[NullReferenceException: Object reference not set to an instance of an object.] LuckyDogSystems.DataDictDownload.fnValidateInput() LuckyDogSystems.DataDictDownload.cmdDownload_Click(Object sender, EventArgs e) System.Web.UI.WebControls.Button.OnClick(EventArgs e) System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) System.Web.UI.Page.ProcessRequestMain()In fact, I even added a new commandbutton with one line of code - simply setting the visible property of a label to false. I received the same error on clicking this new button ...