// Add this style definition inside the STYLE element in the Default.aspx page.
.previewer  
 {  
       border-style:dashed;
     border-color:Green;
     border-width:thick;
     font-family:Arial;
     font-style:italic;
     color:Blue;
     background-color:Yellow;
     text-align:right;
     text-decoration:'underline'|'overline'|'line-through'|'blink';
     vertical-align:bottom;
 } 


// Define the background.
FarPoint.Web.Spread.Background bg = new FarPoint.Web.Spread.Background();
bg.SelectedBackgroundImageUrl = "picture/Winter.jpg";
bg.BackgroundImageUrl = "picture/Image.bmp";
FarPoint.Web.Spread.Border bd1 = new FarPoint.Web.Spread.Border();
bd1.BorderColor = System.Drawing.Color.Blue;
bd1.BorderStyle = System.Web.UI.WebControls.BorderStyle.Dashed;

// Set the preview row properties.
FarPoint.Web.Spread.PreviewRowInfo previewRowInfo = new FarPoint.Web.Spread.PreviewRowInfo();
previewRowInfo.BackColor = Color.Blue;
previewRowInfo.Background = bg;
previewRowInfo.Border = bd1;
previewRowInfo.HorizontalAlign = System.Web.UI.WebControls.HorizontalAlign.Center;
previewRowInfo.VerticalAlign = System.Web.UI.WebControls.VerticalAlign.Middle; 
previewRowInfo.TabStop = true;
previewRowInfo.Margin.Bottom = 10;
previewRowInfo.Margin.Left = 10;
previewRowInfo.Margin.Right = 10;
previewRowInfo.Margin.Top = 10;
previewRowInfo.ForeColor = System.Drawing.Color.Green;
previewRowInfo.CssClass = "previewer";    // If set to previewer, other setting have no effect.
previewRowInfo.Font.Bold = true;
previewRowInfo.Font.Italic = true;
previewRowInfo.Font.Overline = true;
previewRowInfo.Font.Size = 20;
previewRowInfo.Font.Underline = true;
previewRowInfo.Font.Strikeout = true;
previewRowInfo.Font.Name = "Verdana";   // Try with some other name of font.
ListBox1.Items.Add(previewRowInfo.IsEmpty.ToString());
ListBox1.Items.Add(previewRowInfo.CanSerializeXml.ToString());

// Use the preview row.
FpSpread1.ActiveSheetView.PreviewRowColumnIndex = 0;
FpSpread1.ActiveSheetView.PreviewRowStyle = previewRowInfo;
FpSpread1.ActiveSheetView.PreviewRowVisible = true;