SourceText Property
The source text for the merge process.
property SourceText: string;
Description
Set the SourceText property before calling the Merge method to tell the component you want to merge the text contained in the SourceText property.
Example
DataMerge.SourceText := memo1.text;
DataMerge.MergeResult := msString;
DataMerge.Merge;
memo1.text := DataMerge.ResultText;