[ArgumentOutOfRangeException: 'DropDaerah' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value] System.Web.UI.WebControls.ListControl.PerformDataBinding(IEnumerable dataSource) +1610466 System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +107 System.Web.UI.WebControls.ListControl.PerformSelect() +34 System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +73 System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82 System.Web.UI.WebControls.BaseDataBoundControl.OnPreRender(EventArgs e) +22 System.Web.UI.WebControls.ListControl.OnPreRender(EventArgs e) +18 System.Web.UI.Control.PreRenderRecursiveInternal() +80 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Control.PreRenderRecursiveInternal() +171 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842