[ArgumentOutOfRangeException: 'DropDownList_Corsi' 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) +2751548
System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +303
System.Web.UI.WebControls.ListControl.PerformSelect() +38
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +76
_171._171_Init(Object sender, EventArgs e) in C:\inetpub\wwwroot\IdeaVerona\PagineWeb\1\_171.aspx.vb:79
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.Control.OnInit(EventArgs e) +97
System.Web.UI.Page.OnInit(EventArgs e) +14
System.Web.UI.Control.InitRecursive(Control namingContainer) +142
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +416
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