Hi,

i'm using a WHDG to update rows in the database (aspx file is attached).

When the database update is executed this exception occurs:

[SqlException (0x80131904): Die implizite Konvertierung vom sql_variant-Datentyp in uniqueidentifier ist nicht zulässig. Verwenden Sie die CONVERT-Funktion, um diese Abfrage auszuführen.]
   Infragistics.Web.UI.GridControls.GridBot.LoadAdditionalClientState(Object state) +673
   Infragistics.Web.UI.GridControls.ContainerGridBot.LoadAdditionalClientState(Object state) +1497
   Infragistics.Web.UI.Framework.RunBot.HandleRaisePostDataChangedEvent() +202
   Infragistics.Web.UI.GridControls.GridBot.HandleRaisePostDataChangedEvent() +73
   Infragistics.Web.UI.GridControls.ContainerGrid.RaisePostDataChangedEvent() +91
   System.Web.UI.Page.RaiseChangedEvents() +165
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1485

Translated: implicit convertion from sql_variant to uniqueidentifier is not allowed

The table contains a guid column. The value is filled in the RowAdding Event:

    void WebHierarchicalDataGrid1_RowAdding(object sender, Infragistics.Web.UI.GridControls.RowAddingEventArgs e)
    {
            Guid userid = Utils.Data.Convert2Guid(this.Request.QueryString["UserID"]);
           e.Values[AuctionStudio.Web.DAL.SQL.HelperClasses.ApsUserHistoryFields.ApsUserID.Name] = userid.ToString();
    }

What's wrong?

Thanks,

Anton