While trying Telerik component, I got this error System.NullReferenceException - Object reference not set to an instance of an object, I struggle how to find causing this error, And somehow the solution was
From:
ddbImages.Image = ((Image)item.Tag).GetThumbnailImage(20, 20, null, new IntPtr()); ddbImages.Text = item.Text;
To:
if (item != null) { ddbImages.Image = ((Image)item.Tag).GetThumbnailImage(20, 20, null, new IntPtr()); ddbImages.Text = item.Text; }