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Mail Merging

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The Mail Merge functionality provided by the DevExpress ASP.NET Spreadsheet (ASPxSpreadsheet) enables you to automatically generate a set of documents based on a common template and fill each document with unique data values retrieved from a data source. This feature can be useful for a variety of business requirements, such as personalizing letters, and composing catalogs and reports.

To perform a mail merge, you need a template and a data source.

A template is a spreadsheet document that contains static information (which is the same for all resulting documents) and mail merge fields. A mail merge field is a placeholder in which a value from the specified data source field will appear in a merged document. To insert fields into template cells, use the following special functions in cell formulas: FIELD and FIELDPICTURE.

A data source contains data that will be merged into fields in a template to create merged documents.

To bind a template to a data source, use the IWorkbook.MailMergeDataSource and IWorkbook.MailMergeDataMember properties of the template workbook.

Within a template, you can choose a mail merge mode specifying how the result of the mail merge should be generated. The mail merge mode is specified programmatically at the template workbook level, by setting a specific defined name ("MAILMERGEMODE") to a particular string constant ("Worksheets" or "OneWorksheet").

  • "OneWorksheet" (Single Sheet) - Merged ranges for all data source records are inserted one after another (vertically or horizontally, depending on the document orientation) into a single worksheet. This mode is used by default.
  • "Worksheets" (Multiple Sheets) - The merged range for each data source record is inserted into a separate worksheet in a single workbook.

Note that by default, the "MAILMERGEMODE" defined name does not exist in a template workbook and the "Single Sheet" mode is used.

To finalize the mail merge process, use the IWorkbook.GenerateMailMergeDocuments method of the template workbook. This method returns a collection of resulting workbooks containing the merged documents (if the "Single Sheet" or "Multiple Sheets" mail merge mode is used, the collection contains a single workbook).

In this demo, we illustrate the merging of images along with personal information for contacts from the Northwind database's Employees table.