The "Alternating background" feature of FlexReport lets you demonstrate how to change the background color of alternate rows in a section of report.

By default, rows in the details section of a report have the same background color. However, the background color of the alternate rows can be set to enhance the readability of the records in a report. You can set the background color of the alternating rows in the detail section using its OnFormat event.

In this report, the background color is applied to the alternate rows of Detail section on the basis of the script added to it's OnFormat property. The background color of the odd numbered rows is set to white and the even numbered rows is set to a linear gradient using StartColor and EndColor values. 

To create a report with alternating background, perform the steps below:

Step 1: Create a report

1. Open the FlexReportDesigner and go to FILE | New.
2. Click New Report drop down from the Reports tab and select Empty Report to create a report.

Step 2: Connect the report to a data source

1. Switch to the Data tab, right-click the Main data source and choose Edit to open and the Data Sources Wizard and start editing.
2. Select OLEDB Data Provider from the Data provider drop-down and click the ellipsis button next to the Connection string textbox to select the C1NWind.mdb file.
3. Specify the following Sql statement in the Sql statement tab:
   

   SELECT Categories.*, Products.*
   FROM Categories INNER JOIN Products
   ON Categories.CategoryID = Products.CategoryID
   

Step 3: Add background color to alternate rows

1. Click Groups in Home tab and add a group named CategoryName.
2. In the Groups wizard, set the following properties for the CategoryName group:
   

   Property	Value
   GroupBy	CategoryName
   Keep Together	KeepFirstDetail
   Sort	Ascending
   ShowGroupFooter	True
   ShowGroupHeader	True
   OutlineLabel	=CategoryName

3. Click OK to close the Groups wizard.
4. Right-click CategoryName_Header group and select Add SubSection from the context menu.
5. Add two SubSections to the group header.
6. In CategoryName_Header/<B> subsection, add one ImageField and two TextFields and set the following properties:
   

   Property	Value
   Image.Picture	Picture
   Image.PictureAlign	Scale
   Image.PictureScale	Scale
   TextField1.Text	=CategoryName
   TextField2.Text	=Description

7. In CategoryName_Header/<C> subsection, add five TextFields, Product Name, Quantity Per Unit, Unit Price, In Stock, On Order.
8. In the Details section, add five TextFields corresponding to the TextFields in CategoryName_Header/<C>, and set the following properties:

   Property	Value
   TextField8.Text	=ProductName
   TextField9.Text	=QuantityPerUnit
   TextField10.Text	=UnitPrice
   TextField11.Text	=UnitsInStock
   TextField12.Text	=UnitsOnOrder

9. Select the report from the drop-down list on the top of the Properties window.
10. Go to the OnOpen property of the report and enter cnt = 0. This initializes the 'cnt' variable.
11. Select Detail section from the drop-down list above the Properties window or from the design area.
12. Go to the OnFormat property and then click the ellipsis button. In the VBScript Editor, enter the following expression in the editor and click Done. Here, "cnt" checks if the row is even or odd.

    cnt = cnt + 1
    if cnt mod 2 = 0 then
      Detail.Background.StartColor = Rgb(238, 214, 200)
      Detail.Background.EndColor = Rgb(238, 200, 177)
    else
      Detail.Background.StartColor = vbWhite
      Detail.Background.EndColor = vbWhite
    endif
    

Step 4: View the report

Preview the report with alternating background.