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Newbie mail merge query

I have got my mail merge query working OK - But what I would like to do is if a field has a certain value in I want to insert a few lines of text instead of the value on tha data table.
Can any one let me know if this can be done and how I would do it?

Thanks for your inquiry. I think you can use MergeField event handler in this case. See the following link for more information:
Also see the following code:

public void Test187()
    string[] names = { "field1", "field2", "field3" };
    object[] values = { "value1", "value1", "replace" };
    // Open template
    Document doc = new Document(@"Test187\in.doc");
    // Add MergeField event handler
    doc.MailMerge.MergeField += new MergeFieldEventHandler(MailMerge_MergeField_ReplaceValue);
    // Execute mail merge
    doc.MailMerge.Execute(names, values);
    // Save output document
void MailMerge_MergeField_ReplaceValue(object sender, MergeFieldEventArgs e)
    if (e.FieldValue.Equals("replace"))
        DocumentBuilder builder = new DocumentBuilder(e.Document);
        // Move document builder cursor to mergefield
        // Insert some text
        builder.Write("Hello from MergeField event handler!");

Hope this helps.
Best regards.