FieldMergingArgsBaseRecordIndex Property

public int RecordIndex { get; }

Public ReadOnly Property RecordIndex As Integer
	Get

public:
property int RecordIndex {
	int get ();
}

member RecordIndex : int with get

public void InsertCheckBox()
{
    Document doc = new Document();
    DocumentBuilder builder = new DocumentBuilder(doc);
    builder.StartTable();
    builder.InsertCell();
    builder.InsertField(" MERGEFIELD  TableStart:StudentCourse ");
    builder.InsertCell();
    builder.InsertField(" MERGEFIELD  CourseName ");
    builder.InsertCell();
    builder.InsertField(" MERGEFIELD  TableEnd:StudentCourse ");
    builder.EndTable();

    // Add a handler for the MergeField event
    doc.MailMerge.FieldMergingCallback = new HandleMergeFieldInsertCheckBox();

    // Execute mail merge with regions
    DataTable dataTable = GetStudentCourseDataTable();
    doc.MailMerge.ExecuteWithRegions(dataTable);

    // Save resulting document with a new name
    doc.Save(ArtifactsDir + "MailMergeEvent.InsertCheckBox.doc");
}

private class HandleMergeFieldInsertCheckBox : IFieldMergingCallback
{
    /// <summary>
    /// This is called for each merge field in the document
    /// when Document.MailMerge.ExecuteWithRegions is called.
    /// </summary>
    void IFieldMergingCallback.FieldMerging(FieldMergingArgs args)
    {
        if (args.DocumentFieldName.Equals("CourseName"))
        {
            // The name of the table that we are merging can be found here
            Assert.AreEqual("StudentCourse", args.TableName);

            // Insert the checkbox for this merge field, using DocumentBuilder
            DocumentBuilder builder = new DocumentBuilder(args.Document);
            builder.MoveToMergeField(args.FieldName);
            builder.InsertCheckBox(args.DocumentFieldName + mCheckBoxCount, false, 0);

            // Get the actual value of the field
            string fieldValue = args.FieldValue.ToString();

            // In this case, for every record index 'n', the corresponding field value is "Course n"
            Assert.AreEqual(char.GetNumericValue(fieldValue[7]), args.RecordIndex);

            builder.Write(fieldValue);
            mCheckBoxCount++;
        }
    }

    void IFieldMergingCallback.ImageFieldMerging(ImageFieldMergingArgs args)
    {
        // Do nothing
    }

    /// <summary>
    /// Counter for CheckBox name generation.
    /// </summary>
    private int mCheckBoxCount;
}

/// <summary>
/// Create DataTable and fill it with data.
/// In real life this DataTable should be filled from a database.
/// </summary>
private static DataTable GetStudentCourseDataTable()
{
    DataTable dataTable = new DataTable("StudentCourse");
    dataTable.Columns.Add("CourseName");
    for (int i = 0; i < 10; i++)
    {
        DataRow datarow = dataTable.NewRow();
        dataTable.Rows.Add(datarow);
        datarow[0] = "Course " + i;
    }

    return dataTable;
}