c# - how to check all items in my RadListBox -

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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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