.text = "michael.jackson";      // getting list of groups using of praticular ou classorgunitgroup      string sdomain = classgroupportalsettings.getdomainname();     string sinterstou = "ou=testing,dc=analysys,dc=com";     classorgunitgroup = new classorgunitgroup();     list<string> allgroups = a.getgroupfromou(sdomain, sinterstou);     string grouplist = "<ul>";     foreach (string group in allgroups)     {         grouplist = grouplist + "<li><a href='showgroupmembers.aspx?group=" + group + "'>" + group + "</a></li>";      }      grouplist = grouplist + "</ul>";     lblopengroups.text = grouplist;      //// 4. finding users group membership.     string sdomain = classgroupportalsettings.getdomainname();     classusergroupmembership mymembership = new classusergroupmembership();     list<string> mygroupsmem = mymembership.getmygroupmembership(sdomain, "domain\\michael.jackson");      string gllist = "<ul>";     string openllist = "<ul>";     string othergroup = "<ul>";     foreach (string grp in mygroupsmem)     {         //bulletedlistmygroups.items.add(grp);          gllist = gllist + "<li>" + grp + "</li>";         if (allgroups.contains(grp))         {             dropdownlistmygroups.items.add(grp);             openllist = openllist + "<li>" + grp + "</li>";         }         else          {             othergroup = othergroup + "<li>" + grp + "</li>";         }     }      gllist = gllist + "</ul>";     openllist = openllist + "</ul>";     othergroup = othergroup + "</ul>";     labelothergrp.text = othergroup;     labelopengrp.text = openllist;      // labelmygroup.text = gllist;      foreach (string emailgroup in allgroups)     {         if (!mygroupsmem.contains(emailgroup))         {             dropdownlistopengroups.items.add(emailgroup);         }     }  } 

this code run when page reload.

the issue : when click on remove button or add button, run code add or remove user selected group. when page reload after clicking on button. group membership labels. , dropdown box not updating code :(

i'm assuming scenario this, you're having 2 drop down. 1 full of records , items can select. once items selected, user submit button records save database/xml. later you're retrieving items db/xml , showing in second drop down.

now you're issue records not showing in second drop down after clicking submit button,

if so, have 2 options.

1) can pull records insert things made db. 2) can pull records in page load mentioned below,

if(postback) // or if(postback == true) {   // pull records , display in drop down. }