asp.net - Eliminate explicit scrolling in a listbox -


i have list box populated via migrating items list box. have 2 asp.net buttons namely , down scroll , down through list box. maximum number of items visible @ time in list box 9, while maximum number of items 21. hence scrollbar comes eventually. pretty evident , ok. if select 21st item , click on button, 21st item moves 1 place above, list shows items first. mean list rearranged, , client has explicitly scroll down list box view 21st item has been moved above.

i want if select item , click button, view of list box should there itself, shouldn't show list box first item.

any appreciated.

below code:

    protected void btnthird_click(object sender, eventargs e)     {          if (lstboxselectedcolumns.selectedindex == 0)         {             page.clientscript.registerstartupscript(this.gettype(), "alertscrollup", "alertmessage('please select other item scroll or click down navigation button');", true);          }         else if (lstboxselectedcolumns.selectedindex > 0)         {             (int = 0; < lstboxselectedcolumns.items.count; i++)             {                 if (lstboxselectedcolumns.items[i].selected)                 {                     if (i > 0 && !lstboxselectedcolumns.items[i - 1].selected)                     {                         listitem belowitem = lstboxselectedcolumns.items[i];                         lstboxselectedcolumns.items.remove(belowitem);                         lstboxselectedcolumns.items.insert(i-1, belowitem);                         lstboxselectedcolumns.items[i - 1].selected = true;                     }                 }             }         }         else         {             page.clientscript.registerstartupscript(this.gettype(), "alertselectatleastoneitem2", "alertmessage('please select @ least 1 item scroll above');", true);         }     } 

regards

anurag


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