c# - how to check all items in my RadListBox -
aspx.cs:
radlistdirectiondetail.datasource = m_listedirection;     radlistdirectiondetail.datavaluefield = "departmentid";     radlistdirectiondetail.datatextfield = "departmentname";     radlistdirectiondetail.databind();     if (radlistdirectiondetail.items.count > 0)     {          (int = 0; < radlistdirectiondetail.items.count; i++)          {               radlistdirectiondetail.items[i].checked = false;          }     } aspx:
<telerik:radajaxpanel runat="server" id="radajaxpanel2">         <telerik:radlistbox id="radlistdirectiondetail" runat="server" checkboxes="true" width="200px" showcheckall = "true"           selectionmode="multiple" autopostback="true" height="55px" skin="outlook" visible="false" enabled="false">     </telerik:radlistbox>     </telerik:radajaxpanel> 
i think problem visible , enabled properties of radlistbox both set false.
try
<telerik:radlistbox id="radlistdirectiondetail" runat="server" checkboxes="true" width="200px" showcheckall = "true"       selectionmode="multiple" autopostback="true" height="55px" skin="outlook" visible="true" enabled="true"> and
radlistdirectiondetail.items[i].checked = true;    
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