public void AddEx()
{
//ExStart
//ExFor:VariableCollection.Add
//ExSummary:Shows how to create document variables and add them to a document's variable collection.
Document doc = new Document(MyDir + "Document.doc");
doc.Variables.Add("doc", "Word processing document");
doc.Variables.Add("docx", "Word processing document");
doc.Variables.Add("txt", "Word processing document");
// Duplicate values can be stored but adding a duplicate name overwrites the old one.
doc.Variables.Add("txt", "Plain text file");
doc.Variables.Add("bmp", "Image");
doc.Variables.Add("png", "Image");
//ExEnd
}