[InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid.]
Microsoft.VisualBasic.CompilerServices.Conversions.ToString(Object Value) +1113
ASP.quehacer_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) +8988
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
System.Web.UI.Page.Render(HtmlTextWriter writer) +40
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4239
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