I'm working on an ASP.NET Dynamic Data Entities project with Visual Studio 2013. My data source is an ADO.NET Entity Data Model based on a SQL Server database.

When I try to insert a new table entry that violates a unique key constraint I get a quite user-unfriendly error page with the whole stack trace.
Is it possible to just display a short error message in the Insert-view? (similar to the error message when a required field is left empty)

What I tried so far is to extend the following code in *Insert.aspx.cs*

```
protected void FormView1_ItemInserted(object sender, FormViewInsertedEventArgs e) {
    if (e.Exception == null || e.ExceptionHandled) {
        Response.Redirect(table.ListActionPath);
    }
}

```

to this (checking on the unique key conflict with exception number 2627)

```
protected void FormView1_ItemInserted(object sender, FormViewInsertedEventArgs e) {
    if (e.Exception == null || e.ExceptionHandled) {
        Response.Redirect(table.ListActionPath);
    }
    else
    {
        SqlException innerException = e.Exception.InnerException as SqlException;
        if (innerException != null)
        {
            if (innerException.Number == 2627)
            {
                // Violation of unique constraint
                throw new ValidationException("Unique key violation");
            }
        }
    }
}

```

Although *Insert.aspx* uses an asp:DynamicValidator I get the the following exception:
**"ValidationException was unhandled by user code."**

Does anyone know what to do here? Thanks a lot.