Hi Carsten,
Thank you for contacting Syncfusion support.
We have checked your sample; it seems that you have done namespace changes only in the import.ashx.cs file. We request you to change the namespace in the import.ashx file also. Kindly have a look at the following code example.
[Import.ashx File]
<%@ WebHandler Language="C#" CodeBehind="Import.ashx.cs" Class="DocumentExample.Import"%> |
Refer to the following screenshot:
Regards,
Prince